{"id":9454,"date":"2021-07-18T11:46:43","date_gmt":"2021-07-18T11:46:43","guid":{"rendered":"https:\/\/www.monsterindia.com\/career-advice\/40-operating-systems-interview-questions-answers-9454\/"},"modified":"2024-04-17T13:32:29","modified_gmt":"2024-04-17T08:02:29","slug":"40-operating-systems-interview-questions-answers","status":"publish","type":"post","link":"https:\/\/www.foundit.sg\/career-advice\/40-operating-systems-interview-questions-answers\/","title":{"rendered":"40 Operating Systems Interview Questions &#038; Answers"},"content":{"rendered":"\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">OS (operating system) is a <a href=\"https:\/\/www.monsterindia.com\/search\/software-jobs\" title=\"https:\/\/www.monsterindia.com\/search\/software-jobs\">software <\/a>application responsible for managing and handling every single resource of a computer, including software and hardware. The very first OS, known as GMOs, had been introduced in the 50s. An OS manages, handles, and coordinates the overall activities as well as sharing of the resources of the computer. It functions as an intermediary amongst the computer hardware and computer users.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>Functions of an <\/strong><strong>operating system (OS) software program<\/strong><\/span><\/h2>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The OS comes with lots of functions, and below, we have mentioned some notable ones:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Processor and memory management<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Device management and file management<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Offering user interface to users<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Detection of errors<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\"><a href=\"https:\/\/www.monsterindia.com\/search\/security-jobs\" title=\"https:\/\/www.monsterindia.com\/search\/security-jobs\">Security<\/a><\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Scheduling of jobs and resources<\/span><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\">Top 40 Operating System interview questions and answers<\/span><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>For what reason is OS important?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">This happens to be the most vital <\/span>OS interview questions<span style=\"font-weight: 400\"> out there. The operating system happens to be the most vital component of a computer. The purpose of the operating system will be to control the computer and all its functions. Without an OS, the computer is considered to be useless. Apart from enabling an interface, it functions as a link between computer applications that have been installed on users and OS. Apart from this, it likewise aids in communicating with hardware while maintaining a balance between CPU and hardware. It likewise offers services to users plus a platform for applications to operate. It is accountable for performing all the common tasks required by the computer.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What happens to be the primary purpose of an operating system? Mention the various types of operating systems?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">In case you are considering the typical <\/span><strong>OS interview questions<\/strong><span style=\"font-weight: 400\">, then this one is definitely one of them. An <a href=\"https:\/\/www.monsterindia.com\/career-advice\/commonly-asked-operating-system-interview-questions\/\" title=\"https:\/\/www.monsterindia.com\/career-advice\/commonly-asked-operating-system-interview-questions\/\">operating system <\/a>(OS) software program&#8217;s primary purpose will be to execute the user&#8217;s program and make it simpler for them to comprehend, plus interact with computers and run applications. It has been explicitly designed to ensure that the computer performs in the best possible way by managing all the computer activities. It likewise manages the memory of the computer, apart from operating all the software and hardware.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Types of operating system<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Batched OS (for example, Transactions Process, Payroll System, and so forth)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Time Sharing OS (for example, Multics, and so on)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Multi programmed OS (for example, UNIX O\/S, Windows O\/S, and so forth)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Distributed OS (for example, LOCUS, and so on)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Real-time OS (VRTX, PSOS, and so forth)<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What are the advantages provided by a multiprocessor system?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">The benefits provided by a multiprocessor system are also amongst the most notable <\/span>OS interview questions<span style=\"font-weight: 400\">. By the term multiprocessor system, we refer to a kind of system which consists of more than 2 CPUs. It will involve the processing of various computer programs simultaneously, mainly by a computer system having more than 2 CPUs sharing a single memory.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>Advantages<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">These systems are employed widely at present to enhance the performance in systems operating more than one program simultaneously. It is feasible to accomplish an increasing number of jobs in unit time by increasing the processor numbers.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">One likewise gets a significant increase in throughput, plus it happens to be cost-effective as well since every single processor will be sharing identical resources. It enhances the computer system&#8217;s reliability in the long run.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What do you mean by RAID structure? What are the various RAID configuration levels?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">This query will surely find a place amongst the top <\/span>operating systems interview questions<span style=\"font-weight: 400\">. Redundant Arrays of Independent Disks or RAID happens to be a process that is utilized for storing information on several hard disks. Consequently, one can consider it to be an information storage visualization process that combines several hard disks. It is known to balance system performance, data protection, storage space, and so on. It likewise helps to enhance the overall performance as well as dependability of data storage. It likewise increases the system&#8217;s storage capacity while its primary objective will be to attain data redundancy for minimizing loss of data.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Different RAID levels<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">At present, you will come across RAID in different schemes, which have been mentioned below:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAID 0 &#8211; This level is employed for increasing the server\u2019s performance.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAID 1 &#8211; This level is likewise referred to as disk mirroring, which is thought to be the easiest way of implementing fault tolerance.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAID 2 &#8211; This level usually makes use of committed hamming code parity, which is a liner type of error correction code.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAID 3 &#8211; This level needs a committed parity drive for storing parity info.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAID 4 &#8211; Even though this level is identical to RAID 5, the main difference happens to be the fact that it confines parity information to one single drive.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAID 5 &#8211; This level offers superior performance as compared to fault tolerance and disk mirroring.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAID 6 &#8211; This particular level usually offers fault tolerance for a couple of drive failures.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How does NTFS handle data structures, and how can it make a recovery from a crash?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">In case you are searching for the most typical <\/span>operating systems interview questions<span style=\"font-weight: 400\">, then this one will not disappoint you whatsoever. All the updates of the data structure will be performed in an NTFS system. Before altering a data structure, a log record consisting of info on redo as well as undo functions will be created by a transaction. After the completion of a transaction, commit record info will be stored within the logs.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is possible for an NTFS system to recover from a crash simply by accessing info from the log records that have been created. The initial step will be to redo the operations of the transactions which have been committed and undo those that cannot be committed successfully. Even though after recovering from a crash, the NTFS file system might not show identical user data before the crash, it will assure that no damage will be caused to the file data structures. The structure is restored to a consistent state eventually.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What are the advantages and drawbacks of systems that support multiple file structures and systems which support a stream of bytes?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">During an operating system <a href=\"https:\/\/www.foundit.sg\/career-advice\/commonly-asked-operating-system-interview-questions\/\" target=\"_blank\" rel=\"noopener\" title=\"\">job interview<\/a>, you can always expect this particular question. The primary benefit of having a system supporting more than one file structure will be that the system will provide its support on its own. No other application will be needed to provide structural support. It is the system that provides the support, and therefore, the implementation happens to be more effective, unlike the application level.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">One drawback of this type of implementation happens because the system&#8217;s overall size can be increased by it. Moreover, the system will be providing the support, and therefore, an application requiring a different type of file might not be executable on this type of system.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">A proper alternative for this will be that no support will be provided by the OS for file structures, and instead, every single file will be considered a sequence of bytes. In this way, the support provided to the systems will be simplified since it is not imperative for the OS to specify various structures for the files systems. In this way, the applications will be able to define file structures. One can find this type of implementation in UNIX.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How can you differentiate <span style=\"font-weight: 400\">preemptive and non-preemptive scheduling<\/span>?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">This particular question falls under one of the most important <\/span>OS interview questions<span style=\"font-weight: 400\"> at present. It is possible to divide scheduling into a couple of categories, namely, preemptive scheduling and non-preemptive scheduling.<\/span><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In preemptive scheduling, the process is going to remain in the CPU until it is completely executed. In case there is an innovative procedure that comes with top priority, the ongoing process of CPU must stop. On the other hand, in non-preemptive scheduling, the priority of the procedure does not have any significance. It is imperative for the new procedure to wait until execution is finished by the initial process.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">There will be a constant switching between the ready and running states of the procedures in preemptive scheduling. However, this is not true in non-preemptive scheduling.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The process will be scheduled by preemptive according to their priority. On the contrary, the process burst time will be used non-preemptive.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In preemptive scheduling, it is highly probable for the procedure with less priority to starve. However, in the case of non-preemptive scheduling, the procedure having less burst time is going to starve.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How to differentiate between physical and logical addresses?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Logical address is generated by the CPU. On the other hand, the physical address is the program&#8217;s actual address in the memory.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is possible for a user to gain access to the program\u2019s logical address. However, it is feasible to address the physical address directly.&nbsp;<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">A logical address is generated by the CPU at the time of execution. A physical address is generated by the MMU (Memory Management Unit) at the time of creation.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What is meant by demand paging?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">The definition of demand paging is likewise one of the most important <\/span><strong>OS interview questions<\/strong><span style=\"font-weight: 400\">. It is a process for loading pages into the memory if required. On most occasions, this process is employed in virtual memory. During this, a page will be brought into memory once that particular page\u2019s location has been referenced at the time of execution. The subsequent steps are usually followed:<\/span><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Try to gain access to the page.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Go on processing instructions as normal in case the page happens to be valid.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">A page-fault trap will be taking place in case a page is not valid.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Verify whether the memory reference is valid to any location on the secondary memory. Otherwise, the page will be terminated. Or else, it will be imperative to page in the required page.&nbsp;<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Disk operation has to be scheduled for reading the page into the main memory.&nbsp;<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Start the instruction once again, which the operating system trap interrupted.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What is meant by the term \u201cRTOS\u201d?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RTOS (Real-Time Operating System) is an OS utilized for real-time apps, i.e., for those apps where it is essential to perform data processing within a fixed and small amount of time. It will be performing significantly better on jobs that have to be executed quickly. It likewise handles execution, monitoring, as well as all-controlling procedures. Besides this, it consumes less memory plus fewer resources.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RTOS types<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Firm Real-Time<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Hard Real-Time<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Soft Real-Time<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">We make use of RTOS in anti-lock brake systems, air traffic control systems, plus heart pacemakers.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How is it possible to discriminate between process and program?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">The difference between process and program is likewise amongst the most notable <\/span>OS interview questions<span style=\"font-weight: 400\"> out there.<\/span><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">A program is some instructions that have been created using a programming language. A process is a program&#8217;s instance that will be executed using one or more threads.&nbsp;<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">A program happens to be static. On the other hand, a process is generated at the time of execution and is dynamic.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Programs are portable since they are usually stored in the secondary memory. However, processes reside within the primary memory and are not portable.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is possible for the program to stay for eternity in the main memory. The time period of a process is limited, and it will either execute or fail.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">While programs happen to be passive entities; processes are active.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What do you mean by IPC? What are the various mechanisms of IPC?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">In case you are considering the most crucial <\/span>OS interview questions<span style=\"font-weight: 400\">, you should not ignore this one by any means. Interprocess Communication or IPC is a mechanism that needs resources such as a memory that will be shared between threads or processes. With IPC, various processes are allowed by OS for communicating with one another. It is utilized for exchanging info between a number of threads in several processes or programs. In this mechanism, it is feasible for different processes to communicate with one another with the OS&#8217;s approval.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Various IPC mechanisms<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Message Queuing<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Pipes<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Semaphores<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Shared memory<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Socket<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Signals<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What is the difference between secondary memory and main memory?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">RAM happens to be the main memory of a computer. One can also refer to it as read-right memory, internal memory, or primary memory. The data and programs needed by the CPU while executing a program are stored in the primary memory.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">On the other hand, a <a href=\"https:\/\/www.monsterindia.com\/search\/computer-jobs\" title=\"https:\/\/www.monsterindia.com\/search\/computer-jobs\">computer\u2019s <\/a>secondary memory is a storage device capable of storing programs and data. It is likewise referred to as additional memory, backup memory, auxiliary memory, or external memory. These types of storage devices will be able to store high-volume data. These storage devices can be USB flash drives, CDs, hard drives, and so on.<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In the case of primary memory, the processing unit will be able to access data directly. On the other hand, in the case of secondary memory, information will be transmitted to the main memory and, following this, transferred to the processing unit.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Primary memory can be volatile as well as nonvolatile. Secondary memory happens to be nonvolatile.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">As compared to secondary memory, primary memory is more expensive. Nevertheless, secondary memory is less costly as compared to primary memory.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Primary memory happens to be temporary since information will be stored for a short time. Secondary memory is permanent since information will be stored forever.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In the case of primary memory, it is possible to lose data in the event of a power failure. In the case of secondary memory, it is not possible to lose information since it will be stored permanently.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">As compared to secondary memory, primary memory is much faster and is able to save information presently utilized by the computer. Unlike primary memory, secondary memory is slower while saving various types of information in various formats.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">One can access primary memory by data. On the other hand, it is possible to access secondary memory using I\/O channels.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong style=\"font-family: verdana, geneva, sans-serif; font-size: 12pt; color: rgb(17, 17, 17);\"> What is meant by overlays in OS?<\/strong> <\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">This is a typical question in case you are searching for <\/span><strong>OS interview questions<\/strong><span style=\"font-weight: 400\"> on the web. Overlays are actually a programming process that divides processes into segments such that necessary instructions can be saved in the memory. No support will be needed by it from the OS. It has the ability to operate programs that are larger than the physical memory in terms of size by keeping only the essential instructions and data which will be required at any particular time.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What are the top 10 OS examples?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Below, we have mentioned several of the most well-known OS\u2019s which are used extensively right now:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">MS-Windows<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Mac OS<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Android<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Solaris<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Fedora<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Ubuntu<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Debian<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Chrome OS<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Free BSD<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">CentOS<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong style=\"font-family: verdana, geneva, sans-serif; font-size: 12pt; color: rgb(17, 17, 17);\"> What is meant by virtual memory?<\/strong> <\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">The definition of virtual body likewise falls under the most notable <\/span>OS interview questions<span style=\"font-weight: 400\">. Virtual memory is an innovative memory management feature of the OS, creating the illusion of extremely large memory. It is actually a space where it is possible to store a larger number of programs by themselves as pages. In this way, we are able to increase the physical memory size by making use of a disk. It likewise enables us to protect our memory. The OS will be able to manage it in a couple of ways, namely, segmentation and paging. It functions as temporary storage, which one can use together with RAM.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What does thread refer to in OS?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Thread happens to be a path of execution consisting of a programmed computer, stack, thread ID, and a set of registers. It is a basic CPU utilization unit that helps to make communication more efficient and effective, minimizes the time needed for context switching, and allows the use of multiprocessor architectures to achieve higher efficiency and scale. It helps to enhance the performance of programs by means of parallelism. We sometimes call threads lightweight processes since even though they come with their stack, they are capable of accessing shared information.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Multiple threads that run in a process share: Heap, Code segments, Address space, Static data, Global variables, Child processes, Signals, File descriptors, Pending alarms, plus signal handlers.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Every single thread comes with its registers, program counter, state, and stack.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What exactly is a process, and what are its different states?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">You should not ignore this question since it is also one of the most notable <\/span>OS interview questions<span style=\"font-weight: 400\">. A process is essentially a program that is presently being executed. An OS&#8217;s primary function will be to handle and manage all these procedures. Once a program is converted into a process after being loaded into memory, it can be categorized into 4 parts \u2013 stack, text, data, and heap. Processes are of 2 types:<\/span><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">User processes<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Operating system processes<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Various states of the process<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">New State \u2013 A process is created in this state.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Running \u2013 The CPU begins to work on the instructions of the process in this particular state.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Waiting \u2013 The process will not be able to run in this state since it waits for certain events to take place.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Ready \u2013 The process has every resource available in this state that will be needed to operate; however, it waits for getting assigned to a processor since CPUs are not functioning presently on instructions passed by the process.&nbsp;<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Terminate \u2013 The process is completed in this state, which implies that it has been executed.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What is implied by FCFS?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">First Come First Serve (FCFS) is a sort of OS scheduling algorithm executing processes in the identical manner in which they arrive. Put simply, the process arriving first is going to be executed first. It happens to be non-preemptive. First Come First Serve schedule might result in <\/span><span style=\"font-weight: 400\">starvation in the operating system<\/span><span style=\"font-weight: 400\"> in case the burst time of the initial process happens to be the longest. Here, burst time refers to the time needed by the process for execution. Unlike others, it is likewise considered to be the simplest and easiest OS scheduling algorithm. On most occasions, it will be possible to manage FCFS implementation using the First In First Out (FIFO) queue.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What do you mean by Reentrancy?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is a function where it is possible for different clients to use and share only one copy of a program at any given time. This idea is usually linked with OS code and has nothing to do with concurrency.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It comes with a couple of primary functions:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is not possible for the program code to change itself.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is imperative to store local data for all client processes in various disks.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What are the various types of scheduling algorithms?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Scheduling algorithms are going to figure out which processes will be given to the CPU in the ready queue for execution. It is possible to classify scheduling algorithms on the basis of the following:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Preemptive algorithms<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Shortest Job First Scheduling<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Round Robin Scheduling<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Non-preemptive algorithms<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Priority Scheduling<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">First Come First Serve Scheduling<\/span><\/li>\n<\/ul>\n\n\n\n<p><strong><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\">Preemptive algorithms \u2013<\/span><\/strong><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">&nbsp;In this sort of schedule, a process might be interrupted at the execution time, plus the CPU might be assigned to a different process.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Non-Preemptive algorithms &#8211; In this sort of schedule, after the allocation of a CPU to a process, the CPU will not be released until there is a request for switching to a waiting state or termination.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How to differentiate between segmentation and paging?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">The discrimination between paging and segmentation is one of the most common <\/span><strong>operating systems interview questions<\/strong><span style=\"font-weight: 400\">. Paging can be considered a technique of memory management that enables the OS to recover processes into the primary memory from the secondary storage. It is an allocation technique that is non-contiguous and which divides all the processes as pages.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Segmentation is usually a technique of memory management that divides the processes into modules. These modules are referred to as segments that can be assigned to processes.<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Paging is not visible to the programmer. Segmentation will be visible to the programmer.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The pages\u2019 size is constant. The size of the segments isn\u2019t fixed.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is not possible to separate data and procedures in paging. In segmentation, data and procedures can be isolated.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Paging enabled virtual address spaces to cross the main memory. Segmentation enables all data, codes, and programs to get broken up into autonomous address spaces.&nbsp;<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Paging is obtainable mostly on MMU chips and CPUs. Segmentation is available mostly on Windows servers supporting backward compatibility.&nbsp;<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Unlike segmentation, paging is quicker for memory access. Unlike paging, segmentation is slower.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In paging, a free frame has to be maintained by the OS. In segmentation, the OS has to maintain some holes in the primary memory.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The fragmentation type is internal in paging. In segmentation, the fragmentation type is external.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The available memory determines the page size in paging. In the case of segmentation, the user determines the page size.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><strong><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\">Why do we consider the round-robin algorithm to be superior to the first-come, first-served algorithm?<\/span><\/strong><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The FCFS algorithm happens to be the simplest known algorithm. The processes are allocated to the CPU according to their time of arrival in the ready queue. It is non-preemptive, and therefore, after assigning a process to the CPU, it is going to run till it is completed. Since the CPU is taken by a process till completion, it isn&#8217;t good in offering decent response times. Other essential processes can be made to wait unnecessarily by it.<\/span><\/p>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">On the contrary, the <\/span><span style=\"font-weight: 400\">round-robin algorithm<\/span><span style=\"font-weight: 400\"> will be working on the time slice concept, also referred to as quantum. Here, all processes will be provided with a predefined time for completing the process. If it is not possible to complete a process within the predefined time, it will be allocated to the subsequent process in the queue. Thus, it will be feasible to maintain an ongoing execution of the processes, which wouldn&#8217;t be feasible when it comes to the FCFS algorithm.&nbsp;<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What is multiprogramming\u2019s main objective?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">There is no doubt about the fact that this one is also amongst the most typical <\/span><strong>OS interview questions<\/strong><span style=\"font-weight: 400\">. By this, we refer to the capability of executing or performing several programs on one processor machine. This method had been introduced for overcoming the issue of the underutilization of the main memory and the CPU. Put simply; it happens to be the coordination of executing different programs on just one processor simultaneously. Multiprogramming&#8217;s primary objective will be to have at least a few processes operating always. This helps in improving the use of the CPU while it organizes quite a few jobs out there.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How is a copying garbage collector going to work? How is it possible to implement it using semi spaces?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Essentially, the copying garbage collector will function simply by going through objects that are alive and copying them in the memory into a particular region. This collector will be traced through every single live object successively. The whole process will be performed in just one pass. Garbage is any object which isn&#8217;t copied in memory.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is possible to implement the copying garbage collector by making use of semi spaces by dividing the heap into a couple of halves. Every single half happens to be a contiguous memory region. Every single allocation is made from one-half of the heap. Once the specified heap becomes 50% full, the collector will be invoked instantaneously, and it will copy all the live objects into another half of that heap. In this manner, the initial half of the heap will be only containing garbage and will be overwritten eventually in the subsequent pass.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How can you differentiate between multiprocessing and multitasking OS?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">In case you are in the lookout for some authentic <\/span>operating systems interview questions<span style=\"font-weight: 400\">, then this one will be one of them.&nbsp;<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Multitasking happens to be a system that enables more effective usage of the hardware of the computer. This particular system functions on several tasks at any given time by switching quickly between different tasks. We also refer to these systems as time-sharing systems.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">On the other hand, multiprocessing is a system that enables more than one processor in a computing system to process more than 2 portions of the identical program concurrently. Multiprocessing allows the completion of more work within a short span of time.<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">More than one task is performed by multitasking by making use of one processor. Multiprocessing performs several tasks simultaneously by making use of multiple processors.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In the case of multitasking, there is only one CPU. On the other hand, there are several CPUs when it comes to multiprocessing.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">As compared to multiprocessing, multitasking is more economical.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Unlike multiprocessing, multitasking is less efficient.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Multitasking enables fast switching between different tasks. Multiprocessing enables the smooth processing of more than one task simultaneously.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Multitasking needs more time for executing tasks, unlike multiprocessing.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What is implied by sockets in the OS?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">This particular question falls under one of the most important <\/span>OS interview questions<span style=\"font-weight: 400\"> at present. We usually refer to a socket in the OS as an endpoint for Interprocess Communication. In this case, the endpoint is a combination of a port number and an IP address. Sockets help to make it quite simple for application developers to generate network-enabled programs. It likewise enables the exchange or communication of info between a couple of different processes. On most occasions, it is employed in systems that are client-server-based.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Types of sockets<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">You will come across mainly for types of sockets at present:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Datagram Sockets<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Stream sockets<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Raw Sockets<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Sequenced Packet Sockets<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How is reference counting able to manage memory-allocated objects? When will it not succeed in reclaiming objects?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">In case you are considering some typical <\/span>OS interview questions<span style=\"font-weight: 400\">, then this one should be one of them as well. Reference counting will be augmenting every single object with a counting of the number of times it is referenced. There will be an increment in discounting each time a reference is made to that object. Moreover, the reference will be documented each time it is destroyed. There is a repetition of this process until the reference count turns out to be 0. Once it happens, it will be possible to reclaim the object. In this manner, automated memory management can be performed by reference counting systems by maintaining a count in each object. Any object not having a reference can be thought to be dead, and it will be feasible to reclaim that memory.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In the event of cyclic references, the method of reference counting might not succeed in reclaiming objects. There isn&#8217;t any concrete way for preventing this issue, and it will be a good idea to build an architecture not using a circular reference.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What are the required conditions for a deadlock to happen?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>4 conditions will be required for a deadlock to take place:<\/strong><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Mutual exclusion \u2013 The available resources cannot be shared. This signifies that the used resources should be mutually exclusive.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Hold and wait \u2013 Any process for execution will require several resources. If the resources are not available in sufficient amounts, a process will be able to take the obtainable resources, hold those resources, and wait for more to arrive.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">No Preemption \u2013 Those resources that can be held by a process can be released only by the process on its own voluntarily. The system will not be able to preempt this resource.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Circular waiting \u2013 It is a special kind of waiting where one particular process will be waiting for the resources held by another process. In turn, the second process will be held by the initial one.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><strong><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\">What do you mean by aging and starvation in the OS?<\/span><\/strong><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">This particular question falls under one of the most asked <\/span><strong>OS interview questions<\/strong><span style=\"font-weight: 400\">. Starvation happens to be an issue that generally takes place once a process cannot get the necessary resources required by it for execution for a significant period of time. In such conditions, the processes of low priority will be blocked while only those having high priority will be proceeding towards completion, and due to this, low priority processes will be suffering from scarcity of resources.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Aging is a process used for overcoming the situation or issue of starvation in an operating system. It will be increasing the priority of processes that are waiting in the system for a significant span of time. It is one of the best techniques for fixing the issue of starvation, given that an aging factor is added by it to the priority of every single request. Moreover, it helps to make certain that low-level queue processes will be able to accomplish their execution.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What is meant by Semaphore in the OS, and for what reason is it used?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">By the term &#8220;Semaphore&#8221;, we refer to a signalling mechanism. It is able to hold a single positive integer value only. It is employed for solving the issue or problem of vital sections in the process of synchronization by making use of 2 atomic operations; namely, signal() and wait().<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Semaphore types<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">On most occasions, you will come across 2 types of semaphores, Binary Semaphore and Counting Semaphore.<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Binary Semaphore enables different process threads to obtain the resource\u2019s finite instance until more resources are obtainable. Mutex enables different process threads to obtain a single shared resource at any given time only.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The functions of binary semaphore will be based on signaling mechanisms. On the other hand, the functions of Mutex will be based on a locking mechanism.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\"> Unlike Mutex, binary semaphores are pretty fast.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Binary semaphore is essentially an integer. On the contrary, a Mutex is actually an object.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What do you mean by Kernel, and what are its primary functions?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><span style=\"font-weight: 400\">This particular question is an important <\/span><strong>Operating Systems interview question<\/strong><span style=\"font-weight: 400\"> at present. The Kernel is a program that is considered to be a module or central component of an OS. It handles, manages, plus controls every single operation on the computer and hardware. It will be loaded first once the system starts and will remain in the primary memory. Furthermore, it functions as an interface between the hardware and user applications.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Kernel functions<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It manages all the computer resources, including CPU, files, memory, processes, and so forth.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It initiates or facilitates the interaction between different components of software and hardware.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is responsible for managing RAM such that it will be possible for all running programs and processes to function effectively.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It also manages the primary jobs of the OS and also manages the usage of different peripherals linked to the computer.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is accountable for scheduling the task performed by the CPU such that the work of each user is executed efficiently and effectively.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What complexities are added by concurrent processing to an OS?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">There are different complexities of concurrent processing, which are as follows:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is imperative to implement a time-sharing process for enabling multiple procedures to access the system. This will involve the preemption of processes that don\u2019t give up CPU on their own. In fact, kernel code might be executed by several processes concurrently.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The number of resources that can be used by a process plus the operations performed by it should be limited. The processes and system resources should be safeguarded from one another.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Kernel has to be designed to prevent deadlocks between different processes, and cyclic waiting should not occur.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">It is imperative to use effective memory management strategies to use the limited resources in a better way.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>How to differentiate between monolithic Kernel and microkernel?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Microkernel happens to be a minimal OS executing only the essential OS functions. It only consists of a near-minimal number of functions and features required for implementing an OS.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Monolithic Kernel is an OS architecture supporting all the fundamental features of the components of the computer, including memory, file, resource management, and so on.<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In microkernels, user services and kernel services are present in various address spaces. In monolithic kernels, user services and kernel services are typically present in the identical address space.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Unlike monolithic kernels, microkernels are smaller in terms of size.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Unlike monolithic kernels, microkernels can be extended easily.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">In the event of a service crash, the functioning of the microkernel will not be affected. On the other hand, in case there is a service crash, the entire system is going to crash in a monolithic kernel.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><h3><span style=\"font-size: 12pt;font-family: verdana, geneva, sans-serif\"><strong>What issues will you face while implementing a network-transparent system?<\/strong><\/span><\/h3><\/h3>\n\n\n\n<p><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">Primarily, a <a href=\"https:\/\/www.monsterindia.com\/search\/designer-jobs\" title=\"https:\/\/www.monsterindia.com\/search\/designer-jobs\">designer <\/a>will be facing a couple of significant issues during the implementation of a network-transparent system. These are as follows:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">The main issue will be to make every single storage device and processor appear transparent. This signifies that it is imperative for the distributed system to appear as one centralized system using the network.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">While both file systems will be appearing as only one file system, in reality, it might be distributed over the network.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;font-size: 12pt;font-family: verdana, geneva, sans-serif\">User mobility happens to be the secondary problem. The designer will want the users to link with the entire system instead of any specific machine.<\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>OS (operating system) is a software application responsible for managing and handling every single resource of a computer, including software and hardware. The very first OS, known as GMOs, had been introduced in the 50s. An OS manages, handles, and coordinates the overall activities as well as sharing of the resources of the computer. It [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9867,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[147],"tags":[],"class_list":{"0":"post-9454","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-interview-questions"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/posts\/9454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/comments?post=9454"}],"version-history":[{"count":5,"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/posts\/9454\/revisions"}],"predecessor-version":[{"id":35626,"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/posts\/9454\/revisions\/35626"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/media\/9867"}],"wp:attachment":[{"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/media?parent=9454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/categories?post=9454"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.foundit.sg\/career-advice\/wp-json\/wp\/v2\/tags?post=9454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}