File Name: operating system and networks it series .zip
A network operating system NOS is a specialized operating system for a network device such as a router , switch or firewall. Historically operating systems with networking capabilities were described as network operating system, because they allowed personal computers PCs to participate in computer networks and shared file and printer access within a local area network LAN. This description of operating systems is now largely historical, as common operating systems include a network stack to support a client—server model. Historically a network operating system was an operating system for a computer which implemented network capabilities.
An Operating system is an essential part in any computer system. There is a huge demand for OS developers in the IT industry.
To build a career as an Operating System developer, candidates need to crack the interview in which they are asked for various Operating System interview questions. We have compiled a list of frequently asked OS interview questions and answers that an interviewer might ask you during your Operating System job interview or viva. Candidates are likely to be asked basic to advance level Operating System interview questions depending on their experience and various other factors.
The below list covers all the important Operating System questions for freshers as well as experienced Operating System professionals. This common OS Developer interview questions guide will help you clear the interview and help you get your dream job.
Operating systems exist for two main purposes. One is that it is designed to make sure a computer system performs well by managing its computational activities.
Another is that it provides an environment for the development and execution of programs. With an increased number of processors, there is a considerable increase in throughput. It can also save more money because they can share resources.
Finally, overall reliability is increased as well. A kernel is the core of every operating system. It connects applications to the actual processing of data. It also manages all communications between software and hardware components to ensure usability and reliability. Real-time systems are used when rigid time requirements have been placed on the operation of a processor.
It has well defined and fixed time constraints. Virtual memory is a memory management technique for letting processes execute outside of memory. This is very useful especially is an executing program cannot fit in the physical memory. The main objective of multiprogramming is to have a process running at all times.
With this design, CPU utilization is said to be maximized. In a Time-sharing system, the CPU executes multiple jobs by switching among them, also known as multitasking. This process happens so fast that users can interact with each program while it is running. It is the most common type of multiple-processor systems. In this system, each processor runs an identical copy of the operating system, and these copies communicate with one another as needed.
Server systems can be classified as either computer-server systems or file server systems. In the first case, an interface is made available for clients to send requests to perform an action.
In the second case, provisions are available for clients to create, access and update files. In asymmetric clustering, a machine is in a state known as hot standby mode where it does nothing but to monitor the active server. A thread is a basic unit of CPU utilization. In general, a thread is composed of a thread ID, program counter, register set, and the stack.
FCFS stands for First-come, first-served. It is one type of scheduling algorithm. Implementation is managed by a FIFO queue. RR round-robin scheduling algorithm is primarily aimed for time-sharing systems.
A circular queue is a setup in such a way that the CPU scheduler goes around that queue, allocating CPU to each process for a time interval of up to around 10 to milliseconds.
Deadlock situations occur when four conditions occur simultaneously in a system: Mutual exclusion; Hold and Wait; No preemption; and Circular wait. It gets its name from a banking system wherein the bank never allocates available cash in such a way that it can no longer satisfy the needs of all of its customers.
One is that it depends on how often a deadlock is likely to occur under the implementation of this algorithm. The other has to do with how many processes will be affected by deadlock when this algorithm is applied. Logical address refers to the address that is generated by the CPU. On the other hand, physical address refers to the address that is seen by the memory unit. With dynamic loading, a routine is not loaded until it is called.
This method is especially useful when large amounts of code are needed in order to handle infrequently occurring cases such as error routines. Overlays are used to enable a process to be larger than the amount of memory allocated to it. The basic idea of this is that only instructions and data that are needed at any given time are kept in memory.
Paging is a memory management scheme that permits the physical address space of a process to be noncontiguous. It avoids the considerable problem of having to fit varied sized memory chunks onto the backing store. Fragmentation is memory wasted. It can be internal if we are dealing with systems that have fixed-sized allocation units, or external if we are dealing with systems that have variable-sized allocation units.
During regular intervals that are set by the operating system, processes can be copied from main memory to a backing store, and then copied back later. Swapping allows more operations to be run that can fit into memory at one time. A socket provides a connection between two applications. Each endpoint of a communication is a socket.
Direct Access method is based on a disk model of a file, such that it is viewed as a numbered sequence of blocks or records. It allows arbitrary blocks to be read or written.
Direct access is advantageous when accessing large amounts of information. Thrashing refers to an instance of high paging activity. This happens when it is spending more time paging instead of executing. The best paging size varies from system to system, so there is no single best when it comes to page size. There are different factors to consider in order to come up with a suitable page size, such as page table, paging time, and its effect on the overall efficiency of the operating system.
Typically, the different attributes for a file structure are naming, identifier, supported file types, and location for the files, size, and level of protection.
Root partition is where the operating system kernel is located. It also contains other potentially important system files that are mounted during boot time. This prevents conflicts whenever such devices are incorporated in a systems unit. It is based on a file-representation structure known as vnode, which contains a numerical designator needed to support network file systems. Multitasking is the process within an operating system that allows the user to run several applications at the same time.
A command line interface allows the user to type in commands that can immediately provide results. Many seasoned computer users are well accustomed to using the command line because they find it quicker and simpler.
However, the main problem with a command line interface is that users have to be familiar with the commands, including the switches and parameters that come with it. This is a downside for people who are not fond of memorizing commands. Caching is the processing of utilizing a region of fast memory for a limited data and process.
A cache memory is usually much efficient because of its high access speed. Spooling is normally associated with printing. When different applications want to send an output to the printer at the same time, spooling takes all of these print jobs into a disk file and queues them accordingly to the printer.
An assembler acts as a translator for low-level language. Assembly codes written using mnemonic commands are translated by the Assembler into machine language. Interrupts are part of a hardware mechanism that sends a notification to the CPU when it wants to gain access to a particular resource.
It provides users with an interface wherein actions can be performed by interacting with icons and graphical symbols. People find it easier to interact with the computer when in a GUI especially when using the mouse.
Instead of having to remember and type commands, users click on buttons to perform a process. Preemptive multitasking allows an operating system to switch between software programs. This, in turn, allows multiple programs to run without necessarily taking complete control over the processor and resulting in system crashes. Partitioning and formatting create a preparatory environment on the drive so that the operating system can be copied and installed properly.
This includes allocating space on the drive, designating a drive name, determining and creating the appropriate file system and structure. It is the process of using the output of one program as an input to another. For example, instead of sending the listing of a folder or drive to the main screen, it can be piped and sent to a file, or sent to the printer to produce a hard copy. Internal commands are built-in commands that are already part of the operating system.
External commands are separate file programs that are stored in a separate folder or directory. The reason behind this is that filenames under this operating system are limited to 8 characters when working under DOS environment. How can you add new entries to the launcher? In Ubuntu, Unity is the default graphical shell. On the left side of the Ubuntu, it introduces the launcher and Dash to start programs.
In order to add new entries to the launcher, you can create a file name like. Export is a command in Bash shell language. When you try to set a variable, it is visible or exported to any subprocess started from that instance of bash. The variable will not exist in the sub-process without the export command.
The book is centered around three conceptual pieces that are fundamental to operating systems: virtualization, concurrency, and persistence. In understanding the conceptual, you will also learn the practical, including how an operating system does things like schedule the CPU, manage memory, and store files persistently. Lots of fun stuff! Or maybe not so fun? This book is and will always be free in PDF form, as seen below. For those of you wishing to BUY a copy, please consider the following:. Lulu Hardcover v1.
An Operating system is an essential part in any computer system. There is a huge demand for OS developers in the IT industry. To build a career as an Operating System developer, candidates need to crack the interview in which they are asked for various Operating System interview questions. We have compiled a list of frequently asked OS interview questions and answers that an interviewer might ask you during your Operating System job interview or viva. Candidates are likely to be asked basic to advance level Operating System interview questions depending on their experience and various other factors. The below list covers all the important Operating System questions for freshers as well as experienced Operating System professionals. This common OS Developer interview questions guide will help you clear the interview and help you get your dream job.
Real-time operating system RTOS is an operating system intended to serve real time application that process data as it comes in, mostly without buffer delay. It is time-bound system that can be defined as fixed time constraints. In this type of system, processing must be done inside the specified constraints.
An operating system is a big piece of software that acts as an interface between the user and the computer hardware, which does multiple functions such as. In General, The Operating System that we use on our computer at home, our laptops, tablets, phones would often be identified as a single-user operating system since only one user can interact with the computer at any given point in time. A multi-user operating system is an operating system that allows multiple users to connect and operate a single operating system.
As already mentioned, in addition to the hardware, a computer also needs a set of programs—an operating system—to control the devices. This page will discuss the following:. Mac OS. An operating system OS is a set of programs which ensures the interoperability of the hardware and software in your computer. The operating system enables, among other things,. What happens when you turn on your computer or smartphone? Over the years, several different operating systems have been developed for different purposes.
Want to see all the things we offer? View all products and services. Vault is an Australian cloud infrastructure provider that offers Australian Signals Directorate certified secure cloud services for the Australian Federal Government. I must have built OpenStack demos a dozen times or more over the past few years, for the purposes of learning, training others, or providing proof of concept environments to clients.
- Но если вы в центре, то это совсем недалеко от. - Извините, но для прогулок час слишком поздний.
Стратмор хмыкнул. Мысль Сьюзан показалась ему достойной внимания. - Неплохо, но есть одно. Он не пользовался своими обычными почтовыми ящиками - ни домашним, ни служебными.
Наверное, он сейчас у .
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