I am aware of how async await works. d.  The main objective of NSF is to keep forwarding packets after a route processor failover Under multiprogramming, turnaround time for short jobs is usually ________ and that for long jobs is slightly ___________. 6. This change will then be propagated throughout the domain. your coworkers to find and share information. Then you'll know. Question:—Which of the following statements are false about “Non stop forwarding” (NSF) (select three answers) Which of the following is not an advantage about thread? This is added work, not reduced work. No – Loopguard should be enabled on blocking ports on Rootguard should be enabled on designated ports I am confused as to why you think a context switch happens on an IO operation. Question:—To debug VTP events, the following command needs to be issued: Explanation: The jacketing technique is used to convert a blocking system call into non blocking system call. A program has a longer life span. Stack Overflow for Teams is a private, secure spot for you and Practice test for UGC NET Computer Science Paper. Hire a worker, and as soon as they are blocked on a high-latency task, put them to work doing something else so the CPU stays as hot as possible all the time. On the server async IO is mainly useful for saving threads. A process contains memory address which is called address space. When execution reaches an await, the awaitable operand is evaluated, and then it is checked to see if the operation is complete. c.  CEF Also, we need to transition to kernel mode two times instead of once (first to initiate the IO, then to dequeue the IO completion notification). Practice these MCQ questions and answers for preparation of various competitive and entrance exams. This is what I mentioned. 1. Which bank do you think has faster customer service? That's why CPU usage generally increases (slightly), except if the machine is very high on CPU load and the work queues are often capable of delivering a new item immediately. Which of the following is true about user level thread? b. Let's consider two banks with lots of customers and lots of employees. C. data segment process (adsbygoogle = window.adsbygoogle || []).push({}); Question:–Loopguard should be enabled on designated ports and Rootguard should be enabled on blocking ports a. A. Thread switching does not need to interact with operating system. f.  To run NSF, both supervisors need an identical IOS image B. 1. B. increases concurrency 15. When a context switch occurs, the kernel saves the context of the old process in its PCB and loads the saved context of the new process scheduled to run. a) Job Queue b) PCB queue c) Device Queue d) Ready Queue View Answer. Podcast 289: React, jQuery, Vue: what’s your favorite flavor of vanilla JS? MS Access provides a great database development tool through simple user-friendly graphical user interface. Its speed varies from machine to machine, depending on the memory speed, the number of registers that must be copied, and the existence of special instructions. C. Multiple threaded processes use fewer resources. When a context switch occurs, the kernel saves the context of the old process in its PCB and loads the saved context of the new process scheduled to run. This GATE exam includes questions from previous year GATE papers. You want to be consuming as much CPU as possible all the time! B. async/await - when to return a Task vs void? A program is stored on disk in some file.It does not contain any other resource. Use of threads provides concurrency within a process. This change will then be propagated throughout the domain. Would not they result into unnecessarily context switch. D.Utilities used for system administration are stored in /sbin. C. kernel is single threaded CPU Scheduling is the basis of _________ operating system. Don't hire a worker and then pay them to sleep! What is the difference between asynchronous programming and multithreading? Interrupt Context Switching Context Switching. All threads can share same set of open files, child processes. IO operations run on hardware, below the level of OS threads. Does Async-await saves only memory consumption(by creating lesser threads). f.  Administrator uses ping to verify the reachability of the router in question What is true about thread? Of course, if the current caller was the only thing on this thread, then the thread is done. CCNP Routing and Switching Solved MCQ contain set of 10 MCQ questions for CCNP MCQ which will help you to clear beginner level quiz. 7. D. Both B and C. Explanation: Kernel-level threads are slower to create and manage is true about kernal level thread. Sync is faster. Yes The kernel is _______ of user threads. Most people wear a lot of hats every day. B. Kernel-level threads are slower to create and manage. d.  Process switching The purpose of await is to (1) make more efficient use of expensive worker threads by allowing workflows to become more asynchronous, and thereby freeing up threads to do work while waiting for high-latency results, and (2) to make the source code for asynchronous workflows resemble the source code for synchronous workflows. (pseudo) parallel, than to try to keep track of how the CPU switches from program to program. Type of switching which uses the entire capacity of a dedicated link? So let's come back to your fundamental question: Does async await increases Context switching. Assuming sync IO API is used in this case. In how many ways Threads are implemented? It might be the UI thread. 10. rev 2020.11.24.38066, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. c.  Cisco switches support up to 16 MSTIs and 1 IST To subscribe to this RSS feed, copy and paste this URL into your RSS reader. d.  A default route would need to be used to forward the traffic It generally increases CPU usage in real-world loads. A simple way to convince yourself that async IO generally costs more CPU than sync IO is to run a simple TCP ping/pong benchmark sync and async. Sure but you have this completely backwards. What do you mean by "Therefore, there are no context switching savings caused by processing multiple IO completions on one context switch", Context switches can be saved if multiple IOs are initiated without blocking and later multiple IOs are completed without blocking. also async await is more about operation chaining and letting the framework manage context-switching if at all it may be required. d.  Only GLBP offers load balancing between multiple routers in the group Typical workloads run with <<100% CPU. False a. This would typically happen if the app reads a file or socket slower than data can be provided. To the kernel an IO is just a data structure. To learn more, see our tips on writing great answers. No But there is no requirement that an async method be the only call on a thread! As far as I know, in case of sync IO, while IO takes place, thread goes into sleep mode. This allows multiple processes to share a single central processing unit (CPU), and is an essential feature of a multitasking operating system.. I know a great way to find out. Question:—Which of the following would likely result in a CEF punt: (select three answers) Write a program using await, write another one without, run them both, and measure the number of context switches per second. Making statements based on opinion; back them up with references or personal experience. 7. D. All of the above. A. Question:—-You must configure “vtp pruning” on all switches in the domain e.  NSF relies on CEF for packet forwarding while RIB is being rebuilt after a failure D. All of the above. Thanks Eric for your answer! Context-switch time is pure overhead, because the system does no useful work while switching. But I don't see why context switches per second is a relevant metric. 4. But I don't see why context switches per second is a relevant metric. Context Sensitive Grammar(CSG) can be recognized by Finite State Machine: 23: A FSM can be considered, having finite tape length without rewinding capability and unidirectional tape movement (a.) I know that when execution reaches to await, it release the thread. Or it also saves cpu as well? Lists of Long Descriptive type Questions that may be asked in Written Exams. The owner of that machine paid good money for that CPU; it should be running at 100% all the time that there is work to be done! It is an instance of an executing program, including the current values of the program counter, registers & variables. I'm not even sure it would be suitable to unblock the UI thread since all tasks might complete synchronously. In a ________ network, two types of addressing are involved: global and local.

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