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GATE 2018 Exam:Quiz OS and CN

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Question 1

In a RSA cryptosystem a participant A uses two prime numbers p = 13 and q = 17 to generate her public and private keys. If the public key of A is 35. Then the private key of A is ______.

Question 2

Consider a router having following CIDR entries in it’s routing table :

Here now, two packets are arrived with following IP addresses decide which router will deliver respective packet.

Question 3

Which layer manages and synchronises conversations between two different applications

Question 4

Which topology has the highest reliability?

Question 5

We know that RSA algorithm is used to encrypt the data which is being sent. It is implemented in ______ layer.

Question 6

A process is executed in 100 msec. It takes 10 msec. for the CPU to decide which process to execute. Then how much percentage of CPU time is used for scheduling.

Question 7

Consider the following four process, with the length of the CPU burst time in milliseconds.

Using the Shortest-remaining-Time-First(SRTF) scheduling, the average waiting time is-

Question 8

Which one of the following is not involved in Preventing the dead lock.

Question 9

How many disk blocks are needed, if we used free list method. Disk block address is 16 Bits, disk block size is 64 bytes, Total number of blocks are 4096 out of which 2048 are free blocks.

Question 10

For a given reference string find the number of page faults
7,0,1,2,0,3,0,4,2,3,0,3,2,1,2,0,1,7,0,1 =>when using LRU algorithm when number of available frames are three.
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Aug 18GATE & PSU CS