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Computer Networks Rapid Quiz - 3 (App update required to attempt this test)

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Question 1

An IP router implementing Classless Inter-domain routing (CIDR) receives a packet with address 131.23.151.The router’s routing table has the following entries:

The identifier of the output interface on which this packet will be forwarded is _____.

Question 2

Assume out of many stations sharing common channel only two stations transmit frames. If collision occurs both of them uses back-off algorithm to send their frames. What is the probability that they both successfully send their frames in 3rd round. (Any one of them can send their frames first).

Question 3

Which addresses can be given to devices in network 131.107.0.0 with a standard class B subnet mask ?
i) 131.107.0.255
ii) 131.107.0.1
iii) 131.107.1.0
iv) 131.107.0.0

Question 4

Suppose that the disk has the following parameters.
• 200 GB Size
• 12000 rotations per minute
• Data transfer rate= 8 X 10bytes/sec
• Average seek time=8 ms
• Block size=1024 bytes
If head is already placed at required blocks, what is the data transfer time (in ms) to transfer a single block?

Question 5

Let M be the message and n be the no of layers in a particular protocol to implement hierarchy. Let H be the size of header which is added at each and every layer. What is the percentage of header data in message finally transmitted to the network?

Question 6

Alice and Bob want to send the data to each other securely. They want to use the shared key to do that. They use the Diffie-Hellman algorithm to generate the shared key. In Diffie-Hellman if p = 23 and g = 5, and Alice chooses the secret number a = 4, and Bob chooses the secret number b =3 What is the secret key that is generated ________?
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Apr 7GATE & PSU CS