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# GATE CS 2021 : Computer Network Quiz 2 (App update required to attempt this test)

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Question 1

How long does it take a packet of length 1,000 bytes to propagate over a link of distance 2,500 km, propagation speed 2.5 * 108 m/s, and transmission rate 2 Mbps? Does this delay depend on packet length? Does this delay depend on transmission rate?

Question 2

Which of the following is true about JAM signal?

Question 3

In the slow-start algorithm, the size of the congestion window increases __________ until it reaches a threshold.

Question 4

Data Link Layer implements the CRC for detecting the errors in the transmitted frame. Let P(x) be the polynomial which represents the data bits, G(x) be the polynomial representing generator function for CRC and R(x) be the message which is received by the receiver.
P(x): x11+ x10+ x7+ x5+ x3+ x2+ x
G(x): x3+ x+ 1
R(x): x14+ x13+ x10+ x7+ x3+ x2+ x+ 1
How many bits of error is present in the message received at the receiver’s end?

Question 5

Assume that your are designing the sliding window protocol for a point to point link from earth to moon. The bandwidth of the channel is 1Mbps. The link has one way latency(Delay) of 1.25 sec. Assume that each frame carries 2 KB data, what is the minimum number of bits needed for the sequence number of the above sliding window protocol ____________.

Question 6

Consider the following statements

(1) The efficiency of stop and wait protocol is (2) The efficiency of Stop and wait protocol is more than GO Back N protocol.

(3) In GO Back N, whenever there is packet lost we re-transmit the whole window.

(4) In Selective repeat protocol, whenever there is packet lost we re-transmit the whole window.

The number of correct statement is ________?

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