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GATE 2019 - Computer Network Quiz-10 (Transport Layer ) (App update required to attempt this test)

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Question 1

Consider a token ring network with a length of 2 km having 10 stations including a monitoring station. The propagation speed of the signal is 2 × 10⁸ m/s and the token transmission time is ignored. If each station is allowed to hold the token for 2 μsec, the minimum time for which the monitoring station should wait (in μsec)before assuming that the token is lost is.....

Question 2

Find the latency of Token Ring (in bits) where data rate of link is 20 Mbps and 40 stations separated by 100 meters and bit delay at each station is 1 bit. (Assume propagation speed as

)

Question 3

Consider the store and forward packet switched network given below. Assume that the bandwidth of each link is 10⁶ bytes / sec. A user on host A sends a file of size 10³ bytes to host B through routers R1 and R2 in three different ways. In the first case a single packet containing the complete file is transmitted from A to B. In the second case, the file is split into 10 equal parts, and these packets are transmitted from A to B. In the third case, the file is split into 20 equal parts and these packets are sent from A to B. Each packet contains 100 bytes of header information along with the user data. Consider only transmission time and ignore processing, queuing and propagation delays. Also assume that there are no errors during transmission. Let T1, T2 and T3 be the times taken to transmit the file in the first, second and third case respectively. Which one of the following is CORRECT?

Question 4

Consider the following statements.
I. TCP connections are full duplex
II. TCP has no option for selective acknowledgement
III. TCP connections are message streams

Question 5

Suppose two hosts use a TCP connection to transfer a large file. Which of the following statements is/are FALSE with respect to the TCP connection?
I. If the sequence number of a segment is m, then the sequencenumber of the subsequent segment is always m+1.
II. If the estimated round trip time at any given point of time is tsec, the value of the retransmission timeout is always set to greater than or equal to tsec.
III. The size of the advertised window never changes during the course of the TCP connection.
IV. The numberof unacknowledged bytesat the sender is alwaysless than or equal to the advertised window.

Question 6

If a TCP RTT is 60 msec, ACK comes in 42msec value of constant parameter

=0.9,
then find the value of Time out.

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GATE & PSU CS Computer Networks

Apr 7GATE & PSU CS