GATE CSE Computer Networks PYQs & Answers

Questions 1–10 of 72. Imported answers require independent review unless marked reviewed.

With respect to a TCP connection between a client and a server, which one of the following statements is true?

Your answerChoose one option.

The client and server use a two-way handshake mechanism before the start of data transmission

The server cannot initiate closing of the connection before the client initiates closing of the connection

The TCP connection is half-duplex

The client and server can initiate closing of the connection at the same time

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Which of the following statements is/are true with respect to the interaction of a web browser with a web server using HTTP 1.1?

Your answerSelect all correct options. You can choose more than one.

HTTP 1.1 facilitates downloading multiple objects of the same webpage over the same TCP connection, if the objects are stored in the same server

HTTP 1.1 facilitates downloading multiple objects of the same webpage over the same TCP connection, even if they are stored in different servers

HTTP 1.1 facilitates sending a request for downloading one object without waiting for a previously requested object to be downloaded completely

HTTP 1.1 facilitates downloading multiple webpages on the same server to be downloaded over a single TCP connection

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Consider a file of size 4 million bytes being transferred between two hosts connected via a path consisting of three consecutive links of bandwidth 2 Mbps, 500 kbps, and 1 Mbps, respectively. All processing delays and propagation delays are negligible. Assume that there is no other background traffic over the path and no other overhead to transfer the file. Which one of the following is the total time (in seconds) to transfer the file? Note: 1M=

, 1k=

Your answerChoose one option.

731

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Which one of the following protocols may need to broadcast some of its messages?

Your answerChoose one option.

SMTP

FTP

DHCP

HTTP

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If an IP network uses a subnet mask of 255.255.240.0, the maximum number of IP addresses that can be assigned to network interfaces is __________. (answer in integer)

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Consider the transmission of data bits 1100101 over a link that uses Cyclic Redundancy Check (CRC) code for error detection. If the generator bit pattern is given to be 1001, which one of the following options shows the remainder bit pattern appended to the data bits before transmission?

Your answerChoose one option.

011

101

000

100

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A TCP sender successfully establishes a connection with a TCP receiver and starts the transmission of segments. The TCP congestion control mechanism’s slow-start threshold is set to 1000 segments. Assume that the round-trip time is fixed at 1 milisecond. Assume that the sender always has data to send, the segments are numbered from 1, and no segment is lost. Let

denote the time (in miliseconds) at which the transmission of segment number 2000 starts. Which one of the following options is correct?

Your answerChoose one option.

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Consider the implementation of sliding window protocol over a lossless link, with a window size of

frames, where each frame is of size 1000 bits (including header). The bandwidth of the link is 100 kbps (

) and the one-way propagation delay is 100 miliseconds. Assume that processing times at the sender and receiver are zero and the transmission time of acknowledgments is also zero. Which one of the following options gives the minimum size of

(in number of frames) required to achieve 100% link utilization?

Your answerChoose one option.

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An ISP having an address block 202.16.0.0/15 assigns a block of 600 IP addresses to a client, using the classless inter domain routing (CIDR) super-netting approach. Which of the following address blocks can be assigned by the ISP?

Your answerSelect all correct options. You can choose more than one.

202.16.0.0/19

202.17.64.0/19

202.16.32.0/19

202.17.24.0/19

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Consider a new TCP connection between a sender and a receiver. The receiver advertised window is constant at 48 KB, the maximum segment size (MSS) is 2 KB, and the slow start threshold for TCP congestion control is 16 KB. Assume that there are no timeouts or duplicate acknowledgements. The number of rounds of transmission required for the congestion control algorithm of the TCP connection to reach the congestion avoidance phase is __________. (answer in integer)

Note: 1K=2¹⁰

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GATE CSE Computer Networks PYQs

How to practice Computer Networks

Question 18

Question 19

Question 21

Question 22

Question 33

Question 43

Question 44

Question 45

Question 56

Question 58