GATE CSE topic:computer-networks PYQs & Answers — Page 6

Questions 51–60 of 72. Imported answers require independent review unless marked reviewed.

Consider the following statements about the functionality of an IP based router.

I. A router does not modify the IP packets during forwarding.

II. It is not necessary for a router to implement any routing protocol.

III. A router should reassemble IP fragments if the MTU of the outgoing link is larger than the size of the incoming IP packet.

Which of the above statements is/are TRUE?

Your answerChoose one option.

I and II only

I only

II and III only

II only

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Assume that you have made a request for a web page through your web browser to a web server. Initially the browser cache is empty. Further, the browser is configured to send HTTP requests in non-persistent mode. The web page contains text and five very small images. The minimum number of TCP connections required to display the web page completely in your browser is ________.

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An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses CIDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISP’s router using route aggregation. Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization? I. 202.61.84.0/21 II. 202.61.104.0/21 III. 202.61.64.0/21 IV. 202.61.144.0/21

Your answerChoose one option.

I and II only

II and III only

III and IV only

I and IV only

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Consider a TCP connection between a client and a server with the following specifications: the round trip time is 6 ms, the size of the receiver advertised window is 50 KB, slow-start threshold at the client is 32 KB, and the maximum segment size is 2 KB. The connection is established at

. Assume that there are no timeouts and errors during transmission. Then the size of the congestion window (in KB) at time

ms after all acknowledgments are processed is ______.

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Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)?

Your answerChoose one option.

IMAP, POP3

SMTP, POP3

SMTP, MIME

IMAP, SMTP

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Consider three machines M, N, and P with IP addresses 100.10.5.2, 100.10.5.5, and 100.10.5.6 respectively. The subnet mask is set to 255.255.255.252 for all the three machines. Which one of the following is true?

Your answerChoose one option.

M, N, and P all belong to the same subnet

Only M and N belong to the same subnet

Only N and P belong to the same subnet

M, N, and P belong to three different subnets

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Suppose that in an IP-over-Ethernet network, a machine X wishes to find the MAC address of another machine Y in its subnet. Which one of the following techniques can be used for this?

Your answerChoose one option.

X sends an ARP request packet to the local gateway’s IP address which then finds the MAC address of Y and sends to X

X sends an ARP request packet to the local gateway’s MAC address which then finds the MAC address of Y and sends to X

X sends an ARP request packet with broadcast MAC address in its local subnet

X sends an ARP request packet with broadcast IP address in its local subnet

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Consider that 15 machines need to be connected in a LAN using 8-port Ethernet switches. Assume that these switches do not have any separate uplink ports. The minimum number of switches needed is ________.

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Match the following:

Field	Length in bits
P. UDP Header’s Port Number	I. 48
Q. Ethernet MAC Address	II. 8
R. IPv6 Next Header	III. 32
S. TCP Header’s Sequence Number	IV. 16

Your answerChoose one option.

P-II, Q-IV, R-II, S-I

P-II, Q-I, R-IV, S-III

P-IV, Q-I, R-II, S-III

P-IV, Q-I, R-III, S-II

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Consider the following statements regarding the slow start phase of the TCP congestion control algorithm. Note that cwnd stands for the TCP congestion window and MSS denotes the Maximum Segment Size.

(i) The cwnd increases by 2 MSS on every successful acknowledgement. (ii) The cwnd approximately doubles on every successful acknowledgement. (iii) The cwnd increases by 1 MSS every round trip time. (iv) The cwnd approximately doubles every round trip time.

Which one of the following is correct?

Your answerChoose one option.

Only (ii) and (iii) are true

Only (i) and (iii) are true

Only (iv) is true

Only (i) and (iv) are true

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GATE CSE topic:computer-networks PYQs

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