GATE CSE topic:computer-networks PYQs & Answers — Page 2

Questions 11–20 of 72. Imported answers require independent review unless marked reviewed.

It is necessary to design a link-layer protocol between two hosts that are directly connected over a lossless link of length 300 kilometers. Assume that the link bandwidth is

bits per second and that the propagation delay in the link is 5 nanoseconds per meter. Every transmitted data byte is assigned a unique sequence number.

Let

be the minimum number of bits needed for the sequence number field in the protocol header such that

i. the sequence numbers do not wrap around before 60 seconds, and ii. the maximum utilization of the link is achieved.

The value of

is ______. (answer in integer)

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Identify the ONE CORRECT matching between the OSI layers and their corresponding functionalities as shown.

OSI Layers	Functionalities
(a) Network layer	(I) Packet routing
(b) Transport layer	(II) Frame and error handling
(c) Datalink layer	(III) Host to host communication

Your answerChoose one option.

(a)-(I), (b)-(II), (c)-(III)

(a)-(I), (b)-(III), (c)-(II)

(a)-(II), (b)-(I), (c)-(III)

(a)-(III), (b)-(II), (c)-(I)

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Consider the following statements:

(i) Address Resolution Protocol (AR) provides a mapping from an IP address to the corresponding hardware (link-layer) address. (ii) A single TCP segment from a sender S to a receiver R cannot carry both data from S to R and acknowledgement for a segment from R to S.

Which ONE of the following is CORRECT?

Your answerChoose one option.

Both (i) and (ii) are TRUE

(i) is TRUE and (ii) is FALSE

(i) is FALSE and (ii) is TRUE

Both (i) and (ii) are FALSE

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Consider the routing protocols given in List I and the names given in List II:

List I | List II (i) Distance vector routing | (a) Bellman-Ford (ii) Link state routing | (b) Dijkstra

For matching of items in List I with those in List II, which ONE of the following options is CORRECT?

Your answerChoose one option.

(i) – (a) and (ii) – (b)

(i) – (a) and (ii) – (a)

(i) – (b) and (ii) – (a)

(i) – (b) and (ii) – (b)

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A machine receives an IPv4 datagram. The protocol field of the IPv4 header has the protocol number of a protocol X.

Which ONE of the following is NOT a possible candidate for X?

Your answerChoose one option.

Internet Control Message Protocol (ICMP)

Internet Group Management Protocol (IGMP)

Open Shortest Path First (OSPF)

Routing Information Protocol (RIP)

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Consider the 3-way handshaking protocol for TCP connection establishment. Let the three packets exchanged during the connection establishment be denoted as P1, P2, and P3, in order. Which of the following option(s) is/are TRUE with respect to TCP header flags that are set in the packets?

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

P3: SYN = 1, ACK = 1

P2: SYN = 1, ACK = 1

P2: SYN = 0, ACK = 1

P1: SYN = 1

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Consider a network that uses Ethernet and IPv4. Assume that IPv4 headers do not use any options field. Each Ethernet frame can carry a maximum of 1500 bytes in its data field. A UDP segment is transmitted. The payload (data) in the UDP segment is 7488 bytes.

Which ONE of the following choices has the CORRECT total number of fragments transmitted and the size of the last fragment including IPv4 header?

Your answerChoose one option.

5 fragments, 1488 bytes

6 fragments, 88 bytes

6 fragments, 108 bytes

6 fragments, 116 bytes

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Suppose we are transmitting frames between two nodes using Stop-and-Wait protocol. The frame size is 3000 bits. The transmission rate of the channel is 2000 bps (bits/second) and the propagation delay between the two nodes is 100 milliseconds. Assume that the processing times at the source and destination are negligible. Also, assume that the size of the acknowledgment packet is negligible. Which ONE of the following most accurately gives the channel utilization for the above scenario in percentage?

Your answerChoose one option.

88.23

93.75

85.44

66.67

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A packet with the destination IP address 145.36.109.70 arrives at a router whose routing table is shown. Which interface will the packet be forwarded to?

Subnet Address	Subnet Mask (in CIDR notation)	Interface
145.36.0.0	/16	E1
145.36.128.0	/17	E2
145.36.64.0	/18	E3
145.36.255.0	/24	E4
Default	--	E5

Your answerChoose one option.

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Suppose a message of size 1500 bytes is transmitted from a source to a destination using IPv4 protocol via two routers as shown in the figure. Each router has a defined maximum transmission unit (MTU) as shown in the figure, including IP header. The number of fragments that will be delivered to the destination is _______. (Answer in integer)

Diagram for Computer Science and Information Technology question 57

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GATE CSE topic:computer-networks PYQs

Question 65

Question 16

Question 16

Question 17

Question 18

Question 22

Question 23

Question 36

Question 40

Question 57