Node X has a TCP connection open to node Y. The packets from X to Y go through an intermediate IP router R. Ethernet switch S is the first switch on the network path between X and R. Consider a packet sent from X to Y over this connection. Which of the following statements is/are TRUE about the destination IP and MAC addresses on this packet at the time it leaves X?

One or more correct

Source: GATE CSE 2024 Set 2 (CS2), IISc Bengaluru. Official question paper.

GATE CSE 2024 | Set 2 | Question 55

MAC & Ethernet

NAT2 marks

Consider an Ethernet segment with a transmission speed of

10^8

bits/sec and a maximum segment length of 500 meters. If the speed of propagation of the signal in the medium is

2 \times 10^8

meters/sec, then the minimum frame size (*in bits*) required for collision detection is __________

Numerical answer

Your answer

Source: GATE CSE 2024 Set 2 (CS2), IISc Bengaluru. Official question paper.

GATE CSE 2021 | Set 1 | Question 8

MAC & Ethernet

MCQ1 mark

Consider the following two statements.

S_1

: Destination MAC address of an ARP reply is a broadcast address.

S_2

: Destination MAC address of an ARP request is a broadcast address. Which one of the following choices is correct?

Single correct

Answer key coming soon

Source: GATE CSE 2021 Set 1 (CS1), IIT Bombay. Official question paper.

GATE CSE 2021 | Set 2 | Question 54

MAC & Ethernet

NAT2 marks

Consider a network using the pure ALOHA medium access control protocol, where each frame is of length 1,000 bits. The channel transmission rate is 1 Mbps (

= 10^6

bits per second). The aggregate number of transmissions across all the nodes (including new frame transmissions and retransmitted frames due to collisions) is modelled as a Poisson process with a rate of 1,000 frames per second. Throughput is defined as the average number of frames successfully transmitted per second. The throughput of the network (rounded to the nearest integer) is ________.

Numerical answer

Your answer

Answer key coming soon

Source: GATE CSE 2021 Set 2 (CS2), IIT Bombay. Official question paper.

GATE CSE 2019 | Question 29

MAC & Ethernet

MCQ2 marks

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?

Single correct

Source: GATE CSE 2019, IIT Madras. Official question paper and answer key.

GATE CSE 2019 | Question 49

MAC & Ethernet

NAT2 marks

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 _____.

Numerical answer

Your answer

Source: GATE CSE 2019, IIT Madras. Official question paper and answer key.

GATE CSE 2018 | Question 55

MAC & Ethernet

NAT2 marks

Consider a simple communication system where multiple nodes are connected by a shared broadcast medium (like Ethernet or wireless). The nodes in the system use the following carrier-sense based medium access protocol. A node that receives a packet to transmit will carrier-sense the medium for 5 units of time. If the node does not detect any other transmission in this duration, it starts transmitting its packet in the next time unit. If the node detects another transmission, it waits until this other transmission finishes, and then begins to carrier-sense for 5 time units again. Once they start to transmit, nodes do not perform any collision detection and continue transmission even if a collision occurs. All transmissions last for 20 units of time. Assume that the transmission signal travels at the speed of 10 meters per unit time in the medium. Assume that the system has two nodes P and Q, located at a distance d meters from each other. P starts transmitting a packet at time t=0 after successfully completing its carrier-sense phase. Node Q has a packet to transmit at time t=0 and begins to carrier-sense the medium. The maximum distance d (in meters, rounded to the closest integer) that allows Q to successfully avoid a collision between its proposed transmission and P's ongoing transmission is _____.

Numerical answer

Your answer

Source: GATE CSE 2018, IIT Guwahati. Official question paper and answer key.

GATE CSE 2016 | Set 2 | Question 24

MAC & Ethernet

MCQ1 mark

In an Ethernet local area network, which one of the following statements is TRUE?

Single correct

Answer key coming soon

Source: GATE CSE 2016 Set 2, IISc Bengaluru. Official question paper.

GATE CSE 2016 | Set 2 | Question 53

MAC & Ethernet

NAT2 marks

A network has a data transmission bandwidth of

20 \times 10^6

bits per second. It uses CSMA/CD in the MAC layer. The maximum signal propagation time from one node to another node is 40 microseconds. The minimum size of a frame in the network is ________ bytes.

Numerical answer

Your answer

Answer key coming soon

Source: GATE CSE 2016 Set 2, IISc Bengaluru. Official question paper.

GATE CSE 2016 | Set 2 | Question 54

MAC & Ethernet

MCQ2 marks

For the IEEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE? I. At least three non-overlapping channels are available for transmissions. II. The RTS-CTS mechanism is used for collision detection. III. Unicast frames are ACKed.

Single correct

Answer key coming soon

Source: GATE CSE 2016 Set 2, IISc Bengaluru. Official question paper.

GATE CSE 2015 | Set 1 | Question 39

MAC & Ethernet·Probability & Statistics

NAT2 marks

Consider a LAN with four nodes

S_1, S_2, S_3

and

S_4

. Time is divided into fixed-size slots, and a node can begin its transmission only at the beginning of a slot. A collision is said to have occurred if more than one node transmit in the same slot. The probabilities of generation of a frame in a time slot by

S_1, S_2, S_3

and

S_4

are 0.1, 0.2, 0.3 and 0.4, respectively. The probability of sending a frame in the first slot without any collision by any of these four stations is _____.

Numerical answer

Your answer

Source: GATE CSE 2015 Set 1, IIT Kanpur. Official question paper and answer key.

GATE CSE 2015 | Set 3 | Question 35

MAC & Ethernet

MCQ1 mark

Consider a CSMA/CD network that transmits data at a rate of 100 Mbps (

10^8

bits per second) over a 1 km (kilometer) cable with no repeaters. If the minimum frame size required for this network is 1250 bytes, what is the signal speed (km/sec) in the cable?

Single correct

Source: GATE CSE 2015 Set 3, IIT Kanpur. Official question paper and answer key.

GATE CSE 2014 | Set 1 | Question 26

MAC & Ethernet

NAT2 marks

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 \times 10^8

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 _____.

Numerical answer

Your answer

Source: GATE CSE 2014 Set 1, IIT Kharagpur. Official question paper and answer key.

GATE CSE 2013 | Question 36

MAC & Ethernet

MCQ2 marks

Determine the maximum length of the cable (in km) for transmitting data at a rate of 500 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/s.

Single correct

Answer key coming soon

Source: GATE CSE 2013, IIT Bombay. Official question paper (booklet code A).

Use ← → to move

Questions

14 total

Correct Wrong Answer seen

Sort

Filters

Year

Set

Marks

Marks

Question type

Question type