Medium Access Control PYQ QUIZ GATE CS

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Question 1

A network has a data transmission bandwidth of 20 × 106 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.
Note : This question was asked as Numerical Answer Type.

  • 200

  • 250

  • 400

  • 1200

Question 2

A network with CSMA/CD protocol in the MAC layer is running at 1 Gbps over a 1 km cable with no repeaters. The signal speed in the cable is 2 x 108 m/sec. The minimum frame size for this network should be 

 
 

  • 10000 bits
     

  • 10000 bytes
     

  • 5000 bits
     

  • 5000 bytes
     

Question 3

Consider a CSMA/CD network that transmits data at a rate of 100 Mbps (108 bits per second) over a 1 km (kilometre) 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?

  • 8000

  • 10000

  • 16000

  • 20000

Question 4

A 2 km long broadcast LAN has 107 bps bandwidth and uses CSMA/CD. The signal travels along the wire at 2 × 108 m/s. What is the minimum packet size that can be used on this network?

  • 50 bytes

  • 100 bytes

  • 200 bytes

  • None of these

Question 5

Suppose the round trip propagation delay for a 10 Mbps Ethernet having 48-bit jamming signal is 46.4 ms. The minimum frame size is

  • 94

  • 416

  • 464

  • 512

Question 6

In a token ring network the transmission speed is 10^7 bps and the propagation speed is 200 meters/micro second. The 1-bit delay in this network is equivalent to:
 

  • 500 metres of cable.
     

  • 200 metres of cable.
     

  • 20 metres of cable.
     

  • 50 metres of cable.
     

Question 7

There are n stations in a slotted LAN. Each station attempts to transmit with a probability p in each time slot. What is the probability that ONLY one station transmits in a given time slot?

  • (1-p)(n-1)

  • np(1-p)(n-1)

  • p(1-p)(n-1)

  • 1-(1-p)(n-1)

Question 8

In Ethernet when Manchester encoding is used, the bit rate is:

  • Half the baud rate.

  • Twice the baud rate.

  • Same as the baud rate.

  • None of the above

Question 9

Consider the following two statements.

  • S1: Destination MAC address of an ARP reply is a broadcast address.
  • S2: Destination MAC address of an ARP request is a broadcast address.

Which one of the following choices is correct?

  • Both S1 and S2 are true

  • S1 is true and S2 is false

  • S1 is false and S2 is true

  • Both S1 and S2 are false

Question 10

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 the 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 on going transmission is _______ .

Note -This was Numerical Type question.

  • 50

  • 150

  • 20

  • 60

There are 16 questions to complete.

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