MAC Layer & Channel Allocation

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Question 1

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 2

Which of the following is NOT a multiple access protocol?

  • CSMA

  • ALOHA

  • FDMA

  • IP Routing

Question 3

In CSMA/CD, what action is taken when a collision is detected?

  • Transmission continues until completion

  • Transmission stops and is retried after a random backoff time

  • The data is discarded permanently

  • The system switches to Pure ALOHA

Question 4

In CSMA, what is the key principle followed before transmitting data?

  • Wait for acknowledgment

  • Sense the channel to check if it is free

  • Transmit data immediately

  • Use time slots to avoid collisions

Question 5

What is the maximum efficiency of Slotted ALOHA?

  • 18.4%

  • 36.8%

  • 50%

  • 75%

Question 6

Slotted ALOHA improves efficiency by:

  • Assigning frequency bands

  • Forcing all stations to transmit only at slot boundaries

  •  Using dedicated channels for each user

  •  Detecting collisions before transmission

Question 7

What is the maximum efficiency of Pure ALOHA?

  • 18.4%

  • 36.8%

  • 50%

  • 75%

Question 8

Which multiple access protocol is purely random and allows stations to transmit whenever they want?

  • CSMA

  • Pure ALOHA

  • Slotted ALOHA

  • Reservation ALOHA

Question 9

In Time Division Multiplexing (TDM), how is the channel allocated?

  • Each user gets a different frequency

  • Each user gets a separate physical line

  • Each user is allocated a time slot

  • Each user uses random access

Question 10

Which channel allocation strategy divides the channel into fixed frequency bands, one for each user?

  • Time Division Multiplexing

  • Frequency Division Multiplexing

  • Code Division Multiple Access

  • Statistical Multiplexing

There are 22 questions to complete.

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