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Slotted ALOHA Network Efficiency Quiz

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Questions and Answers

What is the maximum channel utilization in ALOHA?

12%

30%

25%

18% (correct)

In ALOHA, what does a station do if it fails to receive an acknowledgment after repeated transmissions?

Sends an error message

Transmits immediately

Increases the frame length

Gives up (correct)

What is the vulnerable time for slotted ALOHA protocol?

Equal to the frame length

2 slot times

Equal to the round-trip propagation delay

1 slot time (correct)

How long does a sender wait for an acknowledgment in ALOHA?

Equal to the round-trip propagation delay Signup and view all the answers

What is the procedure for retransmission if no acknowledgment is received in ALOHA?

Wait for a fixed amount of time before resending Signup and view all the answers

How is channel utilization defined?

Percentage of frames that arrive successfully without collisions Signup and view all the answers

What happens if a station fails to receive an acknowledgment after repeated transmissions in ALOHA?

Give up after a number of attempts Signup and view all the answers

How does the vulnerable time affect the efficiency of slotted ALOHA?

-Decreases efficiency Signup and view all the answers

What happens if a sender does not receive an acknowledgment within the vulnerable time in slotted ALOHA?

Wait for a fixed duration before retransmission Signup and view all the answers