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Computer Networking Chapter 2: Network Categories and OSI Architecture

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Questions and Answers

What is the main advantage of Go-Back-N ARQ protocol over Selective Repeat ARQ?

Simplifies the process at the receiver site.

Why is Go-Back-N ARQ protocol bandwidth inefficient?

Because it discards out-of-order frames and resends all frames from the damaged frame onwards.

What is the purpose of a negative ACK (NAK) in Selective Repeat ARQ?

To report the sequence number of a damaged frame before the timer expires.

In Selective Repeat ARQ, what happens when a frame is received out of order?

The receiver sends a NAK to report the missing frame and the sender resends only the missing frame. Signup and view all the answers

What is the maximum size of the sender and receiver windows in Selective Repeat ARQ?

One-half of 2 m, where m is the number of bits in the sequence number. Signup and view all the answers

What happens if the window size is larger than 2 m /2?

The sender may resend duplicate frames, causing errors at the receiver. Signup and view all the answers

Why is Selective Repeat ARQ more bandwidth efficient than Go-Back-N ARQ?

Because it only resends the damaged frame, rather than all frames from the damaged frame onwards. Signup and view all the answers

What is the main disadvantage of Selective Repeat ARQ?

It requires more complex processing at the receiver. Signup and view all the answers

In what situation would Go-Back-N ARQ be a better choice than Selective Repeat ARQ?

In situations where the receiver has limited processing power or memory. Signup and view all the answers

What is the purpose of the receiver window in Selective Repeat ARQ?

To specify the range of frames that the receiver is expecting to receive. Signup and view all the answers

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