Question

In Go-Back-N ARQ, if frames 4, 5, and 6 are received successfully, the receiver may send an ACK _____________
to the sender.
a. 6
b. 7
c. 5
d. any of the above​

Answer 1

Answer:

In Go-Back-N ARQ, if frames 4, 5, and 6 are received successfully, the receiver may send an ACK 7 to the sender.

Explanation:

Step 1: In Go-Back-N ARQ, the transmitter window size is "N," while the receiver window size is "1." The whole window, beginning with the corrupted frame, is retransmitted when the sender's acknowledgment for one frame is not received or the frames the receiver receives are out of sequence.

Step 2:  The transmit window size in Go-Back-N ARQ must be less than 2m, but the receiver window size is always 1. The size of the transmit window in Stop-and-Wait ARQ, a particular instance of Go-Back-N ARQ, is 1. The transmitter and receiver windows in Selective Repeat ARQ must have a maximum size of 1.5 m.

Step 3: With a transmit window size of N and a receive window size of 1, it is a particular instance of the basic sliding window protocol. N frames can be sent to the peer before an ACK is necessary. The receiver process records the sequence number of the following frame it anticipates receiving.

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Answer 2

Answer:

If frames 4, 5, and 6 are properly received in a Go-Back-N ARQ, the receiver may transmit an ACK 7 to the sender.

Explanation:

The transmitter window size in Go-Back-N ARQ is "N," whereas the receiver window size is "1." When the sender's acknowledgment for one frame is not received or the frames the receiver receives are out of order, the entire window—starting with the corrupted frame—is retransmitted.

Step 2: In Go-Back-N ARQ, the broadcast window size must be smaller than 2m, while the receiver window size is always 1. In Stop-and-Wait ARQ, a specific type of Go-Back-N ARQ, the transmit window size is 1. There must be a maximum size for the transmitter and receiver windows in selective repeat ARQ.

With a transmit window size of N and a receive window size of 1, it is a particular instance of the basic sliding window protocol. N frames can be sent to the peer before an ACK is necessary. The receiver process records the sequence number of the following frame it anticipates receiving.

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