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Unit 9 · Data Communication and Computer Networks Paper 2 CS · December 2022 Shift 1

In the Go-Back-N protocol, Sf (first outstanding packet) = 3 and Sn (next packet to send) = 7. After receiving the packet with AckNo = 6, the value of Sn is ______

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Correct answer: B. 7

Explanation

A cumulative ACK 6 slides Sf to 6. Sn (the next new packet to send) is unchanged at 7.

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