GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 12

Question

Consider the sender's view of the sequence numbers in Go-Back-N protocol. Suppose the first sequence number in the sender's window is $k$, and the last sequence number in the sender's window is $k+3$. Let a packet with sequence number $i$ be $p_i$. Which of the following MUST be TRUE?

• A. $p_k$ is sent and acknowledge.
• B. $p_{k+3}$ is not sent.
• C. If $p_{k+2}$ is sent, then $p_{k+1}$ must have been sent.
• D. If $p_{k+2}$ is not sent, then $p_{k+1}$ must not have been sent.

Answer 1

we have sequence number {Pk, Pk+1, Pk+2, Pk+3} in order
as we know, in Go Back N we Send data Pack in order.
Hence if we have sent Pk+2, then we must have sent Pk+1..