COMPUTER NETWORKING

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TRANSPORT LAYER

INTRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The acknowledgement number in Selective Repeat defines the sequence number of the packet
A
that is next expected.
B
that is received safe and sound.
C
that is discarded.
D
that is received and corrupted.
Explanation: 

Detailed explanation-1: -If the receiver receives a packet outside the window, it discards the packet. The receiver sends selective acknowledgments (SACKs) for packets received out of order or lost. The sender processes the SACKs to determine which packets need to be retransmitted.

Detailed explanation-2: -Design of Stop-and-Wait Automatic Repeat Request A data frames uses a seqNo (sequence number); an ACK frame uses an ackNo (acknowledgment number). The sender has a control variable, which we call Sn (sender, next frame to send), that holds the sequence number for the next frame to be sent (0 or 1).

Detailed explanation-3: -In GBN protocol, an acknowledgment for packet with sequence number n is be taken to be a cumulative acknowledgment, indicating that all packets with a sequence number up to and including n have been correctly received at the receiver.

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