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Station A needs to send a message consisting of 9 packets to Station B using a sliding window (window size 3) and goback-n error control strategy. All packets are ready and immediately available for transmission. If every 5th packet that A transmits gets lost (but no acts from B ever get lost), then what is the number of packets that A will transmit for sending the message to B?
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- 12
- 14
- 16
- 18
- 12
Correct Option: C
Total 16 packets are sent. See following table for sequence of events. Since go-back-n error control strategy is used, all packets after a lost packet are sent again.