Timer

Question

When the timer restart in Go-Back-N Protocol?
and what exactly happen when a pkt loss.

Answer 1

When the timer restart in Go-Back-N Protocol?

https://www.baeldung.com/cs/networking-go-back-n-protocol
https://www.sciencedirect.com/topics/computer-science/go-back-n

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and what exactly happen when a pkt loss.

https://www.opsview.com/resources/network/blog/what-packet-loss-and-how-does-it-affect-your-network
https://www.forcepoint.com/cyber-edu/packet-loss