Go-Back-N
Go-Back-N ARQ is the sliding window protocol with wt>1, but a fixed wr=1. The receiver refuses to accept any packet but the next one in sequence. If a packet is lost in transit, following packets are ignored until the missing packet is retransmitted, a minimum loss of one round trip time. For this reason, it is inefficient on links that suffer frequent packet loss.
Read more about this topic: Sliding Window Protocol, Examples