What action results from a failure to exchange information due to excessive transmission attempts when using an ARQ mode?
Why ARQ stands for Automatic Repeat reQuest: the receiving station acknowledges good blocks and asks for a resend of any block that fails its error check. Each block has a retry limit, and if the sending station exhausts those attempts without a valid acknowledgment, the protocol gives up and the link times out, dropping the connection. This is what keeps a dead or hopeless path from tying up the channel with endless repeats.
Watch out Checksums are simply compared, not accumulated, so nothing overflows, and misrouted packets describe an addressing or network problem rather than a failed handshake on a point-to-point ARQ link.
ARQ = Automatic Repeat reQuest. Too many repeats with no ACK and the link just hangs up.