Question: In Automatic Repeat reQuest ( ARQ ) , why do we need to introduce timers and sequence numbers? Now, suppose the roundtrip delay between sender

In Automatic Repeat reQuest (ARQ), why do we need to introduce timers and sequence
numbers?
Now, suppose the roundtrip delay between sender and receiver is constant and known
to the sender. Would a timer still be necessary, assuming that packets can be lost?
Justify your answer.

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