TRANSPORT LAYER
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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TCP retransmissions are triggered by
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timed events and duplicate acks
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timeout events and duplicate acks
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timed events and received acks
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timeout events and received acks
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Explanation:
Detailed explanation-1: -In TCP communication the “TCP dup ack” packet is sent in two possible cases: TCP segment was lost. TCP segment was delayed and received out of order at the receiver.
Detailed explanation-2: -Retransmission of the same packet is, time consuming due to increased timeout and the sender need to wait for longer time thus causing delay. Hence tcp implemented duplicate acks and the sole purpose of it is to intimate the sender before timeout occurs .
Detailed explanation-3: -In most cases, once the sender receives three duplicate acknowledgments, it will immediately retransmit the missing packet instead of waiting for a timer to expire. These are called fast retransmissions.
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