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What allows TCP to detect lost segments and in turn recover from that loss?

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What allows TCP to detect lost segments and in turn recover from that loss?

(a) Sequence number

(b) Acknowledgment number

(c) Checksum

(d) Both Sequence & Acknowledgment number

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Question is taken from TCP-2 topic in division Transport Layer of Computer Network

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Right option is (b) Acknowledgment number

Best explanation: TCP header contains separate fields for sequence number and acknowledgment number. Comparing these values is what allows TCP to detect lost segments and in turn recover from that loss. After detecting the lost segments, the recovery may require retransmission of the lost segments of data.

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