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Suppose that the last sampleRTT in a TCP connection is equal to 1 second. Then timeout for the connection will necessarily be set to a value >= 1 second.

please also give reason

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This is because, at least 1 RTT is needed for the packet to reach the destination and for acknowledgement to reach the sender's machine. So it's obvious that setting timer value less than that would result in spurious retransmission, which can ultimately result in congested network.
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This is right because in case of delayed acknowledged spurious retransmission is stoped otherwise more retransmission cause congestion in the network.

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