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In TCP we use single retransmission timer (associated with oldest unacknowledged segment) or multiple timers(one for each unacknowledged segment)?

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The value of retransmission timeout keeps on updating as per the formula RTT= SRTT+4 RTTvar with every segment sent. Hence a single retransmission timer works .

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dd asked Dec 8, 2016
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If initial_RTT is not given or nothing mentioned about Dev_RTT ...is it ok to follow this method ?? Or no need to consider Dev_RTT at all (just $RTO = 2* ERTT$ ???)Here $...