derive the equation for retransmission time out interval justify the need of devrtt in the derived equation
Answers
derive the equation for re transmission time out interval justify the need of devrtt in the derived equation
Explanation:
Re transmission Timer – To re transmit lost segments, TCP uses re transmission timeout (RTO). When TCP sends a segment timer starts and stops when the acknowledgment is received. If timer expires timeout occurs and the segment is re transmitted. RTO (re transmission timeout is for 1 RTT) to calculate re transmission timeout we first need to calculate the RTT (round trip time).
Equation to calculate RTT Timeout interval
Re transmission Timeout: RTO calculation – The value of RTO is based on the smoothed round-trip time and its deviation. Most implementations use the following formula to calculate the RTO:
Initial value -> Original (given in question)
After any measurement -> RTO=RTTs + 4*RTTd
At every re transmission the value of RTO doubles. (RTO(new) = RTO (before re transmission) *2) this is explained in Karn’s Algorithm