1 votes 1 votes If initial RTT is 30 sec and new RTT is 40 sec and alpha is0.1 then calculate next two RTO time. Computer Networks tcp computer-networks transport-layer rto timers + – Kinjalkkt asked Oct 22, 2018 Kinjalkkt 459 views answer comment Share Follow See 1 comment See all 1 1 comment reply BASANT KUMAR commented Oct 31, 2018 i edited by BASANT KUMAR Nov 1, 2018 reply Follow Share we can use basic algorithm or jacobson algorithm to calculate next round trip time.i.e NRTT=$\alpha NRTT' +(1-\alpha )ARTT$ NRTT=next round trip time. ARTT=actual round trip time given NRTT'=40(previous next round trip time) ARTT=30 smotthning factor=0.1 NRTT=0.1*40+0.9*30 NRTT=6.7 1st time out =2*6.7=13.4 now second time NRTT'=6.7 ARTT=13.4 NRTT=0.1*6.7+0.9*13.4=12.73 TIME OUT=2*RTT=2*12.7=25.46 similarly for Retransmission time out we can calculate by using the formula $SRTT_{N+1}=\alpha *SRTT_{N}+(1-\alpha )*RTT_{N+1} SVar_{N+1}=\alpha *Svar_{n}+(1-\alpha )*|RTT_{N+1}-SRTT_{N+1}| NOW RTO=SRTT_{N}+4*SVAR_{N}$ SRTT=smotthning time out timer Svar=variance in RTT. 0 votes 0 votes Please log in or register to add a comment.