TCP RTT estimation and timeout value. Suppose that TCP's current estimated values for the round trip time (estimatedRTT) and deviation in the RTT (DevRTT) are 300 msec and 13 msec, respectively. Suppose that the next two measured RTTs are 330 msec and 240 msec respectively. We want to calculate TCP's RTT estimate, and the value of TCP's timeout interval. Note that given a new measured RTT, you should first compute devRTT, then estimatedRTT (the textbook incorrectly reverses those computations), and then (lastly) the timeout interval. Use the values of a = 0.125, B = 0.25. A. Following the newly measured RTT of 330 msec, what is the new value for devRTT in msec*? [Note: round your answer to the nearest msec]. B. Following the newly measured RTT of 330 msec, what is the new value for estimated RTT in msec*? Note you should use the new value of DevRTT calculated in part a. [Note: round your answer to the nearest msec, but keep your full resolution value of estimated RTT handy and use it in any later calculations you perform using estimatedRTT. Remember also to use the new value of devRTT you calculated in part a]. C. Following the newly measured RTT of 330 msec, what is the new value for TCP's timeout value in msec*? Remember to use the new values for devRTT and estimated RTT that you calculated in the previous questions and use the full 6-digit precision values you calculated (!). [Note: round your answer to this question, however, to the nearest msec]. D. Following the second measured RTT of 240 msec, what is the new value for devRTT in msec*? [Note: You'll need to use your previously calculated new values for DevRTT and estimated RTT following the measured 330 msec RTT measurement. Round your answer to the nearest msec, but keep your full resolution value of devRTT handy and use it in any later calculations you perform using devRTT.] E. Following the second measured RTT of 240 msec, what is the new value for estimated RTT in msec*? [Note: You'll need to use your previously calculated new values for DevRTT and estimated RTT following the measured 330 msec RTT measurement. Round your answer to the nearest msec.] F. Following the newly measured RTT of 240 msec, what is the new value for TCP's timeout value in msec*? Remember to use the new values for devRTT and estimated RTT that you calculated in the previous questions. [Note: round your answer to the nearest msec].

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Question 3
TCP RTT estimation and timeout value. Suppose that TCP's current estimated values for the round trip time
(estimatedRTT) and deviation in the RTT (DevRTT) are 300 msec and 13 msec, respectively. Suppose that the next
two measured RTTs are 330 msec and 240 msec respectively. We want to calculate TCP's RTT estimate, and the
value of TCP's timeout interval. Note that given a new measured RTT, you should first compute devRTT,
then estimatedRTT (the textbook incorrectly reverses those computations), and then (lastly) the timeout interval.
Use the values of a = 0.125, B = 0.25.
A. Following the newly measured RTT of 330 msec, what is the new value for devRTT in msec*? [Note: round
your answer to the nearest msec].
B. Following the newly measured RTT of 330 msec, what is the new value for estimated RTT in msec*? Note you
should use the new value of DevRTT calculated in part a. [Note: round your answer to the nearest msec, but
keep your full resolution value of estimated RTT handy and use it in any later calculations you perform
using estimatedRTT. Remember also to use the new value of devRTT you calculated in part a].
C. Following the newly measured RTT of 330 msec, what is the new value for TCP's timeout value in msec*?
Remember to use the new values for devRTT and estimated RTT that you calculated in the previous
questions and use the full 6-digit precision values you calculated (!). [Note: round your answer to this
question, however, to the nearest msec].
D. Following the second measured RTT of 240 msec, what is the new value for devRTT in msec*? [Note: You'll
need to use your previously calculated new values for DevRTT and estimated RTT following the measured
330 msec RTT measurement. Round your answer to the nearest msec, but keep your full resolution value
of devRTT handy and use it in any later calculations you perform using devRTT.]
E. Following the second measured RTT of 240 msec, what is the new value for estimated RTT in msec*? [Note:
You'll need to use your previously calculated new values for DevRTT and estimated RTT following the
measured 330 msec RTT measurement. Round your answer to the nearest msec.]
F. Following the newly measured RTT of 240 msec, what is the new value for TCP's timeout value in msec*?
Remember to use the new values for devRTT and estimated RTT that you calculated in the previous
questions. [Note: round your answer to the nearest msec].
Transcribed Image Text:Question 3 TCP RTT estimation and timeout value. Suppose that TCP's current estimated values for the round trip time (estimatedRTT) and deviation in the RTT (DevRTT) are 300 msec and 13 msec, respectively. Suppose that the next two measured RTTs are 330 msec and 240 msec respectively. We want to calculate TCP's RTT estimate, and the value of TCP's timeout interval. Note that given a new measured RTT, you should first compute devRTT, then estimatedRTT (the textbook incorrectly reverses those computations), and then (lastly) the timeout interval. Use the values of a = 0.125, B = 0.25. A. Following the newly measured RTT of 330 msec, what is the new value for devRTT in msec*? [Note: round your answer to the nearest msec]. B. Following the newly measured RTT of 330 msec, what is the new value for estimated RTT in msec*? Note you should use the new value of DevRTT calculated in part a. [Note: round your answer to the nearest msec, but keep your full resolution value of estimated RTT handy and use it in any later calculations you perform using estimatedRTT. Remember also to use the new value of devRTT you calculated in part a]. C. Following the newly measured RTT of 330 msec, what is the new value for TCP's timeout value in msec*? Remember to use the new values for devRTT and estimated RTT that you calculated in the previous questions and use the full 6-digit precision values you calculated (!). [Note: round your answer to this question, however, to the nearest msec]. D. Following the second measured RTT of 240 msec, what is the new value for devRTT in msec*? [Note: You'll need to use your previously calculated new values for DevRTT and estimated RTT following the measured 330 msec RTT measurement. Round your answer to the nearest msec, but keep your full resolution value of devRTT handy and use it in any later calculations you perform using devRTT.] E. Following the second measured RTT of 240 msec, what is the new value for estimated RTT in msec*? [Note: You'll need to use your previously calculated new values for DevRTT and estimated RTT following the measured 330 msec RTT measurement. Round your answer to the nearest msec.] F. Following the newly measured RTT of 240 msec, what is the new value for TCP's timeout value in msec*? Remember to use the new values for devRTT and estimated RTT that you calculated in the previous questions. [Note: round your answer to the nearest msec].
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