Computers and Technology

Imagine a TCP session over wireless where the congestion window is fixed at 5 segments (congestion control is turned off and no fast retransmits). Segments may get lost but are not reordered. The receiver has infinite buffer and it sends an acknowledgment as soon as it receives a segment, i. e., acknowledgments are not deferred. Similarly sender transmits a segment as soon as it is allowed to. Each segment carries 1000 bytes and the time to transmit a segment is 2 ms. Assume that transmission of ACK takes negligible time. Note that the retransmission timer for a segment is started after the last bit of the segment is sent. (a) Suppose two data segments with byte sequence numbers 3000 and 15000 are lost once during the transmission. How many segments get retransmitted under each of the following conditions? A. Round trip time 100 ms, Timeout = 101 ms -> 10 B. Round trip time = 100 ms, Timeout = 152 ms -> 10 If they assume selective repeat, accept 2 retransmissions as answers for A & B
(b) Suppose acknowledgments corresponding to the above data segments are lost instead of the data segments. How many segments get retransmitted under the above conditions? A. Round trip time = 100 ms, Timeout = 101 ms -> 2 B. Round trip time = 100 ms, Timeout 152 ms -> 0 Remember that ACK is cumulative. Once the ACK for next segment arrives at the sender, the sender can stop retransmitting all the unnecessary packets.

answer
Answers: 3

Other questions on the subject: Computers and Technology

image
Computers and Technology, 21.06.2019 15:30, BreBreDoeCCx
Which of the following is step 5 to the mail merge process
Answers: 3
image
Computers and Technology, 22.06.2019 09:30, relic7391
Is a string of code written to hurt others by damaging or destroying
Answers: 1
image
Computers and Technology, 22.06.2019 16:30, mesposito
Technician a says that a dry sump system uses no oil storage sump under the engine. technician b says that a wet sump system uses no oil storage sump under the engine. who is correct?
Answers: 3
image
Computers and Technology, 23.06.2019 16:30, mirmir62
Which of the following is not an enhancement to the standard wiki to make it more attractive for corporations? encryptionwork spacespermission toolspredictive text
Answers: 2
Do you know the correct answer?
Imagine a TCP session over wireless where the congestion window is fixed at 5 segments (congestion c...

Questions in other subjects:

Konu
Mathematics, 12.06.2020 02:57