Register

Applied Test Series

1,690 views
3 votes
3 votes
Suppose TCP uses congestion control without slow start.The first transmission start with 1 MSS,  Assuming cwnd increases by 3 MSS every time a batch of ACKs is received and assuming approximately constant round-­?trip times, the next window after timeout will be the the size of new threshold,  if timeout occurs at the sixth transmission, how many total round trip time requires to reach the window size of 20 MSS.
User Avatar

1 Answer

Best answer
3 votes
3 votes 
First transmission = 1 MSS

Second transmission= 4 MSS

Third transmission = 7 MSS

Fourth transmission= 10 MSS

Fifth transmission= 13 MSS

Sixth transmission= 16 MSS [ Timeout, New th = 16 / 2 = 8 MSS]

Seventh transmission = 8 MSS

Eight transmission= 11 MSS

Ninth transmission= 14 MSS

Tenth transmission= 17 MSS

 

At the end of the tenth transmission, the window size reaches 10 MSS

So 10 RTTs are required.

• selected by
User Avatar
Voting & Accepting an answer helps improve the community
← PreviousNext →
← Previous in categoryNext in category →

Related questions

2 votes
2 votes
2 answers
1
LRU asked Oct 8, 2021
1,039 views
Applied Test Series
In the TCP connection, the maximum segment size used by the connection is 1000 bytes. What is the congestion window(in bytes) after the 4th transmission and receives acks for all of them? Assume the connection uses only slow-start ?
In the TCP connection, the maximum segment size used by the connection is 1000 bytes. What is the congestion window(in bytes) after the 4th transmission and receives acks...
User Avatar
2 votes
2 votes
1 answer
2
LRU asked Oct 8, 2021
1,576 views
Applied Test Series
Suppose TCP uses AIMD for its congestion control without slow start. Assuming cwnd increases by 2 MSS every time a batch of ACKs is received and assuming approximately constant round-trip times, how long in round trip time does it take for cwnd to increase from 4 MSS to 12 MSS (assuming no loss events)?
Suppose TCP uses AIMD for its congestion control without slow start. Assuming cwnd increases by 2 MSS every time a batch of ACKs is received and assuming approximately co...
User Avatar
2 votes
2 votes
1 answer
3
LRU asked Oct 4, 2021
559 views
Applied Test Series
Consider the size of the congestion window of a TCP connection be 40 KB when a timeout occurs. The round trip time of the connection is 50 msec and the maximum segment size used is 2 KB. How much time it will be required(in milli sec) to reach the congestion window of 30 KB?
Consider the size of the congestion window of a TCP connection be 40 KB when a timeout occurs. The round trip time of the connection is 50 msec and the maximum segment si...
User Avatar
Link Copied!