Q.6. Consider the file transmissions carried out over TCP as shown in the figure
ID: 3703938 • Letter: Q
Question
Q.6. Consider the file transmissions carried out over TCP as shown in the figure. RTT-30msec Host A 1 Gbps 100Mbps 100Mbps Router 1 Router 2 Network Interface 100Mbps ections 995 TCP leave Router 2 Host S nnections ctions Host B r Router 1 Network 1 Network 2 Host A and Host B are downloading large files from Host S. The application on Host A opens a single TCP connection for this transfer. The application on Host B opens 4 parallel TCP connections. Assume that Host S does not send data to any other host. Both Host A and Host B download the files in 500Byte fixed size segments. The Round trip time (RTT) between either of these hosts and Host S is 30msec and it stays constant during the transfer Assume that the time out values are long enough such ta ime out does not happen. In addition to the TCP connections between Host A-Host S and Host B-Host S there are 995 other TCP connections running on the link from R1 to R2 which has Gbps capacity a) What is the average download rate achieved at Host A and Host B? b) What is the utilization of the transmitter at the network interface of Host S? cWhat is the expected maximum number of segments in the sender window for any of the TCP connections on Host S?
Explanation / Answer
Solution:
a)
SInce router 2 is providing 100Mbps
so the average rate on A and B will be 50Mbps.
b)
The utilization is 100%
c)
The maximum number of segments depends on the size of the segment
Expected number can be 10 segments for TCP connections only.
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