Computer-Networks

Question 38

Consider three IP networks A, B and C. Host H_A in network A sends messages each containing 180 bytes of application data to a host H_C in network C. The TCP layer prefixes a 20 byte header to the message. This passes through an intermediate network B. The maximum packet size, including 20 byte IP header, in each network is:

     A : 1000 bytes 
     B : 100 bytes 
     C : 1000 bytes

The network A and B are connected through a 1 Mbps link, while B and C are connected by a 512 Kbps link (bps = bits per second).

What is the rate at which application data is transferred to host H_C? Ignore errors, acknowledgements, and other overheads.

A	325.5 Kbps
B	354.5 Kbps
C	409.6 Kbps
D	512.0 Kbps

Computer-NetworksIPv4-and-TCPGATE 2004

Question 38 Explanation:

H_C will receive 260 bytes in which only 180 bytes are of application data.
Application data is transferred at rate of (180/260) x 512 Kbps = 354.46 Kbps

Correct Answer: B

Question 38 Explanation:

H_C will receive 260 bytes in which only 180 bytes are of application data.
Application data is transferred at rate of (180/260) x 512 Kbps = 354.46 Kbps