Direction: Consider three IP networks A, B and C. Host HA in networks A sends message each containing 180 byte of application data to a host HC 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 byte
B : 100 byte
C : 1000 byte
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).
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Assuming that the packets are correctly delivered, how many bytes, including headers, are delivered to the IP layer at the destination for one application message, in the best case? Consider only data packets.
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- 200
- 220
- 240
- 260
- 200
Correct Option: D
Size of message sent by network A = 180 byte The size received by B = 100 Byte Now, in the best considered case, The only possible combination is
(20 + 80) + (20 + 80) + (20 + 40) = 260 Byte
