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Question: given the network diagram below answer the following questions assume...

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Given the network diagram below, answer the following questions. Assume that the transmission delay for HTTP GET/RESPONSE and DNS REQUEST/RESPONSE messages is so small that it can be ignored. Transmission delays are only calculated when sending the data file. Both routers, R1 and R2, use store and-forward. The transmission delays on the LANs must be calculated, but propagation delays are ignored. The round-trip time from any machine in a.com to b.com is 50 ms. The round-trip time from any machine in a.com to the Internet is 100 ms.

Authoritative DNS server b.com for b.com 100 Mbps LAN 1 Mbps full-duplex RTT 100 ms Internet 10 Mbps LAN m1.a.com m2.a.com HTTP Local cache DNS server

Give the sequence and timing of messages sent when m1.a.com requests a 1 Mbit file from www.b.com. Assume the DNS record and the HTTP file are not cached locally. Also assume that the top-level domain is not cached.

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