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By Andrew S. Tanenbaum
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Additional info for Computer Networks (4th Edition) - Problem Solutions
The best that can be achieved is 1 msec. 5 msec for the reply to get back in the best case. The best possible RPC time is then 2 msec. The conclusion is that improving the line speed by a factor of 1000 only wins a factor of two in performance. Unless the gigabit line is amazingly cheap, it is probably not worth having for this application. 18. Here are three reasons. First, process IDs are OS-specific. Using process IDs would have made these protocols OS-dependent. Second, a single process may establish multiple channels of communications.
In contrast, POP3 just sends the mailbox to the client for processing there. 23. The browser has to be able to know whether the page is text, audio, video, or something else. The MIME headers provide this information. 24. If a browser receives a page with a MIME type that it cannot handle, it calls an external viewer to display the page. It finds the viewer’s name in a configuration table, or it gets it from the user. 25. Yes, it is possible. Which helper is started depends on the configuration tables inside the browser, and Netscape and IE may have been configured differently.
For a 20-km line, the delay is 100 µsec one way and 200 µsec round trip. A 1-KB packet has 8192 bits. If the time to send 8192 bits and get the acknowledgement is 200 µsec, the transmission and propagation delays are equal. If B is the bit time, then we have 8192B = 2 × 10−4 sec. The data rate, 1/B, is then about 40 Mbps. 41. 937 MB. A 16-bit window size means a sender can send at most 64 KB before having to wait for an acknowledgement. This means that a sender cannot transmit continuously using TCP and keep the pipe full if the network technology used is Ethernet, T3, or STS-3.