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Extra info for Computer Networks (4th Edition) - Problem Solutions

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It must be done on the server by using PHP. (c) Both work, but JavaScript is faster. 38. There are obviously many possible solutions. Here is one. form)">

Clearly, this can be improved in various ways, but these require a bit more knowledge of JavaScript. PROBLEM SOLUTIONS FOR CHAPTER 7 39 39. com Note the blank line at the end. It is mandatory. 40. Most likely HTML pages change more often than JPEG files. Lots of sites fiddle with their HTML all the time, but do not change the images much.

21. Each sample occupies 4 bytes. This gives a total of 256 samples per packet. There are 44,100 samples/sec, so with 256 samples/packet, it takes 44100/256 or 172 packets to transmit one second’s worth of music. 22. Sure. The caller would have to provide all the needed information, but there is no reason RTP could not be in the kernel, just as UDP is. 23. No. A connection is identified only by its sockets. Thus, (1, p) – (2, q) is the only possible connection between those two ports. 32 PROBLEM SOLUTIONS FOR CHAPTER 6 24.

21. Storing users’ e-mail takes up disk space, which costs money. This factor argues for using POP3. On the other hand, the ISP could charge for disk storage above a few megabytes, thus turning e-mail into a moneymaker. The latter argues for IMAP to encourage users to keep e-mail on the server (and pay for disk space). 22. It does not use either one. But it is fairly similar in spirit to IMAP because both of them allow a remote client to examine and manage a remote mailbox. In contrast, POP3 just sends the mailbox to the client for processing there.

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