Effective TCP IP Programming: 44 Tips to Improve Your by Jon C. Snader

By Jon C. Snader

An exceptional next-step for college students who've learn Stevens' TCP/IP Illustrated sequence, this booklet is designed to spice up programmers to a better point of competence by means of concentrating on the protocol suite's extra refined positive aspects and strategies. In forty-four concise, self-contained classes, this e-book bargains experience-based suggestions, practices, and principles of thumb for studying high-performance TCP/IP programming ideas. additionally, it exhibits you ways to prevent a lot of TCP/IP's commonest difficulty spots. a variety of examples display crucial rules and ideas. Skeleton code and a library of universal capabilities let you write functions with no need to fret approximately regimen chores.

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Extra info for Effective TCP IP Programming: 44 Tips to Improve Your Network Programs

Example text

There are 224 or 16,777,216 possible host IDs, but host 0 and the host ID of all ones have special meaning. The host ID of all ones is the broadcast address. I>P da tagrams addressed to the broadcast address are delivered to all hosts on the network. The host ID of 0 means ‘‘this host’’ and is used only as a source address by a host to discover its host number during start-up. For this reason, the number of hosts is always 2n − 2, where n is the number of bits in the host ID. Because the network ID is 7 bits, there are 128 possible class A networks.

It also urges that I>P addres s prefixes (that is, the network portion of the address) be assigned in a hierarchical manner to facilitate this aggregation. Hierarchical address aggregation can be likened to a hierarchical file system such as those used in UNIX and Windows. Just as higher level subdirectories know about lower level subdirectories but not about the files in those lower level subdirectories, so upper level routing domains know about intermediate domains, but not about individual networks within them.

4. This division is called classfull addressing. 4 I>P classfull addressing 22 Basics Chapter 2 Class D addresses are used for multicast addressing, and class E is reserved for future use. The remaining classes, A, B, and C, are the primary address classes used for identifying individual networks and hosts. The class of an address is identified by the number of leading 1 bits. Class A has zero leading 1 bits, class B has one, class C has two, and so on. It is critical that the class of the address be identified because the interpretation of the remaining bits depends on the class.

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