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Chapter 16 of: Understanding Data Communications: From by Gilbert Held

By Gilbert Held

Now in its 3rd version, knowing info Comunications, offers a finished advent to the sector of knowledge communications for either scholars and pros. Assuming no past wisdom of the sector, it offers an summary of the function of communications, their value, and the basic recommendations of utilizing the ISO's 7-layer method of current a number of the facets of networking.* Covers the evolving excessive velocity community entry through electronic subscriber line, cable modems and instant communication.* Examines the function of regulatory and standardization our bodies, the operation of the web and using various digital applications.* encompasses a sequence of entire questions protecting the $64000 techniques from every one section.* Describes the electronic community utilized by communications companies and the tools used to procure entry to the electronic highway.* Discusses frequency department multiplexing which types the root for the operation of different types of excessive velocity electronic subscriber line.Aimed on the senior point undergraduate and graduate machine technological know-how pupil, it's also crucial studying for information processing execs and people inquisitive about machine technological know-how and knowledge communications.

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The reason a host address of 255 cannot be used is that it represents a setting of all ones, which denotes a broadcast address. 26 two hosts are shown connected to another network. Note that the first byte for the four-byte dotted-decimal number assigned to each host and the router port is decimal 226, which is equivalent to binary 11100010. Since the first two bits in the first byte are again set to 11, the second network also represents the use of a Class C address. 254. 26 Router connections to networks require an IP address for each connection 672 NETWORK ARCHITECTURE portion field of an IP address has two restrictions.

This dotted decimal notation represents a 32-bit address. Since numerical addresses are difficult to work with, TCP/IP also supports a naming convention based on mnemonics which are described later in this section. The conversion of mnemonic names to IP addresses represents one of two key functions performed by DNS. The second key function is to provide a pointer to a higher authority beyond a local network when a destination address is not on the local network. The method by which this is accomplished is also described later in this section.

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