Download How Networks Work Millennium Edition by Frank J. Derfler, Les Freed, Frank Derfler PDF

By Frank J. Derfler, Les Freed, Frank Derfler

For introductory and common networking classes. How Networks paintings, Millennium version is an entire colour, illustrated advisor on networking know-how. This booklet offers the basics of networking with precise photographs that illustrate those thoughts. scholars will locate tricky networking ideas defined in an easy-to-understand structure.

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Many of those systems are still in use today. One of the major developments of the 1960s in computing technology was the concept of time-sharing. A time-sharing system allows more than one user—often as many as several hundred—to use the same computer simultaneously. Users could run their own programs, and each user interacted with the computer using a terminal. Most of these early mainframe terminals were mechanical teletypewriter-type units. By the mid-1970s, the video display terminal (VDT) had replaced printing terminals for many applications.

Today's public telephone network is a complex maze of telephone lines and central switching offices. The central offices connect to an even more complicated web of cables, microwave towers, fiber-optic cables, and communications satellites. At one time, more than 90 percent of these facilities belonged to the Bell system. Since the courtordered AT&T breakup in 1984, the facilities belong to dozens of companies, including AT&T, the regional Bell operating companies, MCI, GTE, and others. Despite all the behind-the-scenes complexity, the system remains easy to use.

Unlike ISDN, DSL provides a single data channel, and that data channel is a dedicated point-to-point circuit, usually used to connect a home or office directly to an Internet service provider. There are several incompatible varieties of DSL, but the key DSL providers and equipment vendors are working on a common standard. DSL speeds range from 384Kbps up to several megabits per second. Page 65 This page intentionally left blank. Page 66 Cable Modems Cable modems deliver multimegabit speeds by using your local cable company's cable TV network.

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