Internet Service Providers, Application Service Providers and Portals

Internet service providers (ISPs) sell Internet access, domain registration, email, Web page hosting, Web page design and other Internet services such as security for extranets (discussed later in this chapter). Examples of Internet service providers are Genuity, WorldCom, Sprint, AT&T WorldNet, MindSpring, NetZero, Excite@Home and Road Runner.

ISPs support both dialup and dedicated Internet access. Dialup access is either analog plain old telephone service (POTS) or ISDN digital dialup. ISDN is a digital service that provides two telephone lines for either voice or data plus a signaling link all over one pair of wires. (See Chapter 6.) Examples of dedicated services are cable ...

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