its own network or a WAN (Wide Area Network). Internet service providers lend connection to the users
and ISPs have Network Entry Point (NEP) or Point-of-Presence (POP), through which users get con-
nected to the Internet (see Figure 12.3).
The most revolutionary aspect of the Internet is its greatest diversity. Several users have different
computers with a diversifi ed operating system to communicate with one another. Thus, a communica-
tion protocol is needed that allows all these systems to be supported. The Internet is not made up of
a single type of computer system; it has a diversifi ed computer system. The communication protocol ...
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