An intranet is a private network that uses TCP/IP and other Internet standard protocols. Because it uses TCP/IP, an intranet can support
TCP/IP-based protocols, such as HTTP (the protocol that web browsers use to talk to
web servers), and SMTP and POP (the protocols that e-mail client programs use to
send and receive mail). An intranet can run web servers, web clients, mail servers,
and mail clients—it can work like a small, private Internet. Like the Internet, most
intranets also carry lots of e-mail traffic. Intranets
enable organizations to set up web sites and online discussion groups for their staff,
invisible to the outside world.
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