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Part VII
POP3 (Post Office Protocol 3) –
POP3 (Post Office Protocol 3) is the most recent version of a standard protocol for receiving e-mail. POP3 is
a client/server protocol in which e-mail is received and held for you by your Internet server. Periodically,
you (or your client e-mail receiver) check your mail-box on the server and download any mail.
PPTP (Point-to-Point Tunneling Protocol) –
PPTP extends the Point to Point Protocol (PPP) standard for traditional dial-up networking. PPTP is best
suited for the remote access applications of VPNs, but it also supports LAN internetworking. PPTP operates
at Layer 2 of the OSI model.
OSPF (Open Shortest Path First) –
Open Shortest Path First (OSPF), is a routing protocol used to determine the correct route for packets within
IP networks. It was designed by the Internet Engineering Task Force to serve as an Interior Gateway
Protocol replacing RIP.
SMTP (Simple Mail Transfer Protocol) –
SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving e-mail. However,
since it's limited in its ability to queue messages at the receiving end, it's usually used with one of two other
protocols, POP3 or Internet Message Access Protocol, that let the user save messages in a server mailbox
and download them periodically from the server.
VPN (Virtual Private Network) –
The key feature of a VPN, however, is its ability to use public networks like the Internet rather than rely on
private leased lines. VPN technologies implement restricted-access networks that utilize the same cabling
and routers as a public network, and they do so without sacrificing features or basic security.
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