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Appendix F Firewall Security
Service Acronym Definitions
http
HyperText Transfer Protocol This protocol delivers information over the
Internet, and is used when a computer connects to a Web site via an Internet
browser
dns
Domain Name System. A data query system used to translate host names into
Internet addresses (i.e., www.somewebsite.com translates to 888.999.000.111)
ftp
File Transfer Protocol. A protocol used to transfer files over the Internet.
telnet
An Internet communications protocol enabling one computer to function as a
terminal working from another (remote) computer.
smtp
Simple Mail Transfer Protocol. A protocol used to transfer E-mail between com-
puters over the Internet. Can be used to send and receive mail.
pop3
Post Office Protocol 3. Another protocol used to transfer E-mail between com-
puters. Usually employs a pop3 server, and is used to receive mail only.
nntp
Network News Transfer Protocol. A protocol used to distribute and retrieve
news articles over the Internet.
real audio/video
A protocol used to transfer Real Audio or Real Video files.
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