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Appendix F Service Acronyms
IMAP, IMAPv3
Internet Message Access Protocol. Protocols for retrieving E-mail messages.
IMAP uses TCP 143; IMAPv3 uses TCP 220.
IPSEC IKE, IPSEC ESP
IP Security. Protocols which support the secure exchange of packets at the
IP layer. Uses UDP 500.
LDAP
Lightweight Directory Access Protocol. A set of protocols for accessing informa-
tion directories. Uses TCP 389.
MICROSOFT-DS, -GC
-DS uses UDP 445 and TCP 445; -GC uses TCP 3268.
NETBIOS-NS, -DGM, -SSN
Network Basic Input Output System. Three types of DOS BIOS augmentation
which add functions for local area networks (LANs). -NS uses UDP 137 and TCP
137; -DGM uses UDP 138; -SSN uses TCP 138.
NNTP
Network News Transfer Protocol. A protocol used to distribute and retrieve
news articles over the Internet. Uses TCP 119.
POP3
Post Office Protocol 3. Another protocol used to transfer E-mail between
computers. Usually employs a pop3 server, and is used to receive mail only. Uses
TCP 110.
PROFILE
Uses TCP 136.