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			Appendix E Services
Table 83 Examples of Services (continued)
NAME	PROTOCOL	PORT(S)	DESCRIPTION
POP3	TCP	110	Post Office Protocol version 3 lets a
			client computer get e-mail from a
			POP3 server through a temporary
			connection (TCP/IP or other).
POP3S	TCP	995	This is a more secure version of POP3
			that runs over SSL.
PPTP	TCP	1723	Point-to-Point Tunneling Protocol
			enables secure transfer of data over
			public networks. This is the control
			channel.
PPTP_TUNNEL	User-Defined	47	PPTP (Point-to-Point Tunneling
(GRE)			Protocol) enables secure transfer of
			data over public networks. This is the
			data channel.
RCMD	TCP	512	Remote Command Service.
REAL_AUDIO	TCP	7070	A streaming audio service that
			enables real time sound over the web.
REXEC	TCP	514	Remote Execution Daemon.
RLOGIN	TCP	513	Remote Login.
ROADRUNNER	TCP/UDP	1026	This is an ISP that provides services
			mainly for cable modems.
RTELNET	TCP	107	Remote Telnet.
RTSP	TCP/UDP	554	The Real Time Streaming (media
			control) Protocol (RTSP) is a remote
			control for multimedia on the
			Internet.
SFTP	TCP	115	The Simple File Transfer Protocol is an
			old way of transferring files between
			computers.
SMTP	TCP	25	Simple Mail Transfer Protocol is the
			message-exchange standard for the
			Internet. SMTP enables you to move
			messages from one e-mail server to
			another.
SMTPS	TCP	465	This is a more secure version of SMTP
			that runs over SSL.
SNMP	TCP/UDP	161	Simple Network Management
			Program.
SNMP-TRAPS	TCP/UDP	162	Traps for use with the SNMP
			(RFC:1215).
SQL-NET	TCP	1521	Structured Query Language is an
			interface to access data on many
			different types of database systems,
			including mainframes, midrange
			systems, UNIX systems and network
			servers.

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