190 Chapter 11 Firewall screensNN47922-500NEW-ICQ(TCP:5190) An Internet chat program.NEWS(TCP:144) A protocol for news groups.NFS(UDP:2049) Network File System (NFS) is a client/server distributedfile service that provides transparent file sharing fornetwork environments.NNTP(TCP:119) Network News Transport Protocol is the deliverymechanism for the USENET newsgroup service.PING(ICMP:0) Packet INternet Groper is a protocol that sends out ICMPecho requests to test whether or not a remote host isreachable.POP3(TCP:110) Post Office Protocol version 3 lets a client computerreceive e-mail from a POP3 server through a temporaryconnection (TCP/IP or other).PPTP(TCP:1723) Point-to-Point Tunneling Protocol enables secure transferof data over public networks. This is the control channel.PPTP_TUNNEL(GRE:0) Point-to-Point Tunneling Protocol enables secure transferof 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 soundover the web.REXEC(TCP:514) Remote Execution Daemon.RLOGIN(TCP:513) Remote Logon.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) Simple File Transfer Protocol.SMTP(TCP:25) Simple Mail Transfer Protocol is the message exchangestandard for the Internet. SMTP enables you to movemessages from one e-mail server to another.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 dataon many different types of database systems, includingmainframes, midrange systems, UNIX systems andnetwork servers.Table 42 Predefined servicesService Description
