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Chapter 4: Advanced Setup Options 37
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Sample Service Port Number Table
Service Port Service Usage Protocol
113 Auth authentication Authentication
Service Protocol
53 DNS domain names Domain Name
Service
21 FTP file transfers
File Transfer
Protocol
25 SMTP send email Simple Mail
Transfer Protocol
110 POP3 read email Post Office Protocol
1723 PPTP secure
communications
Point to Point
Tunneling Protocol
23 Telnet terminal session TELNET
80 Web web access HTTP World Wide
Web
88 Kerberos authentication Kerberos
79 Finger system/user data Finger
69 tftp file transfers Trivial File Transfer
161 SNMP system
management
Simple Network
Management
Protocol
144 news newsgroups News