Memorize - Well known Port Numbers

Posted Sun, 2013-06-23 22:16 by chaney

While there are over 65,000 possible ports, chances are you will need to know a handful for the exam as well as your daily life as a CISSP. Here are some common ones to be aware of:

  • 20,21 - FTP, File Transfer Protocol
  • 22 - ssh, secure shell
  • 23 - Telnet
  • 25 - SMTP, Simple Mail Transport Protocol
  • 53 - DNS
  • 69 - TFTP, Trivial File Transfer Protocol
  • 80 - HTTP, HyperText Transfer Protocol
  • 110 - POP3, Post Office Protocol (version 3)
  • 119 - NNTP, Network News Transport Protocol
  • 124 - NTP, Network Time Protocol
  • 143 - MAP, Internet Message Access Protocol (version 4)
  • 161 - SNMP, Simple Network Management Protocol
  • 3389 - RDP, Remote Desktop Protocol
  • 6000- X-Windows