CISSP: Ports and Protocols

•       Telnet, TCP Port 23 supports remote connectivity to execute commands and running applications but does not support transfer of files

•       FTP, TCP Ports 20 (Passive Data)/Ephemeral (Active Data) and 21 (Control Connection)

•       TFTP, UDP Port 69 Exchange of files that does not require authentication

•       SMTP, TCP Port 25

•       Post Office Protocol (POP3), TCP Port 110

•       IMAP, TCP Port 143 IMAP is more secure than POP3

•       HTTP, TCP Port 80

•       DHCP, UDP Ports 67 and 68. 67 as the destination port on the server to receive client communications and port 68 as the source port for client requests

•       DNS: TCP port 53 for zone transfers, UDP port 53 for DNS queries

•       SSL, TCP Port 443

•       Line Print Daemon (LPD), TCP Port 515used to spool print jobs

•       X Window, TCP Ports 6000–6063 GUI API for command-line operating systems

•       NTP, TCP port 123

•       LDAP: Port 636 (secure), 389 (unsecure)

•       Global directory: Port 3269 (secure), 3268 (unsecure)

•       Diameter: TCP Port 3868

•       NFS, TCP Port 2049 supports file sharing between dissimilar systems

•       SNMP, UDP Port 161 (UDP Port 162 for Trap Messages)collects network health and status

•       RADIUS: UDP 1812 port. TCP 2083 over TLS

•       Windows File Sharing: 135, 137-139, 445; 

•       Microsoft SQL Server: 1433/1434; 

•       Oracle: 1521; 

•       H.323 1720; 

•       PPTP: 1723; 

•       L2TP UDP 1701; 

•       HP JetDirect Printing: 9100; 

•       RIP UDP 520 


Reference: Mike Chapple. “(ISC)2 CISSP Certified Information Systems Security Professional Official Study Guide.”