6.1.6 - Common TCP and UDP Ports

These flashcards cover the common TCP and UDP ports, their associated protocols/applications, and their port numbers.

FTP

File Transfer Protocol, uses port 21 for control and port 20 for data.

SSH/SFTP

Secure Shell/File Transfer Protocol over SSH, typically uses port 22.

Telnet

A protocol used for remote access, operates on port 23.

SMTP

Simple Mail Transfer Protocol, uses port 25 for sending emails.

DNS

Domain Name System, operates on port 53, can use TCP or UDP.

DHCP

Dynamic Host Configuration Protocol, uses ports 67 (server) and 68 (client), works over UDP.

HTTP

Hypertext Transfer Protocol, communicates over port 80.

POP3

Post Office Protocol version 3, listens on port 110.

NTP

Network Time Protocol, operates on port 123 using UDP.

IMAP

Internet Message Access Protocol, uses port 143.

SNMP

Simple Network Management Protocol, operates on port 161 for general communication and port 162 for traps.

LDAP

Lightweight Directory Access Protocol, uses port 389.

HTTPS

HTTP Secure, a secured version of HTTP on port 443.

SMB

Server Message Block, communicates over port 445.

Syslog

Protocol used for logging system messages, operates on port 514.

SIP

Session Initiation Protocol, can use ports 5060 (standard) and 5061 (secure).