Protocol Functions

Simple Mail Transfer Protocol (SMTP)

Standard protocol used for sending email across the internet and operates over Port 25. Only used for sending emails. Not for receiving. Insecure protocol because of plaintext. SMTPS ports 465 or 587

Post Office Protocol Version 3 (POP3)

Used to retrieve emails from a route server to a local client over port 110

Internet Message Access Protocol (IMAP)

Operates over port 143 and allows users to manage emails directly on the email server

File Transfer Protocol (FTP)

Used for transferring files between client and a server over a network. Associated with port 20 and 21

Trivial File Transfer Protocol (TFTP)

A simplified version of FTP, designed for basic file transfers, especially in environments where security and advanced features are not crucial. Port 69

Server Message Block SMB

Operates over port 445 and allows computer apps to read and write to files and request services from the server

Secure Shell ( SSH)

Protocol used for secure remote login and other secure network services over an unsecure network. Operates over port 22. For creating secure encrypted tunnel over remote based server.

Telnet

Operates over port 23. Allows a user on one computer to log in remotely to another computer.

Remote Desktop Protocol

Proprietary protocol that was developed by Microsoft to provide users with a graphical user interface to connect another computer over a network connection.

Simple Network Management Protocol (SNMP)

Used for monitoring and managing network devices. Port 161/162

Syslog

A standard protocol used for sending system log or event messages to a specific server called a syslog server. Port 514