File Transfer Protocol (FTP)
A communications method for transferring data between computers on the Internet
Secure Shell (SSH)
A UNIX-based command interface and protocol for securely accessing a remote computer.
Telnet
a network protocol that allows a user on one computer to log into another computer that is part of the same network.
Simple Mail Transfer Protocol (SMTP)
The Internet standard protocol for transferring e-mail messages from one computer to another.
Post Office Protocol version 3 (POP3)
A protocol for retrieving e-mail messages from an e-mail server.
Internet Message Access Protocol version 4 (IMAP4)
Receiving e-mail from an e-mail server. Supports searching through messages stored on a server and supports using folders to organize e-mail.
Lightweight Directory Access Protocol (LDAP)
is an open protocol used to store and retrieve data from a hierarchical directory structure. Commonly used to store information about an organization and its assets and users, LDAP is a flexible solution for defining any type of entity and its qualities.