Application Layer

Telnet is one of the protocols that belong to the Application Layer of the Internet protocol suite (or TCP/IP protocol suite).

the application layer is the one that is used by network applications. These programs are what actually implement the functions performed by users to accomplish various tasks over the network.

Here's a list of some of the application services in this layer:

• AIM (AOL Instant Messenger Protocol)
• APPC
• AFP (Appletalk Filing Protocol)
• BitTorrent
• CFDP (Coherent File Distribution Protocol)
• FTAM
• FTP (File transfer protocol)
• gopher
• HTTP
• IMAP
• ITMS (iTunes Music Store Protocol)
• IRC (Internet Relay Chat)
• LDAP (Lightweight Directory Access Protocol)
• Modbus
• NNTP
• POP3
• SSH
• SIP (Session Initiation Protocol)
• SMTP (Simple Mail Transfer Protocol)
• SNMP (Simple network management protocol)
• TFTP (Trivial File Transfer Protocol)
• TSP (Time Stamp Protocol)
• Telnet
• X.400
• X.500
• XMPP (Extensible Messaging and Presence Protocol)

The TCP/IP protocol Suite