The Open System Interconnection (OSI) Model

LayerExample
Application LayerTelnet, SSH, FTP, SMTP, HTTP, NFS, SNMP
Presentation LayerJPG, PNG, GIF, MPEG, ASCII, CSS, HTML
Session LayerRPC, SCP, TLS
Transport LayerTCP, UDP
Network LayerIP V4, IP V6, ICMP, IPsec
Data Link LayerMAC, PPP, ATM, HDLC, Frame Relay
Physical LayerEthernet, ISDN, USB, DSL

What is Telnet?

a network protocol that allows a user on one computer to log into another computer that is part of the same network.

What is SSH?

SSH, also known as Secure Shell or Secure Socket Shell, is a network protocol that gives users, particularly system administrators, a secure way to access a computer over an unsecured network.

What is FTP?

The File Transfer Protocol (FTP) is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network.

What is SMTP?

Simple Mail Transfer Protocol.

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