Ccna routing and Switching Complete Study Guide

Differentiate between the DoD and the OSI network models.    The DoD model is a 

condensed version of the OSI model, composed of four layers instead of seven, but is 

nonetheless like the OSI model in that it can be used to describe packet creation and devices 

and protocols can be mapped to its layers.

Identify Process/Application layer protocols.    Telnet is a terminal emulation program 

that allows you to log into a remote host and run programs. File Transfer Protocol (FTP) 

is a connection-oriented service that allows you to transfer files. Trivial FTP (TFTP) is a 

connectionless file transfer program. Simple Mail Transfer Protocol (SMTP) is a sendmail 

program.