Page 754 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide

TCP/IP Model

The TCP/IP model (also called the DARPA or the DOD model) consists
of only four layers, as opposed to the OSI Reference Model’s seven.
The four layers of the TCP/IP model are Application (also known as

Process), Transport (also known as Host-to-Host), Internet
(sometimes Internetworking), and Link (although Network Interface
and sometimes Network Access are used). Figure 11.5 shows how they
compare to the seven layers of the OSI model. The TCP/IP protocol
suite was developed before the OSI Reference Model was created. The

designers of the OSI Reference Model took care to ensure that the
TCP/IP protocol suite fit their model because of its established
deployment in networking.