The TCP/IP protocol model is similar to the OSI model but it defines only four layers:
Application Host-to-host Internet Network access
Reference(s) used for this question: http://www.novell.com/documentation/nw65/ntwk_ipv4_nw/data/hozdx4oj… and KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 84). also see: http://en.wikipedia.org/wiki/Internet_Protocol_Suite#Layer_names_an…