Similarities of the OSI and TCP/IP models:

• Both have layers
• Both have application layers, though they include very different services
• Both have comparable transport and network layers
• Packet-switched, not circuit-switched, technology is assumed
• Networking professionals need to know both models

Differences of the OSI and TCP/IP models:

• TCP/IP combines the presentation and session layer into its application layer
• TCP/IP combines the OSI data link and physical layers into one layer
• TCP/IP appears simpler because it has fewer layers
• TCP/IP transport layer using UDP does not always guarantee reliable delivery of packets as the transport layer in the OSI model does

The Internet is developed by the standards of the TCP/IP protocols. The TCP/IP model gains credibility because of its protocols. In contrast, networks typically are not built on the OSI protocol. The OSI model is used as a guide for understanding the communication process.

Interactive Media Activity Drag and Drop: Comparing the TCP/IP and OSI Model After completing this activity, the student will be able to identify the differences between the TCP/IP model and OSI model.

   

Web Links Introduction to TCP/IP http://www.snnug.com/meetings/tcpip.htm