There are two theoretical models used to describe the way networking should work.

Candidates who will be taking the following exams will need this study guide to learn these two networking models:

  • Cisco CCNA
  • Cisco CCNP
  • Juniper JNCIA-Junos
  • CompTIA Network+

OSI Model

The first network model called the OSI Model is both a theoretical model, and a practical model of the OSI Networking Protocols based on the concepst of abstracting behaviors and providing standardized interfaces between layered technologies.

As the OSI protocols are not used in the global Internet, we will only show the theory of the OSI model as it pertains to networking in general.

Read more: The complete OSI Model Tutorial

TCP/IP Model

The second model, the TCP/IP Model, directly reflects the actual networking protocols used in the Internet and illustrates the basic operation and interactions between IP and TCP. This model is only a practical model based on layered theory.

Read More: The complete TCP/IP Model Tutorial

Comparison of the TCP/IP Model and OSI Model

The two models provide similar concepts of layering and abstraction, but organize functions differently.

Read More: Comparison of TCP/IP model and the OSI model of networking


  1. Internet Tutorials
  2. TCP/IP protocols
  3. Networking Tutorials
  4. Internetworking



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