Understanding Protocols and the OSI Network Model Getting a handle on the invisible part of your network—the protocols that are in use—can be of enormous value in helping you detect problems.

Because we work so much with TCP/IP nowadays, even though TCP/IP is a layer 4 stack I sometimes find myself thinking of it as the application layer.

This paper explains the 2 popular reference models: OSI reference model and TCP/IP model, by comparing the functionality of each layer in both models.

The Physical Layer: Understanding the OSI Model Understanding the OSI Model Josh Stephens is Head Geek and VP of Technology at SolarWinds, an IT management software company based in Austin, Texas.

Comparing and contrasting the OSI and TCP/IP models of networking.

What does OSI model actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

IBM misplayed its hand with SNA and OSI never had a chance against TCP/IP. The long, slow and at times, colorful battle between TCP/IP backers and SNA stalwarts was one of the more acrimonious ...

What does Ethernet and TCP/IP actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.