Fig. 1: The 7-layer OSI model. Courtesy technology.blurtit.com. Fig. 2. Protocols within the layers. (Courtesy Acturus Networks) Security protocols can be implemented in just about any layer – either ...

While some people may argue that the OSI model is obsolete (due to its conceptual nature) and less important than the four layers of the TCP/IP model, Kumar says that “it is difficult to read ...

As a matter of fact, when I started writing this post I titled it “Layer 4 of the OSI Model – understanding the application layer,” and then I had to go back and correct myself.