Understanding the OSI (Open Systems Interconnection) model layers is the key to successfully troubleshoot and resolve security issues. The 7 layers of the OSI model – Application, Presentation, Session, Transport, Network, Data link and Physical layers each relate to different network communication processes. Security risks are faced up and down the stack.

Physical Layer

A great starting location for troubleshooting issues in the network is the physical layer. It is also the logical starting point for security. Layer 1 has various cables, hubs, modems and wireless access points.… Read the rest