The OSI model is a layered model that describes how information moves from an application running on one networked computer to an application running on another networked computer.

• Layer 3 – network: The network layer handles packet routing via logical addressing and switching functions. • Layer 2 – data link: Layer 2 operations package and unpack the data in frames.

When troubleshooting network issues it’s helpful to understand if the issue is occurring at Layer 2 or Layer 3 of the OSI model. If you’re able to get local communications to work but the ...