Basic Networking A network is two or more hosts connected together in order to exchange data. There’s two network types: WAN (Wide Area Network) - network that connects large geographical areas. LAN (Local Area Network) - network that is confined within a WAN network.

OSI Layers(Open Systems Interconnection) and associated Protocol Data Unit(PDU) OSI Model is a 7 abstract layer table that’s responsible for explaining the flow of data within a network. Experienced individuals will often call out an issue by the culprit layer number.