This hour is a reasonably complete introduction to most of the networking concepts you’ll run into. However, as they say, the devil’s in the details. This hour provides a good foundation on which you can build your troubleshooting knowledge as you read on.
Here are some things to remember:
A network card acts as your computer’s telephone to the outside world. Also, it has its own unique identifier (MAC address) built in to it.
Some LANs are based on a shared bus (hub) or “party line.” As with real party lines, hurt feelings and even major disasters are caused by those who talk out of turn.
In modern networks, NICs are connected via switches for local communication— these local networks are called VLANs.
A router is used to route packets ...