Networking Basics

Part of the Linux course

"The site is down." You open it and it works fine from your laptop but not from the server. Somewhere between the two machines, something is wrong, and "the network" is a big place to go looking. The good news is that almost every network problem is one of four questions, and each question has one command that answers it. This lesson gives you those commands.

Before the commands, hold the shape of the problem in your head. A request from your machine to a server has to clear four hurdles, in order: