Fast, cheap, and easy to build. No soldering needed.
You need a wired home network for gigabit speed.
This little gadget will help you find both ends of your network wiring when you have a bundle of wires coming together in the basement.
It sends a pulsed 90+ volt DC signal down your CAT5 and other wires so it can give you a startling, but harmless shock if you touch the leads.
Step 1: Parts
You will also need a package of alligator clips, also about a dollar.
Get a neon voltage tester for a dollar while you are there.