How long can an ethernet cable be? (And can it be run outside?)

Ethernet cables aren't as convenient as Wi-Fi, but they're still hugely important for networks. But how long can one be, and ...
Ars Technica

New house cable homeruns all end up outside. Clever ideas?

We've just bought a new house and one of the things I noticed was there were RJ-45 jacks on the wall of most of the rooms. The realtor asked the sellers and they said they didn't know anything, they ...
Ars Technica

Questions about 1) Running PoE outside and 2) running fiber cable

Instead of posting in the UniFi Gear thread, I figured I would start my own thread since this is more generic questions about networking stuff. 1. I want to run some Ethernet cable outside of my house ...