[graealex]

What's everyone here talking about?

The absolute low-tech solution would be to dedicate a switch for it.

If you have decent infrastructure with a managed switch, you can easily create a VLAN.

Besides the fact that the female RJ45 is usually inside the dwelling. You'd have to unmount the camera, pull out the cables and connect to it, all at typical heights of 6' and above. That's maybe a concern in commercial setups, although then we're circling back to VLAN.