network

I am in the process of cleaning up my cables and as part of it testing all connections. One cat5e wire that snakes thru the walls and I can NOT replace as it's not going to pull around the bends, is showing what seems like a short according to my simple tester. It goes thru wire 1, 2, 3, 4...

I am in the process of rewiring my basement and trying to route all my cables using J-Hooks along the rafters in my semi walk in crawlspace. This includes running the cables to my new server rack. Problem I have is contrary to my request to have the power plugs up in the rafters, electrician...