I have to trust the dark fibre map provided, but I know exactly which way it ran, manhole to manhole. I had three cores, they shared the first 20 metres to the

I have to trust the dark fibre map provided, but I know exactly which way it ran, manhole to manhole. I had three cores, they shared the first 20 metres to the manhole, it's unlikely there would be a backhoe digging underneath the police van and pile of scaffolding that was parked in the shared conduit. After that it went on different paths to three different buildings, which from each of those was then routed independently. We take physical resilience seriously, as it isn't network engineers that do that part of the infrastructure. Enterprise network engineers then throw it all away by stacking their switches into a single point of logical failure. (Still had a non-IP backup, but sometimes that breaks too -- just in different ways than the IP)