Yes, it's more or less all fiber. And in that case the speed is 2/3 of the speed of light. Delay will in most part be because of distance, forwarding delay in

Yes, it's more or less all fiber. And in that case the speed is 2/3 of the speed of light. Delay will in most part be because of distance, forwarding delay in routers are a few 10's of microseconds while switches are at the sub-microsecond level. Stuff like this is quick when they have to handle 100Gbit interfaces.