Student or Learner
dears in this sentence
whereas at least 80% of the trafﬁc is expected to travel off the
local network and across the backbone.
i don't understand travel off (i don't found it in dictionary)
I'm not a teacher...
The subject is 'the local network'.
So, network traffic is either ON the local network, or OFF of the local network.
The speaker is saying that about 20% of the network traffic will be on the local network. The other 80% will be OFF of the local network - on the backbone instead.