BSCI: Interconnecting OSPF
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1. In OSPF, which best defines the characteristic of a backbone router (BR):
It acts as a firewall for the rest of the network
It has multiple interfaces in differing areas and separate link-state databases for each area
It has all its interfaces on a single area
It has at least one interface on Area 0
It has one connection to an external non-OSPF EGP network