Your IT Director has been reading again. He has decided that he wants to convert the network to
OSPF, but he is having some difficulty with terminology. He knows that an OSPF router can serve
one of four roles. His problem is that he cant remember which role exists when one of the routers
interfaces is on the backbone area. Help him out.

Which of the following is it?

A.
Internal router

B.
Area border router

C.
Backbone router

D.
Autonomous system boundary router