2.1 OSPF - clairfication and possible alternative solution
I seem to be getting stuck on semantics lately and I wanted to run another question by people.
The question asks, "Ensure that other devices running OSPF on the segment between R4 and R5 cannot intercept the OSPF communication between R4 and R5".
1) First does "segment" always mean Ethernet segment? I interpreted the question to mean both serial links and Ethernet links as R4 and R5 both share those.
2) Second the solution in the book was to move from broadcast to unicast by changing the OSPF network type. Would it also be ok to just encrypt the traffic between R4 and R5? I ended up encrypting the traffic between R3, R4 and R5 and even the virtual link. I interpreted the question to mean that if someone was sniffing the trunks (or frame-relay links) they should not be able to read the OSPF session information.