The four routers in the exhibit are participating in a multi-area OSPF topology.
Node B (in the upper right-hand corner) is an ASBR advertising an external route.
Node A (lower left-hand corner) receives the external route and begins to forward traffic to the ASBR.
How many hops will the packets take through this topology? (Do not count node A.)
A.
2
B.
3
C.
4
D.
5
Can someone explain why it takes 4 hops? Why not take the shortest path with the lowest cost by going across the link with metric 10 and 1 hop instead the longest and most expensive path?
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OSPF will choose routes in the following order:
Intra-Area (O)
Inter-Area (O IA)
External Type 1 (E1)
External Type 2 (E2)
NSSA Type 1 (N1)
NSSA Type 2 (N2)
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Router3 is only ABR that can advertise LSA4, so traffic has to pass it.
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