Refer to the exhibit. All routers in the network are configured correctly, and the expected routes are being exchanged among the routers. Which set of routes are learned from neighbors and installed on router 2?
A.
10.129.9.0/23 10.139.2.0/30 10.2.191.0/30 10.129.9.0/25
B.
10.129.9.0/23 10.40.1.0/30 10.2.191.0/30 10.129.9.0/25
C.
10.40.1.0/30 10.139.2.0/30 10.2.191.0/30 10.129.9.0/25
D.
10.129.9.0/23 10.139.2.0/30 10.129.9.0/25 10.22.1.0/24
Directly connected networks for R2:
10.22.1.0/24: This is the network directly connected to R2.
10.40.1.0/30: This is the network between R2 and its WAN connection.
Routes learned via neighbors:
10.139.2.0/30: This is the network between R71 and the WAN. It will be learned via the WAN.
10.2.191.0/30: This is the network between R40 and the WAN. It will be learned via the WAN.
10.129.9.0/23: This is the network behind R71. It will be learned via R71.
10.129.9.0/25: This is the network behind R40. It will be learned via R40.
remember that the route with the lowest administrative distance will be put into the routing table.
even though 10.129.9.0 and 10.40.1.0 are being shared in the ospf process, router 2 has already learned them as directly connected routes with a AD of 0. so when the router 2 receives an LSA with this information it disregards adding those networks through ospf (AD of 110) and keeps the directly connected routes (key is they are not learned from neighbors)
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