Refer to the exhibit. Area 10 is a regular OSPF area, and networks 10.1.1.0/24 and 172.16.1.0/24 are internal. Which design provides optimal routing between both networks when the link between routers C and E fails?
A.
Move the link between routers C and D to area 10.
B.
Create an OSPF virtual link between routers E and F.
C.
Create a tunnel between routers E and F in area 10.
Answer is A because links A<>B and C<>D are not OSPF neighbours at all so without implementing option A, there is no route if link C<>E fails because D has no route.
I guess I never considered the blobs of colours meaning anything. But now i should pay attention to that. I didnt realize C and D werent in an OSPF area because the yellow or blue blobs dont reflect that
Because of the SPF algorithm. OSPF calculates intra-area routes before inter-area routes. If the link between C and D was in area 0, C would calculate C-F-D-E as the shortest route, which isn't true. If the link between C and D is in area 10, C will calculate C-D-E as the shortest route.
I think it's because links A<>B and C<>D are not OSPF neighbours at all so without implementing option A, there is no route if link C<>E fails.
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