Refer to the Exhibit.
Based on the SPF calculation in the exhibit, what is the shortest path to reach R3 from R1?
A.
R2-R3
B.
R2-R5-R4
C.
R3
D.
R2-R4
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correct ans is A
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C is the right answer as inta-area routes are preferred over inter-area routes. Metric does not count in this case.
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According to section 11 of RFC 2328 , the order of preference for OSPF routes is:
intra-area routes, O
interarea routes, O IA
external routes type 1, O E1
external routes type 2, O E2
C is the correct answer.
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for shure loopback of r3 is in area 0
so r1 receives 2 summary lsa’s from 2 abr’s (r2 & r3)
spf counting cost of abr reachibility only
thats why A is correct
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The answer is c because route from r2 -r3 is an intra-area. So the more preferred is to use the inter-area route first even though higher pref
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I think this question is misleading. the question asks the route based on spf calculation which would be r2-r3.
but from a route selection perspective. r1 would use the directly connected interface to r3 because it is directly connected.
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Correct Answer: C
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