QID: AN110

[lodgeg]

(QID:AN110) Refer to the exhibit.  A router received five routes from different routing information sources.  Which two routes does the router install in its routing table? (Choose two)

Exhibit - How2Pass.com
-----------------------------
iBGP route 10.0.0.0/30
RIP route 10.0.0.0/30
OSPF route 10.0.0.0/16
OSPF route 10.0.0.0/30
EIGRP route 10.0.0.1/32

How2Pass Answers:
OSPF route 10.0.0.0/16
EIGRP route 10.0.0.1/32

Shouldn't the correct answers be EIGRP 10.0.0.1/32 and OSPF route 10.0.0.0/30 due to the longest prefix rule?

[lodgeg]

FYI got this question on the Exam....Would be nice to verify correct answer, anyone?

[jmolnar2210]

FYI got this question on the Exam....Would be nice to verify correct answer, anyone?

 Do you know if you got the answer right or wrong?

[lodgeg]

jmolnar,
I do not know if I got the question correct or not. Cisco does not tell you which questions you missed just percentage of areas tested.

I selected: OSPF route 10.0.0.0/16 and EIGRP route 10.0.0.1/32 which is H2P's correct answers.

Would like further explanation from H2P as to why they feel OSPF route 10.0.0.0/16 is a correct answer as opposed to OSPF route 10.0.0.0/30?

[triple777]

FYI got this question on the Exam....Would be nice to verify correct answer, anyone?

Did you pass the exam?

[nivaccounts]

(QID:AN110) Refer to the exhibit.  A router received five routes from different routing information sources.  Which two routes does the router install in its routing table? (Choose two)

Exhibit - How2Pass.com
-----------------------------
iBGP route 10.0.0.0/30
RIP route 10.0.0.0/30
OSPF route 10.0.0.0/16
OSPF route 10.0.0.0/30
EIGRP route 10.0.0.1/32

How2Pass Answers:
OSPF route 10.0.0.0/16
EIGRP route 10.0.0.1/32

Shouldn't the correct answers be EIGRP 10.0.0.1/32 and OSPF route 10.0.0.0/30 due to the longest prefix rule?

I believe that the answer How2Pass chose is predicated on having the /16 route and the /30 routes pointing to the same next hop destination.  If that were the case then the /16 route would efficiently summarize those four routes.  This is an ambiguity not addressed in the question, however if there are only 2 correct answers this would be the only case that makes sense.

If the /16 and /30 routes pointed to different next hop destinations, then the router would install three routes in its routing table, which would be OSPF route 10.0.0.0/16, EIGRP route 10.0.0.1/32, and one of the /30 routes depending on the next hop destination(s).  If you were to just compare the /30s without any other information present, OSPF has the lowest AD value.

The wording that the routes came from "different routing information sources" definitely makes this confusing and I was similarly frustrated.  Based on the information present in the question I would chose H2P's answer on the test, but if someone were to provide a more definitive answer I would be grateful.

[calgary]

I have the same question related to AN110, in that I would have selected the OSPF 10.0.0.0/30 over OSPF 10.0.0.0/16 due to a /30 having the longer matching prefix. I hope How2Pass can further clarify the question and the explanation for us ?