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Exam 300-420 topic 1 question 169 discussion

Actual exam question from Cisco's 300-420

Question #: 169
Topic #: 1

Refer to the exhibit. A customer experienced an unexpected network outage when the link between R1 and R2 went down. An architect must design a solution to ensure network continuity in the event the link tails again. Which solution should the design include?

A. Make R3 an L1L2 router.
B. Make R31 an L1 router.
C. Make Area 0 L2-only.
D. Make R11 an L2 router.

Show Suggested Answer

Suggested Answer: A 🗳️

by Reinier_veen at Oct. 13, 2022, 1 p.m.

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mgiuseppe86

9 months, 4 weeks ago

How is Area0-R11 forming any adjacency with Area0-R1? It cant. L1 cannot form adjacency to L1/L2 from another area. Doing this in a lab, i get *Oct 7 01:00:02.864: ISIS-Adj: Area mismatch, level 1 IIH on GigabitEthernet0/0 *Oct 7 01:00:04.153: ISIS-Adj: Sending L1 LAN IIH on GigabitEthernet0/0, length 1497 *Oct 7 01:00:04.837: ISIS-Adj: Rec L2 IIH from 5254.001e.d934 (GigabitEthernet0/0), cir type L1L2, cir id 0000.0000.0011.01, length 1497, ht(30) *Oct 7 01:00:04.837: ISIS-Adj: is-type mismatch

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Marinheiro

1 year ago

Selected Answer: A

C It's wrong because area 1 would not comunicate with area 0

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314_pi

1 year, 2 months ago

Selected Answer: A

R11 is L1

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Dyks

1 year, 2 months ago

Selected Answer: A

You cannot connect an L1 router to a L2 router so converting the entire Area to L2 will cause an issue between R1 and R11. Converting R3 into an L1/L2 provides the right solution.

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dgonzalezexamtopics

1 year, 3 months ago

Ok, u r right, but then u would be choosing 2 answers. As it to be just one, I would go with A, because it would make R3 a L1L2 router and, consequently, it would have also a L2 domain

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jzzmth

1 year, 4 months ago

Selected Answer: C

This is a tricky question... because technically answers A and C will both work. I'm going with answer C because I'm assuming Area 0 here is a backbone area and as such best practice is to make all routers in the backbone area L2 only. Doing this prevents default routes from being propagated and creating sub-optimal routing.

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zzmejce

1 year, 7 months ago

Selected Answer: C

Area 0 should be L2, R11 should be L2...

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Reinier_veen

1 year, 9 months ago

Selected Answer: A

answer is correct. ENSLD 300-420 cert guide page 117. When creating a backbone there should never be L1 routers between (L2 only, or) L1/L2 routers.

upvoted 3 times

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