Huawei Exam H31-161 Topic 6 Question 84 Discussion

Actual exam question for Huawei's H31-161 exam

Question #: 84
Topic #: 6

On a city's dual-plane bearer network, PE1-A and PE1-B are two PEs in different planes of the city.

Three CEs are on the same VPN. The OSPF is used to exchange VPN route information between CE

1 and PE1-A and between CE 2 and PE1-B. The default route leading to PE1-A is configured on CE

3, and a static route leading to CE 3 is configured on PE1-

AThe static route is imported to the OSPF,
and the OSPF route is imported to the VPN instance of the BGP. The MP-IBGP neighbor relationship
is established among the PEs. Subinterfaces are enabled in the links between PEs and are bound
to the same VPN to exchange VPN route information between PEs. How many routes on PE1-B can reach CE 3?

AOnly one (The route leading to CE 3 is learned based on the IBGP neighbor relationship between
PEs. The other route is filtered out by OSPF loopback detection.)

BTwo (One route is learned based on the IBGP neighbor relationship between PEs, and the other
one is the OSPF category-5 route.)

CNo route

DOnly the OSPF category-5 route can reach CE 3.

Show Suggested Answer

Suggested Answer: C

by Sheron at Apr 14, 2024, 10:55 PM

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Viola

6 months ago

But the static route leading to CE 3 is learned based on the IBGP neighbor relationship between PEs.

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Freeman

6 months ago

I disagree. I believe the answer is B, as there are two possible routes that can reach CE 3.

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Joana

6 months ago

I agree with because the static route is imported to the OSPF and then to the VPN instance of the BGP.

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Viola

6 months ago

I think the correct answer is A.

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Rebecka

7 months ago

But if the routes are imported to BGP and OSPF, wouldn't that allow more routes to reach CE 3?

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Nicolette

7 months ago

I'm leaning towards C, I don't think any route can reach CE 3

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Eloisa

7 months ago

I disagree, I believe the answer is A because of the way routes are imported and filtered

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Rebecka

8 months ago

I think the answer is B because there are two routes that can reach CE 3

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Frank

8 months ago

Haha, I bet the exam writers are trying to trip us up with this one. They probably want us to think about things like OSPF loopback detection and how that might impact the routing on PE1-B.

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Blair

8 months ago

Aha, I think I see where this is going. The static route on PE1-A is likely being imported into the OSPF domain, and then the OSPF route is being imported into the VPN instance of the BGP. That would give us two possible routes to CE3 on PE1-B.

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Arlette

7 months ago

I agree. One route from IBGP neighbor and the other from OSPF category-5 route.

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Daren

7 months ago

I think the answer is B) Two

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Alpha

8 months ago

Okay, let's break this down step-by-step. We have OSPF being used to exchange VPN route information between CE1 and PE1-A, and between CE2 and PE1-B. Then we have a static route configured on PE1-A leading to CE3.

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Wilda

9 months ago

Hmm, I think the key here is understanding how the OSPF and BGP routes are being imported and exchanged between the different components. That will likely determine the number of routes that PE1-B can reach CE 3 with.

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Lilli

9 months ago

Yeah, this is definitely not a straightforward question. We need to carefully consider the different routing mechanisms and how they interact in this scenario.

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Janine

9 months ago

This is a tricky question. It seems to involve some complex networking concepts like dual-plane bearer networks, OSPF, BGP, and VPN routing. I'm not sure I fully understand all the details, but I'll give it my best shot.

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