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Exam Professional Cloud Network Engineer topic 1 question 152 discussion

Actual exam question from Google's Professional Cloud Network Engineer

Question #: 152
Topic #: 1

[All Professional Cloud Network Engineer Questions]

Your company has a Virtual Private Cloud (VPC) with two Dedicated Interconnect connections in two different regions: us-west1 and us-east1. Each Dedicated Interconnect connection is attached to a Cloud Router in its respective region by a VLAN attachment. You need to configure a high availability failover path. By default, all ingress traffic from the on-premises environment should flow to the VPC using the us-west1 connection. If us-west1 is unavailable, you want traffic to be rerouted to us-east1. How should you configure the multi-exit discriminator (MED) values to enable this failover path?

A. Use regional routing. Set the us-east1 Cloud Router to a base priority of 100, and set the us-west1 Cloud Router to a base priority of 1
B. Use global routing. Set the us-east1 Cloud Router to a base priority of 100, and set the us-west1 Cloud Router to a base priority of 1
C. Use regional routing. Set the us-east1 Cloud Router to a base priority of 1000, and set the us-west1 Cloud Router to a base priority of 1
D. Use global routing. Set the us-east1 Cloud Router to a base priority of 1000, and set the us-west1 Cloud Router to a base priority of 1

Show Suggested Answer

Suggested Answer: D 🗳️

by AzureDP900 at Dec. 1, 2022, 1:30 a.m.

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mshry

Highly Voted 2 years ago

Selected Answer: D

I think it should be D. Base priorities are whole numbers from 0 to 65535. Base priority for BGP sessions among CRs should be between 0-200 from region to region traffic. Only option D gives the safest priority gap, for our intended routing. https://cloud.google.com/network-connectivity/docs/router/concepts/overview#advertised-prefixes-and-priorities

upvoted 7 times

flyhighman

1 year, 12 months ago

I think it needs to be lower than 201 to use the failover path normally. So I think it's B.

upvoted 1 times

flyhighman

1 year, 12 months ago

I was wrong. The answer is D.

upvoted 3 times

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desertlotus1211

Most Recent 9 months, 3 weeks ago

Quite frankly none of these are the correct answers. You really don't have to do anything besides enable global routing. the Base Priority can both be 100, BUT the region to region cost is what matters.

upvoted 2 times

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Thornadoo

1 year, 3 months ago

Selected Answer: D

Answer is D. To adjust priorities between routes in a single region, use values less than 201. This guarantees that region-to-region costs don't impact route priorities. A route from another region (a remote region) can't have a priority lower than 201. If you use higher values, region-to-region costs might impact your route priorities. https://cloud.google.com/network-connectivity/docs/router/how-to/updating-priority

upvoted 2 times

desertlotus1211

9 months, 3 weeks ago

how is D the correct answer?

upvoted 1 times

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didek1986

1 year, 4 months ago

Selected Answer: D

upvoted 1 times

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rglearn

1 year, 4 months ago

Selected Answer: D

Base priority cost between two cloud region is between 0-200 hence in our case failover route is from on-prem to other failover region(us-east1) hence value should be greater than 200. Global routing with us-east1 with more than 200 priority should be our answer i.e Option D

upvoted 3 times

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desertlotus1211

1 year, 6 months ago

https://cloud.google.com/network-connectivity/docs/router/concepts/overview#med-values

upvoted 1 times

desertlotus1211

1 year, 6 months ago

Answer D

upvoted 1 times

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mitithakur

1 year, 6 months ago

Base priorities for BGP sessions among Cloud Routers in a region should be between 0 and 200

upvoted 1 times

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mondigo

1 year, 9 months ago

B is ok Base priorities for BGP sessions among Cloud Routers in a region should be between 0 and 200, inclusive

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pk349

1 year, 11 months ago

• B. Use global routing. Set the us-east1 Cloud Router to a base priority of 100 *****, and set the us-west1 Cloud Router to a base priority of 1

upvoted 1 times

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gagan5

1 year, 11 months ago

Selected Answer: D

D ic correct

upvoted 4 times

conip

1 year, 10 months ago

Inter-region cost is min 200 - so us-west will adv EAST's pref with priority at least 1+200 Us-east router must adv its own prefix higher than that so 1000

upvoted 2 times

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hxhwing

1 year, 11 months ago

Selected Answer: D

For B: Normally, traffic from on-premise to us-east1 will not go through us-west1 so D is correct.

upvoted 1 times

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AzureDP900

2 years ago

B. Use global routing. Set the us-east1 Cloud Router to a base priority of 100, and set the us-west1 Cloud Router to a base priority of 1

upvoted 1 times

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pfilourenco

2 years ago

Selected Answer: B

B is correct here.

upvoted 3 times

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nosense

2 years ago

Selected Answer: B

In this case have MEG and different regions. Can't to use regional routes. A and C left default route priority 100. B is right

upvoted 1 times

nosense

2 years ago

I was mistake D is correct because, A route from another region (a remote region) can't have a priority lower than 201. If you use higher values, region-to-region costs might impact your route priorities. so. in this situation we should choose D. source: https://cloud.google.com/network-connectivity/docs/router/how-to/updating-priority correct me, if i'm wrong

upvoted 4 times

mity99

1 year, 9 months ago

With global dynamic routing, Cloud Router can advertise routes from regions other than its own. When it does, it adds a region-to-region cost that can range from 201 to 9,999, affecting how routes are prioritized. To account for these region-to-region costs, use the following guidelines when setting base advertised route priorities: To adjust priorities between routes in a single region, use values less than 201. This guarantees that region-to-region costs don't impact route priorities. A route from another region (a remote region) can't have a priority lower than 201. If you use higher values, region-to-region costs might impact your route priorities. Has to be D. Can't use 100 for remote regions as that is < 201.

upvoted 1 times

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flyhighman

1 year, 12 months ago

I think it needs to be lower than 201 to use the failover path normally. So I think it's B.

upvoted 1 times

nosense

1 year, 12 months ago

This link provide examples. https://cloud.google.com/network-connectivity/docs/router/concepts/overview#10.0.2.024-europe-west1 U can check the first example, route from 1 region to another. as you can see, no one provide priority 0 - 100, in MED. and one more note A route from another region (a remote region) can't have a priority lower than 201.

upvoted 3 times

flyhighman

1 year, 12 months ago

Thanks for the explanation, you're right. The answer is D.

upvoted 2 times

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ccieman2016

2 years ago

Selected Answer: B

Is possible only with B and D, but priority in D answer is wrong, cann't be 1000. B is correct here.

upvoted 4 times

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playpacman

2 years ago

I vote for B as global routing is needed to see all networks

upvoted 2 times

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AzureDP900

2 years ago

MED works based on priority ..Please see this link for more details .. (MED) values to enable this failover path A is right answer

upvoted 1 times

AzureDP900

2 years ago

https://cloud.google.com/network-connectivity/docs/router/concepts/overview#s_with_activeactive_tunnels

upvoted 1 times

AzureDP900

2 years ago

changing to B after reading documentation.

upvoted 1 times

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AzureDP900

2 years ago

Base priorities are whole numbers from 0 to 65535. The highest possible base priority is 0. The default base priority is 100. If you don't specify a base priority, the default priority is used.

upvoted 1 times

ccieman2016

2 years ago

It is wrong, global routing is required here. please, read your link again.

upvoted 1 times

AzureDP900

2 years ago

Sure, I will read

upvoted 1 times

AzureDP900

2 years ago

B. Use global routing. Set the us-east1 Cloud Router to a base priority of 100, and set the us-west1 Cloud Router to a base priority of 1

upvoted 1 times

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