Discuss Google Professional Cloud Network Engineer Exam Topic 8 Question 88

You are designing a Partner Interconnect hybrid cloud connectivity solution with geo-redundancy across two metropolitan areas. You want to follow Google-recommended practices to set up the following region/metro pairs:

(region 1/metro 1)

(region 2/metro 2)

What should you do?

ACreate a Cloud Router in region 1 with two VLAN attachments connected to metro1-zone1-x.
Create a Cloud Router in region 2 with two VLAN attachments connected to metro1-zone2-x.

BCreate a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone1-x.
Create a Cloud Router in region 2 with two VLAN attachments connected to metro2-zone2-x.

CCreate a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone2-x.
Create a Cloud Router in region 2 with one VLAN attachment connected to metro2-zone2-x.

DCreate a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone1-x and one VLAN attachment connected to metro1-zone2-x.
Create a Cloud Router in region 2 with one VLAN attachment connected to metro2-zone1-x and one VLAN attachment to metro2-zone2-x.

Suggested Answer: D

The correct answer is D because it meets the following requirements:

It matches the hub-and-spoke model of the on-premises network, where each spoke is a separate VPC network that is connected to a central hub VPC network.

It minimizes management overhead and cost, because VPC Network Peering is a simple and low-cost way to connect VPC networks without using any external IP addresses or VPN gateways1.

It uses default networking quotas and limits, because VPC Network Peering does not consume any quota or limit for VPN tunnels, external IP addresses, or forwarding rules2.

It prevents connectivity between the spokes, because VPC Network Peering is non-transitive by default, meaning that a spoke can only communicate with the hub, not with other spokes1.To enforce this restriction, a third-party network appliance can be used as a default gateway in each spoke VPC network, which can filter out any traffic destined for other spokes3.

Option A is incorrect because it does not minimize cost, as Cloud VPN charges for egress traffic and requires external IP addresses for the VPN gateways4.Option B is incorrect because it does not prevent connectivity between the spokes, as VPC Network Peering allows direct communication between peered VPC networks by default1. Option C is incorrect because it does not minimize cost or use default quotas and limits, for the same reasons as option A.

VPC Network Peering overview | VPC

Quotas and limits | VPC

Hub-and-spoke network architecture | Cloud Architecture Center

Cloud VPN overview | Google Cloud

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34 comments · newest first

Derrick 11 months ago

I disagree with D, too many attachments could complicate things.

Mariann 11 months ago

Definitely going with D, it covers all bases!

Aleisha 11 months ago

Wait, why would you only use one VLAN attachment in region 1? Sounds risky!

Devora 11 months ago

I think B could work too, but not sure about the single VLAN in region 1.

Onita 12 months ago

Option D seems like the best choice for redundancy.

Mona 12 months ago

I feel like option A might be too limited since it only has two VLANs in total. We should probably aim for more redundancy across both regions.

Annalee 1 year ago

I'm a bit confused about the metro zones. Did we cover if we should connect to both zones in each region or just one?

Avery 1 year ago

I think option D sounds familiar from our practice questions. It seems to align with the geo-redundancy requirements we studied.

Fletcher 1 year ago

I remember we discussed the importance of having multiple VLAN attachments for redundancy, but I'm not sure if it's necessary to have two in each region.

Evette 1 year ago

This is a tricky one, but I think I can figure it out. I'll need to review the Google recommendations and make sure I'm following their best practices. Let me re-read the question and options carefully.

Lynette 1 year ago

Okay, I think I've got this. The key is to create a Cloud Router in each region with VLAN attachments to the corresponding metro zones for redundancy. I'll go with option D since it seems to best match the instructions.

Janine 1 year ago

Hmm, I'm a bit confused by the different metro zones and how they relate to the regions. I'll need to make sure I understand the topology and requirements before selecting an answer.

Vicente 1 year ago

This seems like a straightforward question about setting up a hybrid cloud connectivity solution with geo-redundancy. I'll need to carefully read through the options and think about the Google-recommended practices mentioned.

Louvenia 1 year ago

Okay, let's see. I think the Response Action element is used to control where the user navigates after the Integration Procedure is completed. That sounds like option C to me.

Joesph 1 year ago

Option D all the way! Gotta love that geo-redundancy. It's like having a backup for your backup - just in case your backup fails.

Sylvia 1 year ago

Hmm, this question is making my head spin. Maybe I should've taken that 'Cloud Router for Dummies' course before attempting this exam.

Merilyn 1 year ago

↳ replying to Sylvia

D) Create a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone1-x and one VLAN attachment connected to metro1-zone2-x. Create a Cloud Router in region 2 with one VLAN attachment connected to metro2-zone1-x and one VLAN attachment to metro2-zone2-x.

Dominga 1 year ago

↳ replying to Sylvia

C) Create a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone2-x. Create a Cloud Router in region 2 with one VLAN attachment connected to metro2-zone2-x.

Corinne 1 year ago

↳ replying to Sylvia

B) Create a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone1-x. Create a Cloud Router in region 2 with two VLAN attachments connected to metro2-zone2-x.

Alaine 1 year ago

↳ replying to Sylvia

A) Create a Cloud Router in region 1 with two VLAN attachments connected to metro1-zone1-x. Create a Cloud Router in region 2 with two VLAN attachments connected to metro1-zone2-x.

Julianna 1 year ago

Option B seems a bit strange to me. Why would we connect the Cloud Router in region 2 to a different metro area than region 1? That doesn't seem very 'geo-redundant' to me.

Rolande 1 year ago

↳ replying to Julianna

Fletcher 1 year ago

↳ replying to Julianna

B) Option B seems a bit strange to me. Why would we connect the Cloud Router in region 2 to a different metro area than region 1? That doesn't seem very 'geo-redundant' to me.

Ming 1 year ago

↳ replying to Julianna

A) Create a Cloud Router in region 1 with two VLAN attachments connected to metro1-zone1-x. Create a Cloud Router in region 2 with two VLAN attachments connected to metro1-zone2-x.

Kaycee 1 year ago

I'm not sure why we need to create two Cloud Routers. Wouldn't one Cloud Router with multiple VLAN attachments in each region be sufficient?

Hildred 1 year ago

↳ replying to Kaycee

C) Create a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone2-x. Create a Cloud Router in region 2 with one VLAN attachment connected to metro2-zone2-x.

Gwenn 1 year ago

↳ replying to Kaycee

B) Create a Cloud Router in region 1 with one VLAN attachment connected to metro1-zone1-x. Create a Cloud Router in region 2 with two VLAN attachments connected to metro2-zone2-x.

Louis 1 year ago

↳ replying to Kaycee

A) Create a Cloud Router in region 1 with two VLAN attachments connected to metro1-zone1-x. Create a Cloud Router in region 2 with two VLAN attachments connected to metro1-zone2-x.

Lashandra 2 years ago

Option D looks like the best choice to me. Creating a Cloud Router in each region with VLAN attachments to multiple zones in the metro areas ensures geo-redundancy and follows the Google-recommended practices.

Sueann 1 year ago

↳ replying to Lashandra

I agree, Option D provides the necessary redundancy across the two metropolitan areas. It's important to follow the recommended practices for a reliable Partner Interconnect hybrid cloud connectivity solution.

Diane 1 year ago

↳ replying to Lashandra

Hana 2 years ago

I'm leaning towards B, it seems like the most logical choice to me.

Laurel 2 years ago

I disagree, I believe the correct answer is D.

Jerry 2 years ago

I think the answer is A.

Google Professional Cloud Network Engineer Exam - Topic 8 Question 88 Discussion