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Exam Professional Cloud Network Engineer topic 1 question 90 discussion

Actual exam question from Google's Professional Cloud Network Engineer
Question #: 90
Topic #: 1
[All Professional Cloud Network Engineer Questions]

Your company has separate Virtual Private Cloud (VPC) networks in a single region for two departments: Sales and Finance. The Sales department's VPC network already has connectivity to on-premises locations using HA VPN, and you have confirmed that the subnet ranges do not overlap. You plan to peer both VPC networks to use the same HA tunnels for on-premises connectivity, while providing internet connectivity for the Google Cloud workloads through Cloud NAT. Internet access from the on-premises locations should not flow through Google Cloud. You need to propagate all routes between the Finance department and on-premises locations. What should you do?

  • A. Peer the two VPCs, and use the default configuration for the Cloud Routers.
  • B. Peer the two VPCs, and use Cloud Router’s custom route advertisements to announce the peered VPC network ranges to the on-premises locations.
  • C. Peer the two VPCs. Configure VPC Network Peering to export custom routes from Sales and import custom routes on Finance's VPC network. Use Cloud Router’s custom route advertisements to announce a default route to the on-premises locations.
  • D. Peer the two VPCs. Configure VPC Network Peering to export custom routes from Sales and import custom routes on Finance's VPC network. Use Cloud Router’s custom route advertisements to announce the peered VPC network ranges to the on-premises locations.
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Suggested Answer: D 🗳️
by ccieman2016 at Dec. 2, 2022, 12:48 a.m.

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ccieman2016
Highly Voted 11 months ago
Selected Answer: D
100% sure for D. https://cloud.google.com/vpc/docs/vpc-peering#benefits_of_exchanging_custom_routes
upvoted 7 times
AzureDP900
10 months, 3 weeks ago
Agreed. D. Peer the two VPCs. Configure VPC Network Peering to export custom routes from Sales and import custom routes on Finance's VPC network. Use Cloud Router’s custom route advertisements to announce the peered VPC network ranges to the on-premises locations.
upvoted 1 times
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1f01b87
Most Recent 1 month, 2 weeks ago
Selected Answer: D
D is the correct answer
upvoted 1 times
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Komal697
7 months ago
Selected Answer: D
Option D is the correct answer because it meets all of the requirements mentioned in the scenario. Peering the two VPCs provides connectivity between them without internet traffic flow, and configuring VPC Network Peering to export custom routes from Sales and import custom routes on Finance's VPC network allows for the propagation of all routes between the two VPCs. Finally, using Cloud Router’s custom route advertisements to announce the peered VPC network ranges to the on-premises locations allows for internet access through Cloud NAT while preventing on-premises traffic from flowing through Google Cloud.
upvoted 3 times
Komal697
7 months ago
Option A is incorrect because it does not address the requirement of propagating all routes between the Finance department and on-premises locations. Option B is incorrect because it only announces the peered VPC network ranges to the on-premises locations and does not address the requirement of propagating all routes between the Finance department and on-premises locations. Option C is incorrect because it only announces a default route to the on-premises locations and does not address the requirement of propagating all routes between the Finance department and on-premises locations.
upvoted 2 times
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juniormclaughlin
7 months, 2 weeks ago
Selected Answer: B
Why D? I suspect the correct answer is B. There is no need to explicitly configure exporting/importing of subnet routes between peered networks. "VPC peers always export subnet routes." "VPC peers always import subnet routes if the subnet uses private IP addresses." "You can't disable the subnet route exchange or select which subnet routes are exchanged."
upvoted 2 times
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pk349
9 months, 3 weeks ago
• D. Peer the two VPCs. Configure VPC Network Peering to export custom routes from Sales and import custom routes on Finance's VPC network. Use Cloud Router’s custom route advertisements to announce the peered VPC ***** network ranges to the on-premises locations.
upvoted 1 times
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pfilourenco
11 months ago
Selected Answer: D
100% sure for D.
upvoted 3 times
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al_zo
11 months ago
Agreed on D. https://cloud.google.com/vpc/docs/vpc-peering#benefits_of_exchanging_custom_routes "Cloud Router doesn't learn routes and propagate routes from peered VPC networks. As a result, you must have a custom route advertisement on the Cloud Router"
upvoted 2 times
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