Exam Professional Cloud Architect topic 1 question 191 discussion

Actual exam question from Google's Professional Cloud Architect

Question #: 191
Topic #: 1

[All Professional Cloud Architect Questions]

You are deploying an application to Google Cloud. The application is part of a system. The application in Google Cloud must communicate over a private network with applications in a non-Google Cloud environment. The expected average throughput is 200 kbps. The business requires:
✑ as close to 100% system availability as possible
✑ cost optimization
You need to design the connectivity between the locations to meet the business requirements. What should you provision?

A. An HA Cloud VPN gateway connected with two tunnels to an on-premises VPN gateway
B. Two Classic Cloud VPN gateways connected to two on-premises VPN gateways Configure each Classic Cloud VPN gateway to have two tunnels, each connected to different on-premises VPN gateways
C. Two HA Cloud VPN gateways connected to two on-premises VPN gateways Configure each HA Cloud VPN gateway to have two tunnels, each connected to different on-premises VPN gateways
D. A single Cloud VPN gateway connected to an on-premises VPN gateway

Show Suggested Answer

Suggested Answer: A 🗳️

by aswani at Sept. 5, 2022, 9:38 p.m.

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minmin2020

Highly Voted 2 years, 1 month ago

Selected Answer: A

A is true only if the on-prem (peer) gateway has two separate external P addresses. The HA VPN gateway uses two tunnels, one tunnel to each external IP address on the peer device as described in https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies#configurations_that_support_9999_availability C is a complete solution that provides full redundancy of the on-prem gateway. This is probably more expensive and having two HA VPN Gateways is an unusual configuration as the online documentation only describes using one HA VPN Gateway A appears to be correct with assumptions...!

upvoted 8 times

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alexandercamachop

Highly Voted 2 years, 3 months ago

Selected Answer: A

A can provide 99.99% availability as well, and no need for C which will be more expensive. https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies#1-peer-1-address

upvoted 5 times

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Brainstorm

Most Recent 7 months, 4 weeks ago

Selected Answer: D

D is correct. A. Single HA Cloud VPN with Two Tunnels: This offers redundancy, but a single point of failure exists at the Cloud VPN gateway itself. A second HA Cloud VPN gateway provides additional fault tolerance. B. Two Classic Cloud VPNs with Multiple Tunnels: Classic Cloud VPNs are being phased out and might be less cost-effective than HA Cloud VPNs. Additionally, managing multiple Classic Cloud VPN gateways can be more complex. D. Single Cloud VPN Gateway: This offers a single point of failure and wouldn't achieve the desired level of high availability.

upvoted 1 times

Brainstorm

7 months, 4 weeks ago

Sorry, I meant C is correct.

upvoted 1 times

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devnul

1 year, 1 month ago

why not B? See https://cloud.google.com/network-connectivity/docs/vpn/concepts/classic-topologies#option-3 Don't you need redundant VPN gateways on the other side (on-prem) to reach close to 100% availability? A) has a single VPN gateway on-prem.

upvoted 1 times

Gino17m

7 months, 2 weeks ago

Because B i about increasing throughput and load balancing not about availability ??? Expected avarage throughput is "only" 200 kbps. A) has a single VPN...right but I think the clue is in "You are deploying an application to Google Cloud. The application is part of a system."....so probably you have no leverage on on-premises solutions ?????? ....but in fact I'm not sure wchich answer is right :(

upvoted 1 times

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2 years ago

Selected Answer: D

Correct Answer is D, You cannot migrate an existing Cloud VPN tunnel or tunnels on a Classic VPN gateway to an HA VPN gateway. Instead, you need to create new tunnels and delete the old ones. https://cloud.google.com/network-connectivity/docs/vpn/how-to/moving-to-ha-vpn#general_guidelines

upvoted 2 times