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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 Hide Answer
Suggested Answer: A 🗳️
by aswani at Sept. 5, 2022, 9:38 p.m.

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minmin2020
Highly Voted 1 year, 9 months 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 7 times
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Brainstorm
Most Recent 3 months, 3 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
3 months, 3 weeks ago
Sorry, I meant C is correct.
upvoted 1 times
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devnul
9 months, 3 weeks 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
3 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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BiddlyBdoyng
1 year, 1 month ago
A: looks an exact match for the requirements, 99.99% availability B: Is a manual implementation of HA, not optimizing cost C: Is behoynd HA, no longer optimizing cost. D: Does not provide close to 100% as possible
upvoted 3 times
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AugustoKras011111
1 year, 5 months ago
Selected Answer: A
Use HA (High Availability) VPN as required in the question. A is better aswer.
upvoted 3 times
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ale_brd_111
1 year, 7 months ago
Selected Answer: A
both A and C are possible solutions but A is cheaper.
upvoted 2 times
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megumin
1 year, 8 months ago
Selected Answer: A
A is ok
upvoted 2 times
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winter0w
1 year, 8 months 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
Gino17m
3 months, 2 weeks ago
You cannot migrate.....but...."You are deploying an application to Google Cloud"....nothing to migrate....
upvoted 1 times
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Mahmoud_E
1 year, 9 months ago
Selected Answer: A
A satisfty both requriements
upvoted 3 times
Mahmoud_E
1 year, 9 months ago
Satisfy both requirements for close to 100% availability and cost containment
upvoted 1 times
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AzureDP900
1 year, 10 months ago
A is right
upvoted 1 times
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ForkMeSoftly
1 year, 11 months ago
Selected Answer: A
best explained in https://jayendrapatil.com/tag/classic-vpn-vs-ha-vpn/ HA VPN provides an SLA of 99.99% service availability, when configured with two interfaces and two external IP addresses.
upvoted 2 times
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alvinlxw
1 year, 11 months ago
Selected Answer: A
To meet the 99.99% SLA on the Google Cloud side, there must be a tunnel from each of the two interfaces on the HA VPN gateway to the corresponding interfaces on the peer gateway.
upvoted 1 times
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alexandercamachop
1 year, 11 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 4 times
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zellck
1 year, 11 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 3 times
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Nirca
1 year, 11 months ago
Selected Answer: C
C is full mash. real HR with redundancy on the on premises site
upvoted 1 times
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kuboraam
1 year, 11 months ago
Selected Answer: A
I choose A. Gives you 99.99% availability, and is certainly cheaper than B, C and is more reliable than D. https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies
upvoted 3 times
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aswani
1 year, 11 months ago
Selected Answer: C
https://cloud.google.com/static/network-connectivity/docs/vpn/images/ha-vpn-gcp-to-on-prem-2-a.svg
upvoted 3 times
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A (35%)
C (25%)
B (20%)
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