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Exam Professional Cloud Architect topic 6 question 7 discussion

Actual exam question from Google's Professional Cloud Architect

Question #: 7
Topic #: 6

[All Professional Cloud Architect Questions]

For this question, refer to the Mountkirk Games case study. You are in charge of the new Game Backend Platform architecture. The game communicates with the backend over a REST API.
You want to follow Google-recommended practices. How should you design the backend?

A. Create an instance template for the backend. For every region, deploy it on a multi-zone managed instance group. Use an L4 load balancer.
B. Create an instance template for the backend. For every region, deploy it on a single-zone managed instance group. Use an L4 load balancer.
C. Create an instance template for the backend. For every region, deploy it on a multi-zone managed instance group. Use an L7 load balancer.
D. Create an instance template for the backend. For every region, deploy it on a single-zone managed instance group. Use an L7 load balancer.

Show Suggested Answer

Suggested Answer: C 🗳️

by jcmoranp at Oct. 26, 2019, 11:46 a.m.

Comments

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jcmoranp

Highly Voted 5 years, 1 month ago

It's C. You need a L7 balancer and multi-zone

upvoted 66 times

nitinz

3 years, 9 months ago

It is C, you need L7 & mulit-region as its the ask.

upvoted 7 times

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tartar

4 years, 4 months ago

C is ok

upvoted 15 times

bjuneja

4 years ago

L4 load balancing offers traffic management of transactions at the network protocol layer (TCP/UDP). ... L7 load balancing works at the highest level of the OSI model. L7 bases its routing decisions on various characteristics of the HTTP/HTTPS header Mountrik requirment is global so C is ok

upvoted 14 times

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JJu

Highly Voted 5 years ago

I think answer is C. This game type is mobile. Check this link : https://cloud.google.com/solutions/gaming/cloud-game-infrastructure#dedicated_game_server I recommend this section : ‘Request/response based servers’ explain : In particular, however, mobile game servers, without a critical demand for real-time communication, have adopted HTTP request and response semantics like those used in web hosting. this game use HTTP load balancer. HTTP load balancer is L7.

upvoted 23 times

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kratosmat

Most Recent 1 year, 8 months ago

Selected Answer: A

we don't need multi-zonal if we have multi-region. the traffic is internal, we could need an L7 LB if there are specific requirements, but I don't see them.

upvoted 1 times

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surajkrishnamurthy

1 year, 12 months ago

Selected Answer: C

C gives best option Key word "REST API " "L7 balancer" , "Multi Zone"

upvoted 5 times

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megumin

2 years, 1 month ago

Selected Answer: C

C is ok

upvoted 1 times

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AzureDP900

2 years, 2 months ago

C perfectly make sense

upvoted 2 times

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muneebarshad

2 years, 3 months ago

Selected Answer: B

I think the answer is B and here is my reasoning. Users never communicate with the Backend server (due to security reasons) there is always a Frontend Service that is open to the internet and FE Service communicates with BE Server. The reason they called it Backend Serer is since it must have a Front end server refer to the solution reference (https://reviewnprep.com/blog/gcp-how-to-work-on-mountkirk-games-case-study/) the traffic flow should look like this...... User(mobile) -> FE Game Server (hosted in GCP) -> BE Server (hosted in GCP) Since BE Service is not exposed to the internet therefore we would require a regional L4 Balancer since regional Load Balancer is NOT internet facing and it's from VM to VM

upvoted 2 times

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jabrrJ68w02ond1

2 years, 3 months ago

Multi-zone makes it high available. L7 balances load for e.g. HTTP traffic. So the answer is C. Why not A? L4 works at the network protocol (TCP/UDP) which is not suitable for REST APIs.

upvoted 2 times

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DrishaS4

2 years, 4 months ago

Selected Answer: C

L7 LB for RestAPI.

upvoted 2 times

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Nirca

2 years, 4 months ago

Selected Answer: C

C it is

upvoted 1 times

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amxexam

2 years, 7 months ago

Selected Answer: C

C is correct

upvoted 1 times

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SAMBIT

2 years, 8 months ago

Out dated case study. Don’t waste time https://cloud.google.com/certification/guides/professional-cloud-architect https://services.google.com/fh/files/blogs/master_case_study_mountkirk_games.pdf

upvoted 2 times