Exam Professional Cloud Architect All Questions

View all questions & answers for the Professional Cloud Architect exam

Exam Professional Cloud Architect topic 1 question 52 discussion

Actual exam question from Google's Professional Cloud Architect

Question #: 52
Topic #: 1

[All Professional Cloud Architect Questions]

You have an application that will run on Compute Engine. You need to design an architecture that takes into account a disaster recovery plan that requires your application to fail over to another region in case of a regional outage. What should you do?

A. Deploy the application on two Compute Engine instances in the same project but in a different region. Use the first instance to serve traffic, and use the HTTP load balancing service to fail over to the standby instance in case of a disaster.
B. Deploy the application on a Compute Engine instance. Use the instance to serve traffic, and use the HTTP load balancing service to fail over to an instance on your premises in case of a disaster.
C. Deploy the application on two Compute Engine instance groups, each in the same project but in a different region. Use the first instance group to serve traffic, and use the HTTP load balancing service to fail over to the standby instance group in case of a disaster.
D. Deploy the application on two Compute Engine instance groups, each in a separate project and a different region. Use the first instance group to serve traffic, and use the HTTP load balancing service to fail over to the standby instance group in case of a disaster.

Show Suggested Answer

Suggested Answer: C 🗳️

by Eroc at Oct. 26, 2019, 3:40 p.m.

Comments

Submit Cancel

Eroc

Highly Voted 5 years, 1 month ago

Groups are better for management that non-groups so A and B are eliminated. Keeping the the instances in the same project will help maintain consistency, so C is better than D.

upvoted 39 times

nitinz

3 years, 9 months ago

C, because external LB needs **IG** period. It can either be managed or un-managed. You can not do External HTTP LB on instances. Also External HHTP LB is a Regional resource.

upvoted 15 times

...

LaxmanTiwari

1 year, 6 months ago

make sense.

upvoted 1 times

...

gigibit

Highly Voted 3 years, 3 months ago

Yes, but why not choose a cost-effective solution like A, preferring a not required performance optimization solution like C? The question it's just asking for a simple fail over

upvoted 13 times

Terryhsieh

11 months, 4 weeks ago

Use two groups, each group contain one instance would be more flixible than answer A.

upvoted 2 times

...

hellosam

1 year, 4 months ago

LB does not work without MIG

upvoted 4 times

...

todos213

2 years, 8 months ago

In real word situation, I'd choose A for a customer. The question doesn't mention performance to be enhanced or scalability.

upvoted 6 times

...

yilexar

Most Recent 1 year, 2 months ago

Now you can use regional load balancer to route traffic to instance groups in different GCP projects. Welcome to cloud :-) https://cloud.google.com/blog/products/networking/cloud-load-balancing-gets-cross-project-service-referencing

upvoted 6 times

...

heretolearnazure

1 year, 3 months ago

C is correct

upvoted 1 times

...

BeCalm

1 year, 9 months ago

To set up a load balancer with a Compute Engine backend, your VMs need to be in an instance group. The managed instance group provides VMs running the backend servers of an external HTTP load balancer Therefore C

upvoted 6 times

LaxmanTiwari

1 year, 6 months ago

good catch .

upvoted 2 times

...

BeCalm

1 year, 9 months ago

Why can't this be A since there is no mention of scaling?

upvoted 1 times

hellosam

1 year, 4 months ago

LB does not work without MIG

upvoted 1 times

axle818

1 year ago

You can use either MIG or unmanaged.. https://cloud.google.com/compute/docs/instance-groups/creating-groups-of-unmanaged-instances

upvoted 2 times

...

n_nana

1 year, 11 months ago

Selected Answer: C

Google recommend using MIG for Zonal outage and multiple MIG for regional outage https://cloud.google.com/architecture/disaster-recovery#compute-engine sentence says: Compute Engine instances are zonal resources, so in the event of a zone outage instances are unavailable by default. Compute Engine does offer managed instance groups (MIGs) which can automatically scale up additional VMs from pre-configured instance templates, both within a single zone and across multiple zones within a region. MIGs are ideal for applications that require resilience to zone loss and are stateless, but require configuration and resource planning. Multiple regional MIGs can be used to achieve region outage resilience for stateless applications.

upvoted 8 times

...

roaming_panda

1 year, 11 months ago

Selected Answer: C

MIG , in 1 project

upvoted 1 times

...

sameer2803

1 year, 11 months ago

the only solution that they want is to address regional outage. scalability or performance is not a concern at this point. MIG is better but that not what is solving the regional outage.

upvoted 1 times

n_nana

1 year, 11 months ago

According to this link, MIG is not only for performance and scalability. It is also for reliability https://cloud.google.com/architecture/disaster-recovery#compute-engine sentence says: Compute Engine instances are zonal resources, so in the event of a zone outage instances are unavailable by default. Compute Engine does offer managed instance groups (MIGs) which can automatically scale up additional VMs from pre-configured instance templates, both within a single zone and across multiple zones within a region. MIGs are ideal for applications that require resilience to zone loss and are stateless, but require configuration and resource planning. Multiple regional MIGs can be used to achieve region outage resilience for stateless applications.

upvoted 1 times

...

omermahgoub

1 year, 12 months ago

The correct answer is D: Deploy the application on two Compute Engine instance groups, each in a separate project and a different region. Use the first instance group to serve traffic, and use the HTTP load balancing service to fail over to the standby instance group in case of a disaster. To implement a disaster recovery plan that requires your application to fail over to another region in case of a regional outage, you should deploy the application on two Compute Engine instance groups, each in a separate project and a different region. This will ensure that the application is running in at least two regions, so that if one region experiences an outage, the application can still be accessed from the other region. You can use the HTTP load balancing service to distribute traffic between the two instance groups and to fail over to the standby instance group in case of a disaster. This will ensure that your application is always available, even in the event of a regional outage.

upvoted 2 times

omermahgoub

1 year, 12 months ago

Option A: Deploying the application on two Compute Engine instances in the same project but in a different region will not provide enough redundancy, as the instances are still in the same project and could be affected by the same regional outage. Option B: Deploying the application on a Compute Engine instance and using the HTTP load balancing service to fail over to an instance on your premises in case of a disaster is not a valid option, as it does not provide the required disaster recovery capability. Option C: Deploying the application on two Compute Engine instance groups, each in the same project but in a different region, is not a valid option, as it does not provide the required disaster recovery capability.

upvoted 2 times

...

oms_muc

2 years ago

IMHO A would also work (test env). In production relying on instances from other regions (introducing latency) just for possible expected zonal outages, would not be my best practice.

upvoted 1 times

...

AniketD

2 years, 1 month ago

Selected Answer: C

Correct answer is C. No need to host MIG in separate projects.

upvoted 2 times

...

megumin

2 years, 1 month ago

Selected Answer: C

ok for C

upvoted 1 times

...

AzureDP900

2 years, 2 months ago

C is right choice

upvoted 1 times

...

minmin2020

2 years, 2 months ago

Selected Answer: C

C - using instance groups when planning for DR is better than having single vm's (https://cloud.google.com/architecture/disaster-recovery). Having the resources in the same project is probably good for resource management.

upvoted 1 times

...

arjunvijayvargiya

2 years, 2 months ago

Answer should have been A as autoscaling requirements are not mentioned.

upvoted 1 times

...

BiddlyBdoyng

2 years, 2 months ago

I think you need an group for the load balancer so A no good?

upvoted 2 times

...

Load full discussion...