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Exam AWS Certified Solutions Architect - Professional topic 1 question 44 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional

Question #: 44
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

Your company runs a customer facing event registration site This site is built with a 3-tier architecture with web and application tier servers and a MySQL database The application requires 6 web tier servers and 6 application tier servers for normal operation, but can run on a minimum of 65% server capacity and a single MySQL database.
When deploying this application in a region with three availability zones (AZs) which architecture provides high availability?

A. A web tier deployed across 2 AZs with 3 EC2 (Elastic Compute Cloud) instances in each AZ inside an Auto Scaling Group behind an ELB (elastic load balancer), and an application tier deployed across 2 AZs with 3 EC2 instances in each AZ inside an Auto Scaling Group behind an ELB and one RDS (Relational Database Service) instance deployed with read replicas in the other AZ.
B. A web tier deployed across 3 AZs with 2 EC2 (Elastic Compute Cloud) instances in each AZ inside an Auto Scaling Group behind an ELB (elastic load balancer) and an application tier deployed across 3 AZs with 2 EC2 instances in each AZ inside an Auto Scaling Group behind an ELB and one RDS (Relational Database Service) Instance deployed with read replicas in the two other AZs.
C. A web tier deployed across 2 AZs with 3 EC2 (Elastic Compute Cloud) instances in each AZ inside an Auto Scaling Group behind an ELB (elastic load balancer) and an application tier deployed across 2 AZs with 3 EC2 instances m each AZ inside an Auto Scaling Group behind an ELS and a Multi-AZ RDS (Relational Database Service) deployment.
D. A web tier deployed across 3 AZs with 2 EC2 (Elastic Compute Cloud) instances in each AZ Inside an Auto Scaling Group behind an ELB (elastic load balancer). And an application tier deployed across 3 AZs with 2 EC2 instances in each AZ inside an Auto Scaling Group behind an ELB and a Multi-AZ RDS (Relational Database services) deployment.

Show Suggested Answer

Suggested Answer: D 🗳️

by BillyC at Feb. 12, 2020, 8:10 p.m.

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Comments

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virtual

Highly Voted 3 years, 9 months ago

Yes, I think we can consider what remains if we loose one AZ, that is you retrieve your 65% capacity, so D seems correct

upvoted 12 times

mnsait

7 months, 2 weeks ago

Agree, this is the differentiating point from C. D is correct.

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student22

Most Recent 7 months, 3 weeks ago

Selected Answer: D

D. High availability == Multi-AZ RDS (not read replicas - C)

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amministrazione

10 months, 2 weeks ago

D. A web tier deployed across 3 AZs with 2 EC2 (Elastic Compute Cloud) instances in each AZ Inside an Auto Scaling Group behind an ELB (elastic load balancer). And an application tier deployed across 3 AZs with 2 EC2 instances in each AZ inside an Auto Scaling Group behind an ELB and a Multi-AZ RDS (Relational Database services) deployment.

upvoted 1 times

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rockyogi12345

1 year, 9 months ago

Option C is the correct answer, it has covered high availibility and Multi-AZ RDS. I am not sure why most of the people mentioned D as correct answer, a good architect will always thing for the solution which very cost effective as well as less complex and solve the purpose. Option A, Option B, and Option D do provide some level of redundancy and load balancing, but they don't spread both the web and application tiers across AZs. Option B and Option D spread the web tier across all three AZs, which might not be necessary for this architecture and could increase costs without a significant increase in availability. Option A lacks Multi-AZ RDS for the database, which is crucial for database availability in the event of a failure.

upvoted 1 times

mnsait

7 months, 2 weeks ago

Note that 65% of minimum capacity is required. So with 2 AZ, you lose 50% of the capacity in case one AZ goes down. Therefore, answer is D.

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rtguru

2 years, 1 month ago

I think b is the correct answer

upvoted 1 times

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Bill_Wiiliam

2 years, 11 months ago

Selected Answer: D

D is the right answer

upvoted 1 times

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vbal

3 years, 6 months ago

high availability = Multi-AZ ; D

upvoted 1 times

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cldy

3 years, 6 months ago

upvoted 1 times

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acloudguru

3 years, 7 months ago

Selected Answer: D

to operate at 65%, have 3 AZs with 2 instances each + RDS with Multi-AZ.

upvoted 2 times

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Akhil254

3 years, 7 months ago

D Correct

upvoted 1 times

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01037

3 years, 7 months ago

How is availability calculated?

upvoted 1 times

01037

3 years, 7 months ago

I'll chiose D though

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01037

3 years, 8 months ago

D for sure

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cldy

3 years, 8 months ago

D. to operate at 65%, have 3 AZs with 2 instances each + RDS with Multi-AZ.

upvoted 1 times

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srknbngl

3 years, 8 months ago

D is correct

upvoted 1 times

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noisonnoiton

3 years, 8 months ago

go with D

upvoted 1 times

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AWSChia

3 years, 8 months ago

You can follow this link https://aws.amazon.com/rds/features/multi-az/ and scroll down to this section "Multi-AZ deployments, multi-region deployments, and read replicas" to confirm the main purpose for each of them. So, D is a right choice.

upvoted 1 times

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AWSChia

3 years, 8 months ago

D is correct. Since you must have "...a minimum of 65% server capacity and a single database"

upvoted 1 times

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