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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 Hide Answer
Suggested Answer: D 🗳️
by BillyC at Feb. 12, 2020, 8:10 p.m.
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virtual
Highly Voted 3 years, 7 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
5 months, 3 weeks ago
Agree, this is the differentiating point from C. D is correct.
upvoted 1 times
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student22
Most Recent 5 months, 4 weeks ago
Selected Answer: D
D. High availability == Multi-AZ RDS (not read replicas - C)
upvoted 1 times
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amministrazione
8 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, 7 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
5 months, 3 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.
upvoted 1 times
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rtguru
1 year, 11 months ago
I think b is the correct answer
upvoted 1 times
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Bill_Wiiliam
2 years, 10 months ago
Selected Answer: D
D is the right answer
upvoted 1 times
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vbal
3 years, 4 months ago
high availability = Multi-AZ ; D
upvoted 1 times
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cldy
3 years, 4 months 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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acloudguru
3 years, 5 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, 5 months ago
D Correct
upvoted 1 times
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01037
3 years, 6 months ago
How is availability calculated?
upvoted 1 times
01037
3 years, 6 months ago
I'll chiose D though
upvoted 1 times
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01037
3 years, 6 months ago
D for sure
upvoted 1 times
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cldy
3 years, 6 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, 6 months ago
D is correct
upvoted 1 times
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noisonnoiton
3 years, 6 months ago
go with D
upvoted 1 times
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AWSChia
3 years, 6 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, 6 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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