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Exam AWS Certified Solutions Architect - Professional topic 1 question 690 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 690
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A European online newspaper service hosts its public-facing WordPress site in a collocated data center in London. The current WordPress infrastructure consists of a load balancer, two web servers, and one MySQL database server. A solutions architect is tasked with designing a solution with the following requirements:
✑ Improve the website's performance
✑ Make the web tier scalable and stateless
✑ Improve the database server performance for read-heavy loads
✑ Reduce latency for users across Europe and the US
✑ Design the new architecture with a goal of 99.9% availability
Which solution meets these requirements while optimizing operational efficiency?

  • A. Use an Application Load Balancer (ALB) in front of an Auto Scaling group of WordPress Amazon EC2 instances in one AWS Region and three Availability Zones. Configure an Amazon ElastiCache cluster in front of a Multi-AZ Amazon Aurora MySQL DB cluster. Move the WordPress shared files to Amazon EFS. Configure Amazon CloudFront with the ALB as the origin, and select a price class that includes the US and Europe.
  • B. Use an Application Load Balancer (ALB) in front of an Auto Scaling group of WordPress Amazon EC2 instances in two AWS Regions and two Availability Zones in each Region. Configure an Amazon ElastiCache cluster in front of a global Amazon Aurora MySQL database. Move the WordPress shared files to Amazon EFS. Configure Amazon CloudFront with the ALB as the origin, and select a price class that includes the US and Europe. Configure EFS cross- Region replication.
  • C. Use an Application Load Balancer (ALB) in front of an Auto Scaling group of WordPress Amazon EC2 instances in one AWS Region and three Availability Zones. Configure an Amazon DocumentDB table in front of a Multi-AZ Amazon Aurora MySQL DB cluster. Move the WordPress shared files to Amazon EFS. Configure Amazon CloudFront with the ALB as the origin, and select a price class that includes all global locations.
  • D. Use an Application Load Balancer (ALB) in front of an Auto Scaling group of WordPress Amazon EC2 instances in two AWS Regions and three Availability Zones in each Region. Configure an Amazon ElastiCache cluster in front of a global Amazon Aurora MySQL database. Move the WordPress shared files to Amazon FSx with cross-Region synchronization. Configure Amazon CloudFront with the ALB as the origin and a price class that includes the US and Europe.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by nitinz at March 18, 2021, 4:18 a.m.
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certainly
Highly Voted 3 years, 8 months ago
Correct choice is A. B and D are eliminated since Auto Scaling spans across multiple Availability Zones within the same region but cannot span across regions. C doesn't make sense by DocumentDB infront of another database.
upvoted 32 times
nitinz
3 years, 8 months ago
thanks for the comment, you are right. All LB are regional resources. you need route 53 to do it at global level.
upvoted 3 times
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Jesuisleon
Most Recent 2 years ago
Selected Answer: A
A is correct. B and D are out beacuse ALB can't across regions, justlimit to one region. C is out due to ElastiCache is suitable for read-heavy loads and users across Europe and the US so not need to select a price class that includes all global locations
upvoted 1 times
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andras
2 years, 3 months ago
Selected Answer: B
ou need to sync the DB between regions: global Amazon Aurora MySQL database "B" says ALB in each regions ->B
upvoted 1 times
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SureNot
2 years, 6 months ago
Selected Answer: A
At first sight it looks like an active-active cluster with all requirements - D fits well. But then you read it two more times and realize there is a mistake. Blame on question maker! =)
upvoted 1 times
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astalavista1
2 years, 9 months ago
Selected Answer: A
BD - Wrong as you can't configure ALB across regions but across AZ, need R53 first for multi-region config before moving to ALB. C - Wrong once it starts mentioning DocumentDB. A- Correct as it's a single Region with ALB across Multi-AZ, Cache in front of DB and Multi-AZ DB. Which satisfies all the requirements.
upvoted 2 times
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hilft
2 years, 10 months ago
A for me For B, regarding EFS cross region replication feature. As of 2022 Jan, AWS support EFS cross-region replication https://aws.amazon.com/blogs/aws/new-replication-for-amazon-elastic-file-system-efs/
upvoted 2 times
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Ni_yot
3 years, 3 months ago
A for me
upvoted 1 times
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cldy
3 years, 6 months ago
A. Use an Application Load Balancer (ALB) in front of an Auto Scaling group of WordPress Amazon EC2 instances in one AWS Region and three Availability Zones. Configure an Amazon ElastiCache cluster in front of a Multi-AZ Amazon Aurora MySQL DB cluster. Move the WordPress shared files to Amazon EFS. Configure Amazon CloudFront with the ALB as the origin, and select a price class that includes the US and Europe.
upvoted 1 times
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AzureDP900
3 years, 6 months ago
A is right
upvoted 1 times
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tgv
3 years, 7 months ago
AAA ---
upvoted 1 times
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WhyIronMan
3 years, 7 months ago
I'll go with A
upvoted 2 times
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hk436
3 years, 7 months ago
A is my answer.!
upvoted 1 times
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mustpassla
3 years, 7 months ago
A, B is not operational efficiency.
upvoted 1 times
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LCC92
3 years, 8 months ago
B is wrong "Configure EFS cross- Region replication." is not possible, can only use Datasync to replicate EFS.
upvoted 2 times
SkyZeroZx
1 year, 11 months ago
https://aws.amazon.com/es/blogs/aws/new-replication-for-amazon-elastic-file-system-efs/#:~:text=Configuring%20Replication,(Regional%20or%20One%20Zone).
upvoted 1 times
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Waiweng
3 years, 8 months ago
it's A
upvoted 3 times
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Ziegler
3 years, 8 months ago
A is the right option
upvoted 1 times
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SD13
3 years, 8 months ago
D for me
upvoted 2 times
SD13
3 years, 8 months ago
Changing it to A
upvoted 1 times
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