Exam AWS Certified Solutions Architect - Professional topic 1 question 468 discussion

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

Question #: 468
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

A company is moving a business-critical, multi-tier application to AWS. The architecture consists of a desktop client application and server infrastructure. The server infrastructure resides in an on-premises data center that frequently fails to maintain the application uptime SLA of 99.95%. A Solutions Architect must re- architect the application to ensure that it can meet or exceed the SLA.
The application contains a PostgreSQL database running on a single virtual machine. The business logic and presentation layers are load balanced between multiple virtual machines. Remote users complain about slow load times while using this latency-sensitive application.
Which of the following will meet the availability requirements with little change to the application while improving user experience and minimizing costs?

A. Migrate the database to a PostgreSQL database in Amazon EC2. Host the application and presentation layers in automatically scaled Amazon ECS containers behind an Application Load Balancer. Allocate an Amazon WorkSpaces WorkSpace for each end user to improve the user experience.
B. Migrate the database to an Amazon RDS Aurora PostgreSQL configuration. Host the application and presentation layers in an Auto Scaling configuration on Amazon EC2 instances behind an Application Load Balancer. Use Amazon AppStream 2.0 to improve the user experience.
C. Migrate the database to an Amazon RDS PostgreSQL Multi-AZ configuration. Host the application and presentation layers in automatically scaled AWS Fargate containers behind a Network Load Balancer. Use Amazon ElastiCache to improve the user experience.
D. Migrate the database to an Amazon Redshift cluster with at least two nodes. Combine and host the application and presentation layers in automatically scaled Amazon ECS containers behind an Application Load Balancer. Use Amazon CloudFront to improve the user experience.

Show Suggested Answer

Suggested Answer: B 🗳️

by Xiaoyao2000 at Sept. 16, 2019, 9:25 a.m.

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donathon

Highly Voted 3 years, 8 months ago

B A: Workspace is expensive and a single instance of EC2 hosting the DB would not improve the availability. B: B is the best answer. Aurora would improve availability that can replicate to multiple AZ (6 copies). Auto scaling would improve the performance together with a ALB. AppStream is like Citrix that deliver hosted Apps to users. C: Fargate is managed ECS. Elasticache only improve DB access performance but not the total user experience. This does not address the slowness that users faced. D: Redshift is dataware house and not a SQL based database.

upvoted 37 times

heany

2 years, 8 months ago

B is wrong. should be C. 1. B didn't mention Multi-AZ of aurora. Aurora is not Multi-AZ by default. Single AZ cannot achieve SLA required ( https://aws.amazon.com/rds/aurora/sla/ ) 2. Appstream is a good product but you need a lot of changes . you need to build the image of the app and deployed it appstream

upvoted 1 times

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Moon

Highly Voted 3 years, 8 months ago

Answer "B" meets the requirements. A: using containers, is a big change to app. Maintaining EC2 is a challenge and could affect SLA. B: using RDS, is auto maintenance with high SLA. using autoscaling on EC2 allow more availability/performance. Appstream is good virtual solution. C: lots of re-works. D: there is no DB, only Datawarehouse.

upvoted 15 times

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hollie

Most Recent 2 years, 5 months ago

Selected Answer: B

AppStream can "lets your users start using your application immediately"(https://aws.amazon.com/appstream2/faqs/?nc=sn&loc=7), meeting the requirements of improving slow loading

upvoted 2 times

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AjayPrajapati

2 years, 7 months ago

Selected Answer: B

B improves SLA from all layers. Desktop app can be supported by App stream C - elastic cache needs code changes. Does not talk about desktop app

upvoted 3 times

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Vinafec

2 years, 7 months ago

Selected Answer: C

Going with C; B does not meet uptime SLA: https://aws.amazon.com/appstream2/sla/

upvoted 3 times

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Dionenonly

2 years, 8 months ago

Selected Answer: B

Don't confuse Desktop Client Application to "Desktop". Desktop = Workspace Desktop Client Application = Appstream

upvoted 2 times

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Blair77

2 years, 8 months ago

Selected Answer: C

-"A Solutions Architect must re- architect the application to ensure that it can meet or exceed the SLA." Fargate SLA: 99.99% RDS SLA: 99.95% Aurora SLA: 99.99 AppStream SLA: 99.9% AppStream does not meet the 99.95% SLA. I'll go with C.

upvoted 2 times