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Exam AWS Certified Solutions Architect - Professional topic 1 question 629 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 629
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A company is running a two-tier web-based application in an on-premises data center. The application user consists of a single server running a stateful application. The application connects to a PostgreSQL database running on a separate server. The application's user base is expected to grow significantly, so the company is migrating the application and database to AWS. The solution will use Amazon Aurora PostgreSQL, Amazon EC2 Auto Scaling, and Elastic Load
Balancing.
Which solution will provide a consistent user experience that will allow the application and database tiers to scale?

  • A. Enable Aurora Auto Scaling for Aurora Replicas. Use a Network Load Balancer with the least outstanding requests routing algorithm and sticky sessions enabled.
  • B. Enable Aurora Auto Scaling for Aurora writes. Use an Application Load Balancer with the round robin routing algorithm and sticky sessions enabled.
  • C. Enable Aurora Auto Scaling for Aurora Replicas. Use an Application Load Balancer with the robin routing and sticky sessions enabled.
  • D. Enable Aurora Scaling for Aurora writers. Use a Network Load Balancer with the least outstanding requests routing algorithm and sticky sessions enabled.
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Suggested Answer: B 🗳️
by liono at Nov. 4, 2020, 6:45 p.m.
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beso
Highly Voted 3 years, 7 months ago
C, Aurora Auto Scaling enables your Aurora DB cluster to handle sudden increases in connectivity or workload. When the connectivity or workload decreases, Aurora Auto Scaling removes unnecessary Aurora Replicas so that you don't pay for unused provisioned DB instances
upvoted 23 times
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Sin_Dan
Most Recent 6 months, 1 week ago
You cannot horizontally scale the aurora writers! There can be only one Aurora Writer instance per cluster. The only way it can be scaled is vertically. Technically, Aurora writers cannot be scaled automatically and hence the correct answer shall be C.
upvoted 1 times
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evargasbrz
2 years, 3 months ago
Selected Answer: C
I'll go with C
upvoted 1 times
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MarkChoi
2 years, 8 months ago
Selected Answer: C
It's C
upvoted 1 times
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cldy
3 years, 4 months ago
C. Enable Aurora Auto Scaling for Aurora Replicas. Use an Application Load Balancer with the robin routing and sickly sessions enabled.
upvoted 2 times
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AzureDP900
3 years, 4 months ago
C is right !
upvoted 1 times
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andylogan
3 years, 5 months ago
It's C with Aurora Replicas
upvoted 2 times
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nsei
3 years, 5 months ago
C is correct
upvoted 1 times
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student22
3 years, 5 months ago
C Auto Scaling for Aurora Replicas + ALB with sticky sessions
upvoted 3 times
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tgv
3 years, 5 months ago
CCC ---
upvoted 1 times
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WhyIronMan
3 years, 5 months ago
I'll go with C
upvoted 1 times
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Kopa
3 years, 6 months ago
C also for me
upvoted 1 times
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Waiweng
3 years, 6 months ago
it's C
upvoted 4 times
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alisyech
3 years, 6 months ago
i choose C
upvoted 2 times
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rcher
3 years, 6 months ago
ALB cause its Web application (Although i can argue that NLB can scale better,just that you need to do SSL termination at the web app) Aurora scale read replica, haven't heard of writes (Correct me if i am wrong) C then
upvoted 4 times
kirrim
3 years, 5 months ago
The Least Outstanding Requests algo is only supported on the ALB, not the NLB that I could find. So it's definitely C in my mind
upvoted 4 times
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Ebi
3 years, 6 months ago
C is the correct answer.
upvoted 4 times
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Bulti
3 years, 6 months ago
Answer is C
upvoted 1 times
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