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Exam AWS Certified Solutions Architect - Professional topic 1 question 33 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 33
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A read only news reporting site with a combined web and application tier and a database tier that receives large and unpredictable traffic demands must be able to respond to these traffic fluctuations automatically.
What AWS services should be used meet these requirements?

  • A. Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaimg group monitored with CloudWatch and RDS with read replicas.
  • B. Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch and RDS with read replicas.
  • C. Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch and multi-AZ RDS.
  • D. Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaling group monitored with CloudWatch and multi-AZ RDS.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by ppshein at March 13, 2021, 10:11 a.m.
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amministrazione
10 months, 2 weeks ago
A. Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaimg group monitored with CloudWatch and RDS with read replicas.
upvoted 1 times
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Takshashila
1 year, 9 months ago
For a read-only news reporting site that needs to handle unpredictable traffic demands, the architecture should be designed for high availability and scalability. Let's evaluate the options: A. Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaling group monitored with CloudWatch and RDS with read replicas. Stateless instances are ideal for scalability since they don't maintain any session information. If one instance fails, users can be directed to another instance without any disruption. ElastiCache Memcached can be used to cache frequent database queries or session data, reducing the load on the database. Autoscaling ensures that the application can scale out or in based on demand. CloudWatch monitors the performance and can trigger scaling actions. RDS with read replicas can handle a large number of read requests by distributing the load across multiple replicas.
upvoted 2 times
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EricZhang
2 years, 6 months ago
Why we would need ElastiCache to sync web/app tier up if they are stateless?
upvoted 1 times
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TigerInTheCloud
2 years, 6 months ago
Selected Answer: A
"read-only" -> read replicas "unpredictable traffic " -> autoscaling -> stateless
upvoted 1 times
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hilft
2 years, 11 months ago
A. read only. read replica.
upvoted 1 times
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aandc
2 years, 12 months ago
Selected Answer: A
high availability is not the requirement
upvoted 1 times
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tartarus23
3 years, 2 months ago
Selected Answer: A
A. RDS with read replicas offer better performance so handle unexpected traffic not multi-AZ RDS which only focuses on high availability.
upvoted 4 times
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Ni_yot
3 years, 4 months ago
A for me. Chose A because it also has memcache as well as read replicas. Both will defo speed up throughput and allow it to meet unexpected traffic demands.
upvoted 2 times
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HellGate
3 years, 4 months ago
My answer is A. The only difference between A and D is “RDS with read replicas” and “multi-AZ RDS”. Question only focus on high traffic, no HA requirement for multi-AZ.
upvoted 3 times
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lyxasd
3 years, 7 months ago
why not B?what's the difference between A and B?
upvoted 1 times
AkaAka4
3 years, 6 months ago
The difference here is that A is stateless and B is stateful. Here I quote: "A stateless application is one that needs no knowledge of previous interactions and stores no session information." (Refer to https://docs.aws.amazon.com/whitepapers/latest/best-practices-wordpress/stateless-web-tier.html) As the web app is read-only, it is stateless. Hence A. p.s. Reading AWS documentation does help. As you can see, others are always taking it as reference for their answers : )
upvoted 4 times
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FERIN_01
3 years, 8 months ago
D. already cache there to handle reads, which will forward to only primary RDS. Multi AZ makes more sense
upvoted 1 times
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Akhil254
3 years, 8 months ago
A Correct
upvoted 3 times
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backfringe
3 years, 8 months ago
go with A
upvoted 3 times
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01037
3 years, 8 months ago
Multi AZ is just backup, doesn't help improve throughput. So A
upvoted 3 times
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cldy
3 years, 9 months ago
A. Stateless + AutoScaling + CloudWatch + Read-Replicas
upvoted 4 times
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ppshein
3 years, 9 months ago
my answer is D.
upvoted 1 times
nitinz
3 years, 9 months ago
its A. you need read replica to speed up.... d is for H/A
upvoted 9 times
ppshein
3 years, 9 months ago
Yap, it's correct. Answer should be A
upvoted 3 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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