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Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 452 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C02
Question #: 452
Topic #: 1
[All AWS Certified Solutions Architect - Associate SAA-C02 Questions]

A solutions architect is designing the architecture for a new web application. The application will run on AWS Fargate containers with an Application Load
Balancer (ALB) and an Amazon Aurora PostgreSQL database. The web application will perform primarily read queries against the database.
What should the solutions architect do to ensure that the website can scale with increasing traffic? (Choose two.)

  • A. Enable auto scaling on the ALB to scale the load balancer horizontally.
  • B. Configure Aurora Auto Scaling to adjust the number of Aurora Replicas in the Aurora cluster dynamically.
  • C. Enable cross-zone load balancing on the ALB to distribute the load evenly across containers in all Availability Zones.
  • D. Configure an Amazon Elastic Container Service (Amazon ECS) cluster in each Availability Zone to distribute the load across multiple Availability Zones.
  • E. Configure Amazon Elastic Container Service (Amazon ECS) Service Auto Scaling with a target tracking scaling policy that is based on CPU utilization.
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Suggested Answer: BE 🗳️
by sic6sic at May 31, 2021, 9:44 p.m.
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Balki
Highly Voted 3 years, 6 months ago
Answer is B E. Problem is to enable autoscaling in DB and application side. B helps in making the DB to auto scale. ECS has cluster and service. We usually have service based auto scaling. Below link has more details on ECS auto scaling https://aws.amazon.com/blogs/compute/automatic-scaling-with-amazon-ecs/
upvoted 16 times
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andriikor
Highly Voted 3 years, 6 months ago
BE my choice
upvoted 6 times
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pxcat11
Most Recent 2 years, 4 months ago
Selected Answer: BE
My take B - Use read replicas in Aurora cluster to deal with additional reads. E - ECS will add or remove tasks based on CPU utilization. It's kind of assumed. the service defines ALB target groups and as tasks are added or removed, ECS will add/remove them from the target groups. You need to scale both the db up for reads and the infrastructure which will perform this reads. A - ALB auto scales for most workloads. So no. C/D - These seem complementary. Given the choice between C/D and B/E, B/E gives more scale but less availability. We want scalability.
upvoted 1 times
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archimate
2 years, 8 months ago
other site says its AB
upvoted 2 times
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archimate
2 years, 8 months ago
can anyone explain why ACD wrong?
upvoted 1 times
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reve666
2 years, 11 months ago
Selected Answer: BE
Answer is B E.
upvoted 1 times
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Alfio
3 years, 6 months ago
Sorry guys, but i don't get why nobody cares about the singol load balancer in this design. In this situation we have in order from outside ALB-> Fargate->Aurora Postgres. They asking for website scalable against incrising traffic. So why don't consider the auto scaling for ALB?
upvoted 2 times
Alcpt
3 years, 4 months ago
this is auto managed by Fargate. Focus on the elements outside of Fargate. B & E.
upvoted 1 times
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Vantirup
2 years, 8 months ago
Also ALB will scale automatically based on the requests it receive.
upvoted 1 times
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jealbave
3 years, 6 months ago
Why B, E, is it not supposed that if the web application is fargate I should not worry about scaling, why is it serverless? .. it wouldn't be BC. can someone please explain to me.
upvoted 3 times
Jonfernz
3 years, 5 months ago
Because with Fargate, you don't have to specify the scaling over multi-AZs. This process is automated when you define target tracking within Fargate. Once you do that, Fargate will do the autoscaling spread over multi-AZs for you.
upvoted 3 times
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TollaMS
3 years, 6 months ago
Confused please share a link
upvoted 4 times
OctaCore
3 years, 6 months ago
Below link for ECS Fargate autoscaling with target tracking or step scaling policies https://aws.amazon.com/premiumsupport/knowledge-center/ecs-fargate-service-auto-scaling/
upvoted 1 times
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Gats
3 years, 7 months ago
B and E
upvoted 2 times
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AnuhyaTech
3 years, 7 months ago
answer B,E
upvoted 4 times
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Steve21
3 years, 7 months ago
My ans B and E
upvoted 4 times
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sic6sic
3 years, 7 months ago
Yep, BE is my take. Aurora Auto Scaling for the DB ECS with auto-scaling Target tracking scaling policy for the Fargate
upvoted 6 times
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C (25%)
B (20%)
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