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Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 171 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C02
Question #: 171
Topic #: 1
[All AWS Certified Solutions Architect - Associate SAA-C02 Questions]

A company is planning to build a new web application on AWS. The company expects predictable traffic most of the year and very high traffic on occasion. The web application needs to be highly available and fault tolerant with minimal latency.
What should a solutions architect recommend to meet these requirements?

  • A. Use an Amazon Route 53 routing policy to distribute requests to two AWS Regions, each with one Amazon EC2 instance.
  • B. Use Amazon EC2 instances in an Auto Scaling group with an Application Load Balancer across multiple Availability Zones.
  • C. Use Amazon EC2 instances in a cluster placement group with an Application Load Balancer across multiple Availability Zones.
  • D. Use Amazon EC2 instances in a cluster placement group and include the cluster placement group within a new Auto Scaling group.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by AjNapa at Aug. 9, 2020, 5:09 p.m.
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dfedeli
Highly Voted 3 years, 9 months ago
B. Use Amazon EC2 instances in an Auto Scaling group with an Application Load Balancer across multiple Availability Zones.
upvoted 67 times
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emiligl
Highly Voted 3 years, 9 months ago
It's B because Cluster doesnt't support Multi AZ
upvoted 44 times
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Uzbekistan
Most Recent 1 year, 3 months ago
Amazon EC2 instances cluster placement groups do not support multiple Availability Zones. They are designed to place instances in a single Availability Zone to ensure low-latency, high-bandwidth networking between instances. Only regular EC2 can be part of multiple Availability Zones.
upvoted 1 times
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Action
3 years ago
Selected Answer: B
Auto Scaling has to be included in the answer due to more traffic expected occassionally.
upvoted 4 times
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Sharan_25_v
3 years, 6 months ago
Selected Answer: B
Concept of Elimination
upvoted 3 times
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ABC1503
3 years, 8 months ago
A- incorrect as HA cannot be achieved by deploying in two regions. B - correct as multiple AZ - HA and Auto scaling - high traffic and expected traffic C - incorrect as cluster doesn't support multiple AZs D - incorrect as this won't resolve issue of HA.
upvoted 15 times
samuel1999
3 years, 7 months ago
good explain!!!!!!!!!
upvoted 1 times
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woke
3 years, 8 months ago
B. Use Amazon EC2 instances in an Auto Scaling group with an Application Load Balancer across multiple Availability Zones.
upvoted 5 times
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syu31svc
3 years, 8 months ago
"highly available and fault tolerant" -> Multi AZ comes into mind so A and D are wrong https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html: "Cluster – packs instances close together inside an Availability Zone" Answer is B
upvoted 6 times
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KK_uniq
3 years, 8 months ago
B for sure. Ec2 + ASG + ALB
upvoted 3 times
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Yogi
3 years, 8 months ago
Ans=B Ignore C, b/c cluster groups don't span in mulitpleAZ.
upvoted 3 times
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Berlinersp
3 years, 8 months ago
C or B are not correct as "Placement Groups work with a more static group of instances. No scaling exists, and they are not able to create or terminate instances. They only exist to control how EC2 instances are provisioned within an availability zone". A: Makes no sense here, so B is the correct one https://acloud.guru/forums/aws-certified-solutions-architect-associate/discussion/-LiZHdOa5nttWygqTScR/Difference%20between%20Placement%20group%20and%20Autoscaling%20group
upvoted 2 times
samuel1999
3 years, 7 months ago
you are kidding ?
upvoted 1 times
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RidzV
3 years, 7 months ago
I guess you mean C & D are not correct??
upvoted 1 times
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piyush28
3 years, 8 months ago
Clustering will not help here - it helps with inter-instance communications. Typically you use Auto Scaling + ALB + Multi AZ for HA and FT
upvoted 2 times
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rob
3 years, 8 months ago
I would say A - 1) HA - Multi AZ 2) It talks about the web app & minimal latency - use the latency policy in Route53
upvoted 1 times
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myutran
3 years, 8 months ago
Answer: B
upvoted 1 times
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awsdec2020
3 years, 8 months ago
Agree, Autoscaling is must so it's B
upvoted 1 times
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arunchu
3 years, 8 months ago
B I think
upvoted 1 times
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vbal
3 years, 8 months ago
Question: Is it possible to configure an ASG with PlacementGroup selected as Cluster and distribute instances to Multiple Availability Zones?
upvoted 1 times
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