Exam AWS-SysOps topic 1 question 24 discussion

Exam question from Amazon's AWS-SysOps

Question #: 24
Topic #: 1

You have a web-style application with a stateless but CPU and memory-intensive web tier running on a cc2 8xlarge EC2 instance inside of a VPC The instance when under load is having problems returning requests within the SLA as defined by your business The application maintains its state in a DynamoDB table, but the data tier is properly provisioned and responses are consistently fast.
How can you best resolve the issue of the application responses not meeting your SLA?

A. Add another cc2 8xlarge application instance, and put both behind an Elastic Load Balancer
B. Move the cc2 8xlarge to the same Availability Zone as the DynamoDB table
C. Cache the database responses in ElastiCache for more rapid access
D. Move the database from DynamoDB to RDS MySQL in scale-out read-replica configuration

Show Suggested Answer

Suggested Answer: A 🗳️
DynamoDB is automatically available across three facilities in an AWS Region. So moving in to a same AZ is not possible / necessary.
In this case the DB layer is not the issue, the EC2 8xlarge is the issue; so add another one with a ELB in-front of it.
Reference:
https://aws.amazon.com/dynamodb/faqs/

by newbie2019 at Oct. 27, 2019, 7:45 p.m.

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karmaah

Highly Voted 1 year, 7 months ago

Very Bad Question. Unable to understand properly. Use filtering method like DB is good, So ignore C& D. B is not required. Only option is A.

upvoted 6 times

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kteng

Highly Voted 1 year, 7 months ago

two hints : - data tier is properly provisioned and responses are consistently fast. - CPU and memory-intensive web tier so, ignore the option for database, and ignore the elasticache which is for mem benefit, the answer is A.

upvoted 5 times