Exam AWS Certified Developer Associate topic 1 question 138 discussion

Exam question from Amazon's AWS Certified Developer Associate

Question #: 138
Topic #: 1

[All AWS Certified Developer Associate Questions]

A company has a two-tier application running on an Amazon EC2 server that handles all of its AWS based e-commerce activity. During peak times, the backend servers that process orders are overloaded with requests. This results in some orders failing to process. A developer needs to create a solution that will re-factor the application.
Which steps will allow for more flexibility during peak times, while still remaining cost-effective? (Choose two.)

A. Increase the backend T2 EC2 instance sizes to x1 to handle the largest possible load throughout the year.
B. Implement an Amazon SQS queue to decouple the front-end and backend servers.
C. Use an Amazon SNS queue to decouple the front-end and backend servers.
D. Migrate the backend servers to on-premises and pull from an Amazon SNS queue.
E. Modify the backend servers to pull from an Amazon SQS queue.

Show Suggested Answer

Suggested Answer: BE 🗳️

by faramawi at May 2, 2021, 9:43 p.m.

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Comments

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TroyMcLure

Highly Voted 3 years, 8 months ago

Correct Answer: "B" & "E"

upvoted 20 times

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faramawi

Highly Voted 3 years, 9 months ago

Answer: BE

upvoted 6 times

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SD_CS

Most Recent 1 year, 5 months ago

Selected Answer: BE

B and E make most sense here.

upvoted 1 times

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AswinDe

1 year, 11 months ago

cost effective is A :) lol .. it is B & E

upvoted 1 times

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rcaliandro

2 years ago

Selected Answer: BE

We can use both SNS and SQS to decuple the FE from BE. If we use the SNS the answer D says "Migrate the backend servers to on-premises and pull from an Amazon SNS queue" and this doesnàt make any sense since there is no need to migrate from Cloud to AWS (usually the companies migrate from on prem to cloud solutions). So, opting for SQS, the answers B and E are the correct ones: use SQS to decouple the FE from the BE and let's modify the BEs to pull from the queue

upvoted 1 times

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pancman

2 years, 4 months ago

Selected Answer: BE

B and E. For those who don't know what a two-tier application is: it is called two tier when front end is connected directly to the data source (like a database). So there is no EC2 or SQS queue in between the front end and the data source. Although this architecture is cost-effective because you only pay running the data source, but not something in between. But the disadvantage is, just like the question states, the back end cannot respond to all requests coming at the same time.

upvoted 6 times

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