Exam AWS Certified Solutions Architect - Associate SAA-C03 All Questions

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Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 167 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C03

Question #: 167
Topic #: 1

[All AWS Certified Solutions Architect - Associate SAA-C03 Questions]

A company runs a production application on a fleet of Amazon EC2 instances. The application reads the data from an Amazon SQS queue and processes the messages in parallel. The message volume is unpredictable and often has intermittent traffic. This application should continually process messages without any downtime.

Which solution meets these requirements MOST cost-effectively?

A. Use Spot Instances exclusively to handle the maximum capacity required.
B. Use Reserved Instances exclusively to handle the maximum capacity required.
C. Use Reserved Instances for the baseline capacity and use Spot Instances to handle additional capacity.
D. Use Reserved Instances for the baseline capacity and use On-Demand Instances to handle additional capacity.

Show Suggested Answer

Suggested Answer: D 🗳️

by goatbernard at Nov. 15, 2022, 2:38 p.m.

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HayLLlHuK

Highly Voted 2 years, 5 months ago

Selected Answer: C

"without any downtime" - Reserved Instances for the baseline capacity "MOST cost-effectively" - Spot Instances to handle additional capacity

upvoted 46 times

LuckyAro

2 years, 5 months ago

Dude, read the question, cost consideration was not mentioned in the question.

upvoted 3 times

ShinobiGrappler

2 years, 4 months ago

Dude, read the question, "Which solution meets these requirements MOST cost-effectively?"

upvoted 46 times

kraken21

2 years, 2 months ago

I am leaning towards C because the idea of having a queue is to decouple the processing. If an instance goes down(spot) while processing will it not show up back after the visibility timeout? So using spot meets the cost-effective objective.

upvoted 5 times

Sutariya

1 year, 9 months ago

Intermediate data stored in SQS queue so once free then it take data and process.

upvoted 1 times

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MrSaint

2 years, 1 month ago

cost-effectively means, Cheapest solution (cost) that achieve all the requirements (effectively). Its not cost-effectively if is just cheapest solution that fail to address all the requirements, in this case. (This application should continually process messages without any downtime) no matter the volume, since it is unpredictable. B for example, address the requirement but not the cheapest solution that achieve it. D is the cheaper choice that address the requirement (without any downtime). and C is cheaper than D but do not garantee that you wont have downtime since it is SPOT instances.

upvoted 18 times

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kraken21

2 years, 2 months ago

How can you have baseline capacity when your message volume is unpredictable and often has intermittent traffic?

upvoted 4 times

MutiverseAgent

1 year, 11 months ago

For this reason I think correct answer is A

upvoted 1 times

Macadam

1 year, 7 months ago

Spot instances cannot be an option as it is unreliable and the question requires the messages to be continuously processed

upvoted 5 times

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taer

Highly Voted 2 years, 7 months ago

Selected Answer: D

D is the correct answer

upvoted 28 times

Drayen25

2 years, 4 months ago

C is correct, read for cost effectiveness

upvoted 6 times

diabloexodia

1 year, 11 months ago

AWS has stopped issuing spot instances so i think C

upvoted 1 times

diabloexodia

1 year, 11 months ago

so i think C is incorrect*. the Correct ans is D.

upvoted 2 times

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sezer

2 years, 2 months ago

if you cannot find enough spot instance you will have downtime you cannot always find spot instance

upvoted 13 times

Kumaran1508

2 years ago

Why downtime when there are baseline reserved instances?

upvoted 3 times

creamymangosauce

11 months, 1 week ago

When traffic spikes and there happens to an increase in the spot price, if the price exceeds the threshold set then there would be downtime as no additional compute can be acquired. Hence even if spot instances are more cost effective, I would interpret the cost effective requirement to be the ability to reliably acquire new instances and dispose of when not needed, hence on demand instances

upvoted 2 times

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network_enthusiast

Most Recent 2 months ago

Selected Answer: C

C is the correct answer

upvoted 1 times

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Yak_Yeti

2 months, 1 week ago

Selected Answer: C

"MOST cost-effectively" - Spot Instances to handle additional capacity The application will process the messages with the reserved instances - slowly - with no downtime.

upvoted 1 times

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chest_jd

2 months, 1 week ago

Selected Answer: C

Cost-effective - C.

upvoted 1 times

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Faraz999

2 months, 2 weeks ago

Selected Answer: C

I am leaning towards C because the idea of having a queue is to decouple the processing.

upvoted 1 times

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triptimandal01

2 months, 3 weeks ago

Selected Answer: C

Spot Instances can be used to handle additional capacity to accommodate intermittent traffic. Spot Instances are ideal for variable and unpredictable workloads because they allow you to take advantage of unused EC2 capacity at a significantly lower cost than On-Demand Instances.

upvoted 1 times

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tch

3 months, 1 week ago

Selected Answer: D

baseline capacity" refers to the normal or expected capacity performance of a system or process, so use reserved instance - this to fulfil without any downtime and cost-effective if "additional capacity" refers to resources or capabilities beyond the standard or baseline capacity needed to handle normal operations, allowing for flexibility and the ability to handle surges in demand or unexpected events - then we should use on-demand instances

upvoted 1 times

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iamroyalty_k

4 months, 1 week ago

Selected Answer: C

C is correct because it balances cost and reliability using a combination of: - Reserved Instances for steady-state traffic (ensuring continuous processing). - Spot Instances for handling spikes in traffic (reducing costs significantly). A - ❌ Not Reliable – Spot Instances can be interrupted at any time. Using them exclusively could cause processing delays or failures. B - ❌ Not Cost-Effective – RIs are best for predictable workloads, but over-provisioning for peak loads leads to unnecessary costs when traffic is low. D - ❌ More Expensive Than Spot Instances – On-Demand Instances are more costly than Spot Instances for handling additional capacity.

upvoted 1 times

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Dharmarajan

4 months, 1 week ago

Selected Answer: D

I believe the best fit for the scenario is D. D has a portion that is about 90% more expensive than C. However, Spot instances can be interrupted which means that some of the processes can be interrupted, which is not acceptable. So considering that I am choosing D.

upvoted 1 times

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Mrigraj12

4 months, 2 weeks ago

Selected Answer: C

Easily the most cost effective

upvoted 1 times

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mayorpasca32

4 months, 2 weeks ago

Selected Answer: C

Spot Instances – Can be scaled up dynamically when message volume increases, at a much lower cost than On-Demand instances.

upvoted 1 times

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skybrink

4 months, 3 weeks ago

Selected Answer: C

Why Option C is Correct: Reserved Instances: Provide a cost-effective solution for the baseline capacity (predictable, steady traffic) with a significant discount compared to On-Demand Instances. Spot Instances: Are highly cost-effective (up to 90% cheaper than On-Demand Instances) and can be used for handling additional, variable traffic since the application processes messages in parallel and can tolerate instance interruptions. Combining these instance types ensures a balance of cost savings and availability.

upvoted 1 times

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henrikamirbekyan

5 months, 2 weeks ago

Selected Answer: C

I think it is C The instance will remove the message from the queue when it is already processed, there is one downside here when the spot instance is terminated before message removal, it will lead to double processing. The question is not talking about time, so having baseline + spot is the most cost effective here.

upvoted 1 times

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