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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.
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Suggested Answer: D 🗳️
by goatbernard at Nov. 15, 2022, 2:38 p.m.
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HayLLlHuK
Highly Voted 1 year, 11 months ago
Selected Answer: C
"without any downtime" - Reserved Instances for the baseline capacity "MOST cost-effectively" - Spot Instances to handle additional capacity
upvoted 39 times
LuckyAro
1 year, 11 months ago
Dude, read the question, cost consideration was not mentioned in the question.
upvoted 3 times
ShinobiGrappler
1 year, 11 months ago
Dude, read the question, "Which solution meets these requirements MOST cost-effectively?"
upvoted 38 times
kraken21
1 year, 8 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, 3 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
1 year, 7 months 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 13 times
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kraken21
1 year, 8 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, 5 months ago
For this reason I think correct answer is A
upvoted 1 times
Macadam
1 year, 1 month 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, 1 month ago
Selected Answer: D
D is the correct answer
upvoted 27 times
Drayen25
1 year, 10 months ago
C is correct, read for cost effectiveness
upvoted 6 times
diabloexodia
1 year, 5 months ago
AWS has stopped issuing spot instances so i think C
upvoted 1 times
diabloexodia
1 year, 5 months ago
so i think C is incorrect*. the Correct ans is D.
upvoted 2 times
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sezer
1 year, 9 months ago
if you cannot find enough spot instance you will have downtime you cannot always find spot instance
upvoted 13 times
Kumaran1508
1 year, 7 months ago
Why downtime when there are baseline reserved instances?
upvoted 3 times
creamymangosauce
5 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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wellzz5422
Most Recent 2 weeks, 5 days ago
Selected Answer: D
D. Use Reserved Instances for the baseline capacity and use On-Demand Instances to handle additional capacity. Most Voted
upvoted 1 times
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tom_cruise
3 weeks, 1 day ago
Selected Answer: D
"without any downtime" rules out spot instance.
upvoted 1 times
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ddewit
3 weeks, 5 days ago
Selected Answer: C
Comparison with other options: A. Spot Instances exclusively: While cost-effective, Spot Instances can be interrupted and may not ensure uninterrupted message processing, which is critical for this application. B. Reserved Instances exclusively: Over-provisioning Reserved Instances to handle the maximum capacity would lead to unnecessary costs during low-traffic periods. D. Reserved Instances + On-Demand Instances: On-Demand Instances are more expensive than Spot Instances for handling additional capacity, making this less cost-effective.
upvoted 1 times
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PaulGa
1 month, 4 weeks ago
Selected Answer: D
Ans D - "Continual processing" rules out Spot; so its Reserved Instances for the baseline capacity and use On-Demand Instances for peak
upvoted 2 times
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Mish
1 month, 4 weeks ago
Selected Answer: C
without any downtime - Reserved Instances for the baseline capacity cost-effectively - Spot Instances to handle additional capacity
upvoted 1 times
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Mish
1 month, 4 weeks ago
C. Use Reserved Instances for the baseline capacity and use Spot Instances to handle additional capacity.
upvoted 1 times
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aturret
2 months, 2 weeks ago
Selected Answer: D
First we need to ensure that no downtime. Then we can talk about cost-effective.
upvoted 2 times
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XXXXXlNN
3 months, 1 week ago
without any downtime... this imediately exclude spot instances...
upvoted 2 times
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bignatov
3 months, 3 weeks ago
Selected Answer: D
I think it is D, because NOWHERE is mentioned that it should be the most cost effective scenario. It is mentioned that it must process messages without any downtime.
upvoted 2 times
MatAlves
3 months, 2 weeks ago
it LITERALLY says: "Which solution meets these requirements MOST cost-effectively?"
upvoted 2 times
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[Removed]
4 months, 2 weeks ago
Selected Answer: C
"without any downtime" - Reserved Instances for the baseline capacity "MOST cost-effectively" - Spot Instances to handle additional capacity
upvoted 1 times
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jaradat02
4 months, 4 weeks ago
C is definitely the most cost-effective, also the application shouldn't face any downtime because of the reserved instances always running.
upvoted 1 times
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jatric
5 months, 2 weeks ago
Selected Answer: D
Dude without downtime - spot instances might interrupt the processing if it goes away. So correct answer is D
upvoted 3 times
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ChymKuBoy
6 months ago
Selected Answer: C
C for sure
upvoted 1 times
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shil_31
6 months, 3 weeks ago
Selected Answer: C
Reserved Instances (RIs) provide a cost-effective way to cover the baseline capacity, ensuring a predictable number of instances are always available. Spot Instances can handle additional capacity during traffic spikes, providing scalability without committing to a specific number of instances. This combination (C) offers the most cost-effective solution, as RIs cover the baseline and Spot Instances handle variable demand. Why not D? On demand is expensive than Spot instances.
upvoted 1 times
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pipisyokunin
6 months, 3 weeks ago
Selected Answer: D
If it is a spot instance, it may become unusable. Since the question states that there is no downtime, I think D is more in line with the purpose.
upvoted 2 times
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A (35%)
C (25%)
B (20%)
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