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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 146 discussion

A company runs a stateless web application in production on a group of Amazon EC2 On-Demand Instances behind an Application Load Balancer. The application experiences heavy usage during an 8-hour period each business day. Application usage is moderate and steady overnight. Application usage is low during weekends.
The company wants to minimize its EC2 costs without affecting the availability of the application.
Which solution will meet these requirements?

  • A. Use Spot Instances for the entire workload.
  • B. Use Reserved Instances for the baseline level of usage. Use Spot instances for any additional capacity that the application needs.
  • C. Use On-Demand Instances for the baseline level of usage. Use Spot Instances for any additional capacity that the application needs.
  • D. Use Dedicated Instances for the baseline level of usage. Use On-Demand Instances for any additional capacity that the application needs.
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Suggested Answer: B 🗳️

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rob74
Highly Voted 2 years, 4 months ago
Selected Answer: B
In the Question is mentioned that it has o Demand instances...so I think is more cheapest reserved and spot
upvoted 26 times
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Qjb8m9h
Highly Voted 2 years, 3 months ago
Answer is B: Reserved is cheaper than on demand the company has. And it's meet the availabilty (HA) requirement as to spot instance that can be disrupted at any time. PRICING BELOW. On-Demand: 0% There’s no commitment from you. You pay the most with this option. Reserved : 40%-60%1-year or 3-year commitment from you. You save money from that commitment. Spot 50%-90% Ridiculously inexpensive because there’s no commitment from the AWS side.
upvoted 13 times
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manal001
Most Recent 1 month ago
Selected Answer: C
couldn't decide between B and C, but C seems right. The thing with reserved instances is that you have to commit for 1 or 3 years, which is not mentioned in this use case.
upvoted 2 times
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zdi561
1 month, 4 weeks ago
Selected Answer: C
Though ASG is not mentioned but it is implied. Mixing on-demand and spot is the best to save money. Reserved is expensive because you need to pay on the capacity all times.
upvoted 1 times
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satyaammm
1 month, 4 weeks ago
Selected Answer: B
Since Reserved Instances are cheaper than On-Demand and also Spot Instances are best suited here for additional requitements.
upvoted 1 times
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PaulGa
5 months, 2 weeks ago
Selected Answer: B
Ans B - Reserved guarantees baseline level operation; Spot for peaks - its stateless
upvoted 2 times
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jaradat02
8 months ago
Selected Answer: B
B is the correct answer, using reserved instances is definitely more cost effective than using on-demand instances.
upvoted 2 times
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ChymKuBoy
9 months, 2 weeks ago
Selected Answer: B
B for sure
upvoted 1 times
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ManikRoy
11 months ago
Selected Answer: B
Agree with others
upvoted 1 times
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pentium75
1 year, 3 months ago
Selected Answer: B
This is a bit unclear, but B seems the best option of the ones given. Usage is either "heavy" (during the 8 hours), "moderate and steady" (overnight) or "low" (during weekends). So there is always SOME usage, which could be covered by a few Reserved Instances (which would be cheaper than On-Demand Instances). A - "Spot instances for the entire workload", might 'affect the availability of the application' B - Seems the best answer C - More expensive than B D - Dedicated instances aka dedicated hardware -> very expensive
upvoted 6 times
awsgeek75
1 year, 2 months ago
Agree, very little clarity between B and C but B makes more sense.
upvoted 3 times
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HackPack
1 year, 3 months ago
I vote for C: Please explain me if I am wrong: If application experiences heavy usage during an 8-hour period each business day and all other time we don't need them? it mean than on-demand price will be only 33% from total cost so saving will be near 66%, more than reserved instances all other load we can cover by spot instances. So why it not C?
upvoted 1 times
dungtrungpham
1 year, 1 month ago
You got it wrong. You need the application all the time (24/7) because it says: "moderate and steady overnight, low usage at the weekend", not 8 hours a day
upvoted 4 times
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VladanO
1 year, 4 months ago
Selected Answer: C On-Demand Instances are more appropriate than Reserved Instances because "The application is used heavily for a period of 8 hours every weekday" requirements.
upvoted 2 times
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rcptryk
1 year, 4 months ago
Selected Answer: C
The answer should be C. Because if reserved is chosen, you have to pay for every hour. I calculate from this pages (if I'm wrong please correct me) https://aws.amazon.com/ec2/pricing/reserved-instances/pricing/#:~:text=Reserved%20Instances%20provide%20you%20with,instances%20when%20you%20need%20them. Example: for t4g.nano Reserved instances (0.003X24X365)+(1.90X12)=49.08 On demand instance (0.0042X8X365)=12.264 it will be added spot instances
upvoted 3 times
pentium75
1 year, 3 months ago
"The baseline level of usage" is the minimum usage that is always there (even at night and during weekends), for THAT you can use Reserved Instance.
upvoted 4 times
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Marco_St
1 year, 4 months ago
Selected Answer: B
B, since the application needs to be on 24/7 for business days; on weekends, it can be off at any moment. The question mentions something like 8 hour per business day but!!! this is just for heavy usage, the application is also on during overnight.
upvoted 2 times
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Juliez
1 year, 4 months ago
Why it's not A ? the application is "stateless" so it can be interrupted at any moment and the spot option is the cheaper one.
upvoted 2 times
vi24
1 year ago
The statelessness of a web application does not necessarily mean that it's okay to be interrupted. Statelessness refers to how the application handles requests and manages session data, not its ability to handle interruptions.
upvoted 1 times
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pentium75
1 year, 3 months ago
But there might not be any Spot Instances available and the app would go offline.
upvoted 2 times
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StudyAllNite
1 year, 5 months ago
Selected Answer: C
If we assume moderate usage of 8 hours on average every day a week, this should be on demand, since it is not a 24/7 server. There is downtime on the weekends and after the initial 8 hours.
upvoted 2 times
SVDK
1 year, 2 months ago
There is no downtime. The application runs all the time (even weekends). Weekends is the base workload which we cover with reserved instances, the higher workloads during the week is covered by spot instances.
upvoted 2 times
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ACloud_Guru15
1 year, 5 months ago
Selected Answer: C
Answer is C as the Jobs won't run for 24hrs/day hence Reserved instances is not required. As the Job runs for 8hrs/day we can choose On-Demand Instances
upvoted 2 times
pentium75
1 year, 3 months ago
Which jobs runs for 8 hrs/day? There are 8 hours/day of HEAVY usage, but the app runs 24/7.
upvoted 1 times
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C (25%)
B (20%)
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