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Exam AWS-SysOps topic 1 question 868 discussion

Exam question from Amazon's AWS-SysOps
Question #: 868
Topic #: 1
[All AWS-SysOps Questions]

A medical imaging company needs to process large amounts of imaging data in real time using a specific instance type. The company wants to guarantee sufficient resource capacity for 1 year.
Which action will meet these requirements in the MOST cost-effective manner?

  • A. Create 1-year On-Demand Capacity Reservations in the specific Availability Zones.
  • B. Launch Amazon EC2 instances with termination protection enabled.
  • C. Purchase 1-year Reserved Instances in the specific Availability Zones.
  • D. Use a Spot Fleet across multiple Availability Zones.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
On-demand capacity reservation in AZ is the only logical way to guarante resource capacity for a specific period of time. You cannot use spot fleet since it can terminate anytime. Reserved instances are also not a viable option because the images need resource capacity continuously.
by Newguru2020 at Nov. 1, 2020, 8:24 p.m.
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Newguru2020
Highly Voted 2 years, 7 months ago
Ans: C Keywords: "Specific Instance Type" and "1 year". Purchasing 1-year reserved instances would be helpful in most cost-effective way
upvoted 11 times
ImranR
2 years, 7 months ago
Agree...First I inclined towards A because of capacity reservation but due to "specific Instance Type" views changed to C Reserved Instance...
upvoted 1 times
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albert_kuo
Most Recent 9 months, 1 week ago
Selected Answer: C
Reserved Instances offer significant cost savings compared to On-Demand instances. By purchasing Reserved Instances for a 1-year term, the medical imaging company can ensure that the required instance type will be available in the specified Availability Zones throughout the year. This reservation provides capacity assurance and locks in a lower hourly rate for the instance type.
upvoted 1 times
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softarts
1 year, 8 months ago
saw this question in neal's practice, I think it is A because it need adequate resource capacity
upvoted 1 times
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Cyril_the_Squirl
2 years, 6 months ago
The answer is C. There's no set of circumstances under which On-Demand can ever be MORE cost effective that RI. With RIs we're talking about cost savings of up to 70+%.
upvoted 1 times
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RicardoD
2 years, 6 months ago
C is the answer
upvoted 1 times
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Kimle
2 years, 6 months ago
it's A .. just a matter of taxonomy , nothing is called on-demand capacity reservation .. it's either you have your ec2 "on demand" or reserved
upvoted 1 times
Rijndael
2 years, 6 months ago
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capacity-reservations.html That link also states that Capacity Reservation does not provide a billing discount where RI does. making RI more cost effective, making the answer C
upvoted 2 times
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arvsrv
2 years, 6 months ago
I would go with A, Keyword here is "Capacity Reservations", Since it's not mention in the questions they needed it for 24x7 (in that case Option C is correct). They want to have the capacity anytime when they run the instance. may be 2 days in a week or 10 days in a month.
upvoted 1 times
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JyotiZ
2 years, 6 months ago
c. you can use Savings Plans and regional Reserved Instances with your Capacity Reservations to benefit from billing discounts. AWS automatically applies your discount when the attributes of a Capacity Reservation match the attributes of a Savings Plan or regional Reserved Instance.
upvoted 1 times
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juanY
2 years, 6 months ago
I'll go with C because the question have this keywords "in the MOST cost-effective manner"
upvoted 2 times
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abhishek_m_86
2 years, 6 months ago
C. Purchase 1-year Reserved Instances in the specific Availability Zones. Seem correct
upvoted 2 times
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jackdryan
2 years, 7 months ago
I'll go with C
upvoted 1 times
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A3A3
2 years, 7 months ago
Capacity Reservations dont get you billing discounts, so its not A, B does nothing for cost savings, C is the best option. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capacity-reservations.html
upvoted 1 times
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kenkct
2 years, 7 months ago
I had different opinion, Due to the question is asking for : Sufficient Capacity for 1 year" Ans: A is correct
upvoted 2 times
SysOps
2 years, 6 months ago
Correct answer is C ============================== https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-reserved-instances.html "A zonal Reserved Instance—a Reserved Instance that is purchased for a specific Availability Zone— provides capacity reservation as well as a discount." ==============================
upvoted 1 times
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jtzt2003
2 years, 7 months ago
The answer asks for most cost efficient, therefore C is correct. If you Reserve Instances in an AZ as opposed to a region, you can also reserve capacity: https://aws.amazon.com/premiumsupport/knowledge-center/ri-reserved-capacity/
upvoted 3 times
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