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Exam AWS Certified SysOps Administrator - Associate topic 1 question 13 discussion

Exam question from Amazon's AWS Certified SysOps Administrator - Associate
Question #: 13
Topic #: 1
[All AWS Certified SysOps Administrator - Associate Questions]

A company is running distributed computing software to manage a fleet of 20 Amazon EC2 instances for calculations. The fleet includes 2 control nodes and 18 task nodes to run the calculations. Control nodes can automatically start the task nodes.
Currently, all the nodes run on demand. The control nodes must be available 24 hours a day, 7 days a week. The task nodes run for 4 hours each day. A SysOps administrator needs to optimize the cost of this solution.
Which combination of actions will meet these requirements? (Choose two.)

  • A. Purchase EC2 Instance Savings Plans for the control nodes.
  • B. Use Dedicated Hosts for the control nodes.
  • C. Use Reserved Instances for the task nodes.
  • D. Use Spot Instances for the control nodes. Use On-Demand Instances if there is no Spot availability.
  • E. Use Spot Instances for the task nodes. Use On-Demand Instances if there is no Spot availability.
Show Suggested Answer Hide Answer
Suggested Answer: AE 🗳️
by haxaffee at Aug. 30, 2022, 7:45 p.m.
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CVDON
Highly Voted 2 years, 2 months ago
A and E, but i would choose RI for control nodes as a better option.
upvoted 12 times
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Gomer
Highly Voted 2 years, 1 month ago
Can't be "C" and "E" because they are contradictory. Both of these answers suggest two different solutions for "task nodes". People who are choosing "C" are thinking its directed to "control nodes", but it is not. Answer has to be A and E. I'd agree that control nodes should be reserved instances, (or "A") but that is not what "C" is proposing. It's a trick question.
upvoted 6 times
piavik
2 years ago
C is not correct C. Use Reserved Instances for the TASK nodes. not CONTROL nodes
upvoted 5 times
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jepwi
Most Recent 3 weeks, 1 day ago
Selected Answer: AE
Key word is Optimize
upvoted 1 times
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numark
4 months, 3 weeks ago
Selected Answer: AE
Why would you purchase reserved for the task nodes that only need to run for 4 hours? I hope you are not on the AWS team in my company.
upvoted 1 times
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64rl0
7 months, 3 weeks ago
Selected Answer: AE
Answer is AE
upvoted 1 times
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stallionaws
8 months, 1 week ago
A and E are perfect for this Savings Plans for Control Nodes (Option A): Cost-Effectiveness: Savings Plans provide substantial cost savings for workloads that need to run continuously. Since control nodes need to be available 24/7, Savings Plans are an effective way to reduce costs while maintaining consistent availability. Flexibility: Savings Plans are more flexible than Reserved Instances as they apply to any instance usage within a specific region. Spot Instances for Task Nodes (Option E): Cost Reduction: Spot Instances can offer up to 90% savings over On-Demand prices, making them an excellent choice for non-critical, short-term workloads like the task nodes. Fallback Mechanism: By falling back to On-Demand Instances when Spot Instances are unavailable, you can ensure that the task nodes still execute as required without significant cost implications.
upvoted 1 times
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Mangesh_XI_mumbai
1 year, 5 months ago
Selected Answer: AE
how C&E, A&E, what about control nodes.
upvoted 1 times
Mangesh_XI_mumbai
1 year, 5 months ago
A&E seems correct.
upvoted 1 times
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DennisRichard
1 year, 6 months ago
These are not 'good' options in my opinion. Reserved instances for control nodes and spot block for task nodes would be more ideal.
upvoted 2 times
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callspace
1 year, 7 months ago
Selected Answer: AE
My Apologies. Overlooked Task nodes are suppose to be spot instances and control nodes needs to be 24/7. AE It is.
upvoted 1 times
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callspace
1 year, 7 months ago
Selected Answer: CE
As we know from the question - The control nodes must be available 24 hours a day, 7 days a week. CE appears to be tight choice. Reserved Instances can provide higher savings than Savings Plan for predictable workloads with consistent usage patterns. Savings Plan can provide higher savings than Reserved Instances for workloads with varying usage patterns or instance types. https://medium.com/@ekantmate/savings-plan-vs-reserved-instances-which-one-to-select-cdb8dba9facd
upvoted 3 times
flaacko
8 months ago
CE is not the most cost effective choice because option C recommends using reserved instances for the task nodes which run only 4 hours a day. By using reserved instances you are commiting to paying for a on-demand instances on a per hour basis for a term of 1 or 3 years. Imagine paying for something every 24 hours in a day for a year or 3 years when you only need to use it for 4 hours each. Doesn't sound cost effective right? It will make sense if you were using reserved instances for the control nodes that need to run 24/7. For the control nodes however, saving plans are still a better choice as they offer more flexibility over reserved instances.
upvoted 1 times
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sisover
1 year, 9 months ago
Selected Answer: AE
I disagre that C is the correct one. How can we ask them to correct this one ?
upvoted 1 times
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shivangee
1 year, 9 months ago
A and E A. Purchase EC2 Instance Savings Plans for the control nodes.
upvoted 2 times
jipark
1 year, 8 months ago
thanks a lot. now I got to know "control node" and "task nodes" - reserved
upvoted 1 times
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nizammusasoac02
1 year, 9 months ago
Selected Answer: AE
A and E
upvoted 2 times
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BietTuot
2 years, 4 months ago
Selected Answer: AE
A and E
upvoted 1 times
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michaldavid
2 years, 4 months ago
Selected Answer: AE
A and E
upvoted 1 times
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pravinb
2 years, 5 months ago
A and E make more sense if we compare all other options.. we cant use spot instances for control nodes..
upvoted 1 times
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mlantonis2
2 years, 5 months ago
A and E.
upvoted 1 times
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