Exam AWS Certified Cloud Practitioner CLF-C02 topic 1 question 16 discussion

A. Reserved Instances (RIs): Reserved Instances provide capacity reservation for a specified term (usually one or three years), offering cost savings compared to On-Demand Instances. However, RIs may not be the most suitable for a short duration like 2 months, as they typically involve longer-term commitments. B. Dedicated Hosts: Dedicated Hosts may not be cost-effective for short-term workloads and lack the flexibility needed. C. Spot Instances: Spot Instances offer cost savings but can be terminated with short notice, potentially causing interruptions. D. On-Demand Instances: On-Demand Instances provide capacity on a pay-as-you-go basis with no upfront commitment. They are suitable for short-term, variable workloads, offering flexibility without the need for long-term commitments. In this scenario, On-Demand Instances would be a cost-effective option for the 2-month duration while avoiding downtime.

D - On-Demand Instances is correct. "On-Demand Instances are recommended for: • Users that prefer the low cost and flexibility of EC2 without any upfront payment or long-term commitment • Applications with short-term, spiky, or unpredictable workloads that cannot be interrupted • Applications being developed or tested on EC2 for the first time" Reference: https://aws.amazon.com/ec2/pricing/

D option

On-Demand Instances provide capacity on a pay-as-you-go basis with no upfront commitment. They are suitable for short-term, variable workloads, offering flexibility without the need for long-term commitments. In this scenario, On-Demand Instances would be a cost-effective option for the 2-month duration while avoiding downtime.

Reserved instances are also on-demand instances which must match certain attribute such as instance type and Region, in order to benefit from the billing discount. They are cheaper than On-Demand Instances but any on-demand instance which can be reserved must be reserved for at least for one year. This case scenario demands the application usage only for 2 months and hence Option A - Reserved instances cannot be an answer. With Spot instances once cannot guarantee 100% uptime and so that is also out of window. Dedicated host will be costly comparison to on-demand instance. Hence the answer id D. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-reserved-instances.html#:~:text=You%20can%20purchase%20a%20Reserved%20Instance%20for%20a%20one%2Dyear%20or%20three%2Dyear%20commitment%2C%20with%20the%20three%2Dyear%20commitment%20offering%20a%20bigger%20discount.

d is correct

D. On-Demand Instances: On-Demand Instances provide capacity on a pay-as-you-go basis with no upfront commitment. They are suitable for short-term, variable workloads, offering flexibility without the need for long-term commitments. In this scenario, On-Demand Instances would be a cost-effective option for the 2-month duration while avoiding downtime.

D = CORRECT

D - On-Demand Instances is correct. "On-Demand Instances are recommended for: • Users that prefer the low cost and flexibility of EC2 without any upfront payment or long-term commitment • Applications with short-term, spiky, or unpredictable workloads that cannot be interrupted • Applications being developed or tested on EC2 for the first time" Reference: https://aws.amazon.com/ec2/pricing/

I would say reserved because with a scheduled reserved instance, you can pay for scheduled time only

The most cost effective part threw me off . Cause ON demand is the most expensive isn't it?

The correct answer is D

Answer D is correct.

It can´t be A because AWS offer terms of 1 or 3 years and only need 2 month at year. So it has to be D

On-Demand is the correct answer since this service cannot be interrupted. This is why we need On-Demand.

the correct answer is a

The correct answer is D. Reference: https://aws.amazon.com/ec2/pricing/