SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a web application on EC2 instances behind an Application Load Balancer. The application experiences variable traffic patterns. The operations team notices that during low traffic periods, there are still a large number of running instances, leading to higher costs. What should the team do to reduce costs while maintaining performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a target tracking scaling policy based on average CPU utilization.
Using a target tracking scaling policy based on average CPU utilization allows the Auto Scaling group to automatically adjust the number of instances based on demand, reducing costs during low traffic. Option A is wrong because manual scaling does not automate cost optimization. Option B is wrong because Reserved Instances do not address variable traffic. Option D is wrong because increasing instance size may not reduce the number of instances during low traffic.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Replace the existing instances with larger instance types to handle peak load.
Why it's wrong here
Larger instances still run during low traffic, potentially increasing costs.
✓
Implement a target tracking scaling policy based on average CPU utilization.
Why this is correct
Automatically adjusts capacity based on demand, lowering costs during low traffic.
Related concept
Static NAT maps one inside address to one outside address.
✗
Manually scale down the number of instances during off-peak hours.
Why it's wrong here
Manual scaling is not automated and may lead to delays or errors.
✗
Purchase Reserved Instances for the baseline capacity.
Why it's wrong here
Reserved Instances reduce per-hour cost but do not automatically scale down.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Cost and Performance Optimization — This question tests Cost and Performance Optimization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Implement a target tracking scaling policy based on average CPU utilization. — Using a target tracking scaling policy based on average CPU utilization allows the Auto Scaling group to automatically adjust the number of instances based on demand, reducing costs during low traffic. Option A is wrong because manual scaling does not automate cost optimization. Option B is wrong because Reserved Instances do not address variable traffic. Option D is wrong because increasing instance size may not reduce the number of instances during low traffic.
What should I do if I get this SOA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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