SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 production workload on Amazon EC2 instances. The SysOps administrator wants to implement a cost optimization strategy that does not compromise availability. Which TWO actions should the administrator take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Spot Instances for fault-tolerant and stateless workloads.
Using Spot Instances for fault-tolerant workloads and purchasing Reserved Instances for steady-state usage reduce costs without affecting availability. Option A is wrong because terminating idle instances may affect availability if they are part of a cluster. Option B is wrong because using a single Availability Zone reduces availability. Option D is wrong because reducing instance sizes may degrade performance.
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.
✓
Use Spot Instances for fault-tolerant and stateless workloads.
Why this is correct
Spot Instances are cost-effective for flexible workloads.
Related concept
Static NAT maps one inside address to one outside address.
✗
Identify and terminate idle instances.
Why it's wrong here
Terminating instances may reduce capacity and affect availability.
✓
Purchase Reserved Instances for baseline capacity.
Why this is correct
Reserved Instances provide a discount for steady-state usage.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use smaller instance types for all workloads.
Why it's wrong here
May lead to performance degradation.
✗
Use a single Availability Zone to reduce data transfer costs.
Why it's wrong here
Reduces availability.
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: Use Spot Instances for fault-tolerant and stateless workloads. — Using Spot Instances for fault-tolerant workloads and purchasing Reserved Instances for steady-state usage reduce costs without affecting availability. Option A is wrong because terminating idle instances may affect availability if they are part of a cluster. Option B is wrong because using a single Availability Zone reduces availability. Option D is wrong because reducing instance sizes may degrade performance.
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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