The correct answer is to migrate indices older than 30 days to UltraWarm nodes. This reduces OpenSearch log cost reduction using UltraWarm nodes by storing infrequently accessed data on cheaper, warm storage while keeping it searchable for the full 90-day compliance period. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of OpenSearch storage tiers and lifecycle policies—specifically that UltraWarm is designed for read-heavy, older data that doesn’t need the performance of hot nodes. A common trap is assuming you must delete old logs to save money, but that violates compliance; another is thinking cold storage (like S3 Glacier) is appropriate, but OpenSearch’s cold tier is separate and not for direct querying. Remember the memory tip: “Hot for now, Warm for later, Cold for archive”—for 90-day retention with 30-day active access, UltraWarm is the sweet spot.
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 uses a centralized logging solution with Amazon OpenSearch Service. The log volume has grown significantly, increasing costs. The logs are retained for 90 days for compliance, but only the last 30 days are frequently accessed. Which combination of actions would reduce costs without compromising compliance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Migrate indices older than 30 days to UltraWarm nodes.
Using UltraWarm nodes for older data reduces storage costs while retaining data for 90 days. Option A is wrong because deleting data after 30 days violates compliance. Option C is wrong because increasing instance count increases costs. Option D is wrong because cold storage retrieval is not appropriate for OpenSearch.
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.
✗
Move the logs to Amazon S3 Glacier and use a Lambda function to query them.
Why it's wrong here
Querying Glacier directly is not supported; this would break the logging solution.
✗
Increase the number of data nodes to improve indexing performance.
Why it's wrong here
More nodes increase costs, not reduce.
✓
Migrate indices older than 30 days to UltraWarm nodes.
Why this is correct
UltraWarm provides cost-effective storage for infrequently accessed data.
Related concept
Static NAT maps one inside address to one outside address.
✗
Configure an index lifecycle policy to delete indices older than 30 days.
Why it's wrong here
Deleting data before 90 days violates compliance.
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: Migrate indices older than 30 days to UltraWarm nodes. — Using UltraWarm nodes for older data reduces storage costs while retaining data for 90 days. Option A is wrong because deleting data after 30 days violates compliance. Option C is wrong because increasing instance count increases costs. Option D is wrong because cold storage retrieval is not appropriate for OpenSearch.
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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