This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 Amazon RDS for MySQL with Multi-AZ deployment. The database experiences occasional read replica lag of up to 5 seconds. The application requires read-after-write consistency. Which action should the company take to improve the solution?
Modify the application to always read from the primary instance.
Primary instance provides strong consistency.
Increase the number of read replicas to distribute the load.
Why wrong: More replicas do not reduce lag.
Implement Amazon ElastiCache to cache read results.
Why wrong: Caching may serve stale data.
Use Amazon RDS Proxy to route read queries to the read replica.
Why wrong: RDS Proxy does not guarantee read-after-write consistency.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Modify the application to always read from the primary instance.
Option C is correct because reading from the primary instance ensures strong consistency. Option A is wrong because RDS Proxy does not eliminate read replica lag. Option B is wrong because adding more read replicas does not solve consistency. Option D is wrong because ElastiCache is for caching, not consistency.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Modify the application to always read from the primary instance.
Why this is correct
Primary instance provides strong consistency.
Related concept
Static NAT maps one inside address to one outside address.
Increase the number of read replicas to distribute the load.
Why it's wrong here
More replicas do not reduce lag.
Implement Amazon ElastiCache to cache read results.
Why it's wrong here
Caching may serve stale data.
Use Amazon RDS Proxy to route read queries to the read replica.
Why it's wrong here
RDS Proxy does not guarantee read-after-write consistency.
Common exam traps
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
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.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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 SAP-C02 NAT questions on configuration and troubleshooting.
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FAQ
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Static NAT maps one inside address to one outside address..
The correct answer is: Modify the application to always read from the primary instance. — Option C is correct because reading from the primary instance ensures strong consistency. Option A is wrong because RDS Proxy does not eliminate read replica lag. Option B is wrong because adding more read replicas does not solve consistency. Option D is wrong because ElastiCache is for caching, not consistency.
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 SAP-C02 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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