The correct answer is to configure the JDBC connection string with a timeout and implement automatic retry logic. This works because during an RDS failover, the Multi-AZ standby promotes to primary, causing a brief DNS change and connection interruption; a JDBC timeout ensures the application stops waiting for a dead connection quickly, while retry logic allows it to re-establish a new connection to the promoted instance. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of application-layer resilience versus infrastructure fixes—a common trap is assuming RDS Proxy alone eliminates the need for retries, but it only reduces failover time, not the need for client-side recovery. Remember the memory tip: “Timeout to drop, retry to hop”—the timeout drops the stale connection, and the retry logic hops to the new primary.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
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. The operations team notices that during a failover, the application experiences errors for about 2 minutes. The application uses a JDBC connection pool. Which solution should the team implement to reduce the failover impact?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the JDBC connection string with a timeout and implement automatic retry logic.
Option C is correct because using a custom JDBC URL with a timeout and retry logic allows the application to reconnect after failover. Option A is wrong because RDS proxy does not eliminate the need for application retry logic. Option B is wrong because increasing the TTL does not affect the connection timeout. Option D is wrong because a Lambda function does not directly improve failover recovery.
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 Amazon CloudWatch Events to trigger a Lambda function that restarts the application.
Why it's wrong here
Restarting the application is not necessary; retry is sufficient.
✗
Use Amazon RDS Proxy to manage database connections.
Why it's wrong here
RDS Proxy pools connections but still requires application retry logic.
✓
Configure the JDBC connection string with a timeout and implement automatic retry logic.
Why this is correct
Retry logic allows the application to reconnect after failover.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the TTL for the RDS DNS record to 60 seconds.
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 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
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 SAP-C02 NAT questions on configuration and troubleshooting.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure the JDBC connection string with a timeout and implement automatic retry logic. — Option C is correct because using a custom JDBC URL with a timeout and retry logic allows the application to reconnect after failover. Option A is wrong because RDS proxy does not eliminate the need for application retry logic. Option B is wrong because increasing the TTL does not affect the connection timeout. Option D is wrong because a Lambda function does not directly improve failover recovery.
What should I do if I get this SAP-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 SAP-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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