- A
Create a new RDS instance with the desired settings, migrate the data using pg_dump, and update the application connection string.
Why wrong: Migration causes longer downtime and is more complex than necessary.
- B
Update the security group inbound rules to only allow traffic on port 5439 and enforce SSL at the network level.
Why wrong: Security group changes do not enforce SSL encryption at the database level.
- C
Modify the default DB parameter group to change the port and enable SSL, then apply it to the instance without a reboot.
Why wrong: Default parameter groups cannot be modified; you must use a custom parameter group.
- D
Modify the DB parameter group associated with the instance to set 'ssl' to '1' and 'port' to 5439. Reboot the instance to apply the changes.
Parameter changes require a reboot; this method has minimal downtime.
Quick Answer
The correct answer is to modify the DB parameter group associated with the instance to set 'ssl' to '1' and 'port' to 5439, then reboot the instance to apply the changes. This works because RDS PostgreSQL enforces SSL and changes the port at the database engine level through static parameters in a custom parameter group, which only take effect after a reboot. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding that static parameter changes require a reboot, while dynamic parameters apply immediately—a common trap is confusing the two or assuming security group rules alone enforce SSL. Remember that default parameter groups cannot be modified, so you must create a custom one. A key memory tip: static parameters need a restart, dynamic parameters are instant—for SSL and port changes, always plan for a brief reboot to achieve minimal downtime.
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 healthcare company runs a critical application on Amazon RDS for PostgreSQL with a Multi-AZ deployment. The database stores patient records and must comply with HIPAA regulations. Recently, a security audit revealed that the database is using the default port 5432 and that SSL connections are not enforced. The security team requires that all connections to the database use SSL and that the default port be changed to 5439 to reduce the risk of automated attacks. The database administrator needs to implement these changes with minimal downtime. What should the administrator do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Modify the DB parameter group associated with the instance to set 'ssl' to '1' and 'port' to 5439. Reboot the instance to apply the changes.
Option A is correct because modifying the DB parameter group to require SSL and changing the port, then rebooting the instance, applies the changes with minimal downtime (a few minutes). Option B is wrong because creating a new instance and migrating is more complex and longer downtime. Option C is wrong because changing the security group alone does not enforce SSL. Option D is wrong because using a custom DB parameter group is necessary; you cannot modify the default group.
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.
- ✗
Create a new RDS instance with the desired settings, migrate the data using pg_dump, and update the application connection string.
Why it's wrong here
Migration causes longer downtime and is more complex than necessary.
- ✗
Update the security group inbound rules to only allow traffic on port 5439 and enforce SSL at the network level.
Why it's wrong here
Security group changes do not enforce SSL encryption at the database level.
- ✗
Modify the default DB parameter group to change the port and enable SSL, then apply it to the instance without a reboot.
Why it's wrong here
Default parameter groups cannot be modified; you must use a custom parameter group.
- ✓
Modify the DB parameter group associated with the instance to set 'ssl' to '1' and 'port' to 5439. Reboot the instance to apply the changes.
Why this is correct
Parameter changes require a reboot; this method has minimal downtime.
Related concept
Static NAT maps one inside address to one outside address.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 DBS-C01 NAT questions on configuration and troubleshooting.
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Management and Operations — study guide chapter
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Management and Operations — This question tests Management and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Modify the DB parameter group associated with the instance to set 'ssl' to '1' and 'port' to 5439. Reboot the instance to apply the changes. — Option A is correct because modifying the DB parameter group to require SSL and changing the port, then rebooting the instance, applies the changes with minimal downtime (a few minutes). Option B is wrong because creating a new instance and migrating is more complex and longer downtime. Option C is wrong because changing the security group alone does not enforce SSL. Option D is wrong because using a custom DB parameter group is necessary; you cannot modify the default group.
What should I do if I get this DBS-C01 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 DBS-C01 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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Last reviewed: Jun 20, 2026
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.
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