Quick Answer
The answer is to review the DB instance error logs in Amazon CloudWatch. This is the correct next step because when security groups and network ACLs are properly configured, connection failures often stem from database-level issues such as authentication errors, exhausted connection pools, or storage limits, all of which are recorded in the RDS instance’s error logs. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of the diagnostic workflow: always rule out network and OS-level controls first, then move to database logs before attempting changes like rebooting or modifying parameter groups. A common trap is jumping to a fix (like rebooting) instead of gathering evidence from logs. Remember the mnemonic “Net, Log, Fix” — verify network, check logs, then apply a solution.
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 database administrator is troubleshooting an issue where an Amazon RDS for PostgreSQL DB instance is not allowing connections. The administrator checks the security group and network ACLs, and they are correctly configured. What is the next step to diagnose the issue?
Reboot the DB instance
Why wrong: Rebooting may temporarily fix but does not diagnose.
Modify the DB instance's parameter group
Why wrong: Changing parameters is not a diagnostic step.
Create a DB snapshot
Why wrong: Snapshot is for backup, not diagnosis.
Review the DB instance error logs in Amazon CloudWatch
Logs can show reason for connection failures.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Review the DB instance error logs in Amazon CloudWatch
Option A is correct because checking DB instance logs can reveal connection issues like authentication failures or max connections reached. Option B is wrong because rebooting may not resolve the underlying issue. Option C is wrong because modifying the parameter group is not diagnostic. Option D is wrong because creating a snapshot is not a diagnostic step.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Reboot the DB instance
Why it's wrong here
Rebooting may temporarily fix but does not diagnose.
Modify the DB instance's parameter group
Why it's wrong here
Changing parameters is not a diagnostic step.
Create a DB snapshot
Why it's wrong here
Snapshot is for backup, not diagnosis.
Review the DB instance error logs in Amazon CloudWatch
Why this is correct
Logs can show reason for connection failures.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
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
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Standard ACLs match source addresses..
The correct answer is: Review the DB instance error logs in Amazon CloudWatch — Option A is correct because checking DB instance logs can reveal connection issues like authentication failures or max connections reached. Option B is wrong because rebooting may not resolve the underlying issue. Option C is wrong because modifying the parameter group is not diagnostic. Option D is wrong because creating a snapshot is not a diagnostic step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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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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