- A
Amazon Inspector
Why wrong: Inspector is for vulnerability assessment.
- B
AWS Config
Why wrong: Config evaluates configuration rules but does not stream logs.
- C
AWS CloudTrail
CloudTrail records API calls that modify security group rules.
- D
Amazon CloudWatch Logs
CloudTrail logs can be streamed to CloudWatch Logs for monitoring.
- E
Amazon VPC Flow Logs
Why wrong: Flow Logs capture network traffic, not API calls.
Question 931 of 1,730
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 responsible for managing an Amazon RDS for Oracle DB instance. The DBA needs to ensure that all changes to the DB instance's security group rules are logged for audit purposes. Which TWO services can be used together to achieve this? (Select TWO.)
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
✓
AWS CloudTrail
AWS CloudTrail logs API calls made to the AWS account, including changes to security group rules (e.g., AuthorizeSecurityGroupIngress). By sending CloudTrail logs to Amazon CloudWatch Logs, you can create metrics filters and alarms to monitor and alert on specific API calls, enabling audit logging of security group rule changes. AWS Config tracks configuration changes but does not provide real-time log streaming to CloudWatch Logs for API calls. VPC Flow Logs capture network traffic, not API calls. Amazon Inspector is a vulnerability assessment service, not for logging API calls.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Inspector
Why it's wrong here
Inspector is for vulnerability assessment.
- ✗
AWS Config
Why it's wrong here
Config evaluates configuration rules but does not stream logs.
- ✓
AWS CloudTrail
Why this is correct
CloudTrail records API calls that modify security group rules.
Related concept
Standard ACLs match source addresses.
- ✓
Amazon CloudWatch Logs
Why this is correct
CloudTrail logs can be streamed to CloudWatch Logs for monitoring.
Related concept
Standard ACLs match source addresses.
- ✗
Amazon VPC Flow Logs
Why it's wrong here
Flow Logs capture network traffic, not API calls.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
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
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next 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.
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Management and Operations — study guide chapter
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Management and Operations practice questions
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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 — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: AWS CloudTrail — AWS CloudTrail logs API calls made to the AWS account, including changes to security group rules (e.g., AuthorizeSecurityGroupIngress). By sending CloudTrail logs to Amazon CloudWatch Logs, you can create metrics filters and alarms to monitor and alert on specific API calls, enabling audit logging of security group rule changes. AWS Config tracks configuration changes but does not provide real-time log streaming to CloudWatch Logs for API calls. VPC Flow Logs capture network traffic, not API calls. Amazon Inspector is a vulnerability assessment service, not for logging API calls.
What should I do if I get this DBS-C01 question wrong?
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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