This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is migrating an on-premises Oracle database to Amazon RDS for Oracle. The database uses Oracle Data Guard for disaster recovery. Which AWS service should be used to monitor the replication lag between the source and target databases during migration?
Amazon RDS Performance Insights
Why wrong: Performance Insights focuses on query performance, not replication lag.
AWS Database Migration Service (AWS DMS)
DMS provides replication lag metrics during migration.
Amazon CloudWatch
Why wrong: CloudWatch monitors DMS metrics but the question asks for the service to use; DMS is more specific.
AWS CloudTrail
Why wrong: CloudTrail records API calls, not replication metrics.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Database Migration Service (AWS DMS)
Option B is correct because AWS DMS provides metrics for replication lag. Option A is wrong because CloudWatch can monitor DMS metrics but is not specific to Data Guard. Option C is wrong because RDS Performance Insights does not monitor replication lag. Option D is wrong because CloudTrail does not monitor replication lag.
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.
Amazon RDS Performance Insights
Why it's wrong here
Performance Insights focuses on query performance, not replication lag.
AWS Database Migration Service (AWS DMS)
Why this is correct
DMS provides replication lag metrics during migration.
Related concept
Standard ACLs match source addresses.
Amazon CloudWatch
Why it's wrong here
CloudWatch monitors DMS metrics but the question asks for the service to use; DMS is more specific.
AWS CloudTrail
Why it's wrong here
CloudTrail records API calls, not replication metrics.
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 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. 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. 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 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: AWS Database Migration Service (AWS DMS) — Option B is correct because AWS DMS provides metrics for replication lag. Option A is wrong because CloudWatch can monitor DMS metrics but is not specific to Data Guard. Option C is wrong because RDS Performance Insights does not monitor replication lag. Option D is wrong because CloudTrail does not monitor replication lag.
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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