The answer is that the replication task was stopped after the full load completed, which prevents the CDC phase from starting. In AWS DMS, a migration task must remain in a running state after the full load finishes in order to transition into the ongoing change data capture (CDC) phase; if the task is manually stopped or encounters a stop condition, the CDC engine never initializes. This scenario is a common trap on the AWS Certified Database Specialty DBS-C01 exam, where candidates must distinguish between a task that is stopped versus one that is pending or errored—the key clue is a stop date occurring shortly after the full load completes, not a failure count. Remember the memory tip: “Full load done, but task undone—CDC won’t run.”
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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.
Network Topology
Refer to the exhibit. A DBA is monitoring a DMS migration task from on-premises Oracle to Amazon RDS for Oracle. The full load completed successfully with 50 tables. However, the DBA notices that the CDC phase has not started. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The replication task was stopped after the full load completed
Option B is correct because if the task is stopped after full load, CDC will not start. The stop date is 1 hour after start, indicating the task stopped. Option A is wrong because tables loaded shows 50, not errored. Option C is wrong because DMS does not require manual CDC enable. Option D is wrong because the task might be stopped, not pending.
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.
✗
The task was not configured with CDC enabled
Why it's wrong here
If CDC were not enabled, the task would not have a CDC phase, but the exhibit does not indicate that.
✗
The full load encountered errors on some tables
Why it's wrong here
TablesErrored is 0, so no errors.
✗
The source Oracle database is not generating redo logs
Why it's wrong here
Even if redo logs are generated, the task must be running to capture them.
✓
The replication task was stopped after the full load completed
Why this is correct
The StopDate is set, indicating the task stopped before CDC could begin.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
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 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
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.
Deployment and Migration — This question tests Deployment and Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The replication task was stopped after the full load completed — Option B is correct because if the task is stopped after full load, CDC will not start. The stop date is 1 hour after start, indicating the task stopped. Option A is wrong because tables loaded shows 50, not errored. Option C is wrong because DMS does not require manual CDC enable. Option D is wrong because the task might be stopped, not pending.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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