- A
Enable supplemental logging on the source Oracle database manually.
DMS requires supplemental logging for CDC.
- B
Recreate the DMS endpoint for the source database with a new connection.
Why wrong: Recreating the endpoint does not enable supplemental logging.
- C
Modify the target MySQL database to use a different engine version.
Why wrong: Target engine version is unrelated to source logging.
- D
Increase the task log interval in the DMS task settings.
Why wrong: Log interval does not enable supplemental logging.
Question 1,243 of 1,786
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 company uses AWS DMS to replicate data from an on-premises Oracle database to Amazon RDS for MySQL. The full load completes successfully, but ongoing replication (CDC) is failing with a 'Failed to add supplemental logging' error. What should the data engineer do to resolve this issue?
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
✓
Enable supplemental logging on the source Oracle database manually.
The 'Failed to add supplemental logging' error occurs because AWS DMS requires supplemental logging on the source Oracle database for CDC to capture changes. DMS typically attempts to add supplemental logging automatically, but if it fails (e.g., due to insufficient privileges), the engineer must enable it manually. Option A is correct: enabling supplemental logging manually resolves the issue. Option B is incorrect because recreating the endpoint does not address the missing supplemental logging. Option C is incorrect because the target MySQL engine version is unrelated to the source Oracle logging requirement. Option D is incorrect because increasing the task log interval only affects log output frequency, not the underlying logging configuration.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable supplemental logging on the source Oracle database manually.
Why this is correct
DMS requires supplemental logging for CDC.
Related concept
Authentication checks who the user is.
- ✗
Recreate the DMS endpoint for the source database with a new connection.
Why it's wrong here
Recreating the endpoint does not enable supplemental logging.
- ✗
Modify the target MySQL database to use a different engine version.
Why it's wrong here
Target engine version is unrelated to source logging.
- ✗
Increase the task log interval in the DMS task settings.
Why it's wrong here
Log interval does not enable supplemental logging.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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. Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DEA-C01 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Operations and Support — This question tests Data Operations and Support — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Enable supplemental logging on the source Oracle database manually. — The 'Failed to add supplemental logging' error occurs because AWS DMS requires supplemental logging on the source Oracle database for CDC to capture changes. DMS typically attempts to add supplemental logging automatically, but if it fails (e.g., due to insufficient privileges), the engineer must enable it manually. Option A is correct: enabling supplemental logging manually resolves the issue. Option B is incorrect because recreating the endpoint does not address the missing supplemental logging. Option C is incorrect because the target MySQL engine version is unrelated to the source Oracle logging requirement. Option D is incorrect because increasing the task log interval only affects log output frequency, not the underlying logging configuration.
What should I do if I get this DEA-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DEA-C01 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jun 20, 2026
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