The action will be denied because the condition does not match. In AWS DMS, an IAM policy can restrict task creation by evaluating the source engine type through a condition key like `dms:SourceEngineName`, and when the policy explicitly requires Oracle, any attempt with a MySQL source fails the condition evaluation, resulting in an explicit deny. This scenario tests your understanding of how IAM condition keys enforce granular permissions on DMS resources, a frequent topic on the AWS Certified Database Specialty DBS-C01 exam where you must distinguish between a denied action and a policy error. A common trap is confusing a condition mismatch with a syntax error—remember that a condition that doesn’t evaluate to true simply denies the request, it doesn’t throw an error. Memory tip: think of IAM conditions as gatekeepers—if the engine name doesn’t match the key, the gate stays closed.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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.
Refer to the exhibit. An IAM policy allows creation of a DMS replication task only if the source database engine is Oracle. A user attempts to create a replication task with a MySQL source. What will happen?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The action will be denied because the condition does not match.
The condition requires the database engine to be Oracle. Since MySQL does not match, the action is not allowed. Option B is correct. Option A (Denied) would be correct but the explanation clarifies. Option C (Allowed) is incorrect. Option D (Error) is not correct.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 action will fail with an error because the policy is malformed.
Why it's wrong here
Policy is valid.
✗
The action will succeed but the task will fail later.
Why it's wrong here
The policy denies the API call.
✗
The action will be allowed because the resource is '*'.
Why it's wrong here
Condition restricts to Oracle.
✓
The action will be denied because the condition does not match.
Why this is correct
Condition fails for MySQL.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Deployment and Migration — This question tests Deployment and Migration — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The action will be denied because the condition does not match. — The condition requires the database engine to be Oracle. Since MySQL does not match, the action is not allowed. Option B is correct. Option A (Denied) would be correct but the explanation clarifies. Option C (Allowed) is incorrect. Option D (Error) is not correct.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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