The answer is the missing `dms:CreateEndpoint` permission. This is correct because when you create a DMS replication task, the service must first create the source and target endpoints that define the database connections; without explicit permission to create these endpoint resources, the task creation fails with an authorization error, even if other permissions like `dms:CreateReplicationTask` are present. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of the dependency chain in DMS resource creation—a common trap is assuming that only the task-level action is needed, when in fact the endpoint creation is a prerequisite. Remember the memory tip: "No endpoint, no task—DMS needs both to ask."
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.
Exhibit
Refer to the exhibit.
```json
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"dms:CreateReplicationTask",
"dms:StartReplicationTask"
],
"Resource": "*"
},
{
"Effect": "Allow",
"Action": [
"rds:DescribeDBInstances"
],
"Resource": "*"
}
]
}
```
An IAM policy is attached to a user to allow migration tasks. When the user tries to create a DMS replication task, they get an authorization error.
A user has the IAM policy shown in the exhibit. When attempting to create a DMS replication task, they receive an authorization error. What is the most likely missing permission?
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.
Refer to the exhibit.
```json
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"dms:CreateReplicationTask",
"dms:StartReplicationTask"
],
"Resource": "*"
},
{
"Effect": "Allow",
"Action": [
"rds:DescribeDBInstances"
],
"Resource": "*"
}
]
}
```
An IAM policy is attached to a user to allow migration tasks. When the user tries to create a DMS replication task, they get an authorization error.
A
ec2:DescribeSecurityGroups to allow network configuration
Why wrong: EC2 permissions are not required for the user; DMS uses a replication instance.
B
dms:CreateEndpoint permission
The policy lacks permission to create endpoints, which are required for the replication task.
C
s3:PutObject for the S3 bucket
Why wrong: S3 permissions are not required for creating a replication task unless using S3 as a source or target.
D
logs:CreateLogGroup to enable logging
Why wrong: Logging is not required for task creation.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
dms:CreateEndpoint permission
Option C is correct because creating a DMS replication task requires permissions to create the DMS endpoint resources, which are not included in the policy. Option A is wrong because S3 permissions are not needed for a basic task. Option B is wrong because EC2 permissions are not required. Option D is wrong because CloudWatch Logs permissions are not required at creation time.
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.
✗
ec2:DescribeSecurityGroups to allow network configuration
Why it's wrong here
EC2 permissions are not required for the user; DMS uses a replication instance.
✓
dms:CreateEndpoint permission
Why this is correct
The policy lacks permission to create endpoints, which are required for the replication task.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
s3:PutObject for the S3 bucket
Why it's wrong here
S3 permissions are not required for creating a replication task unless using S3 as a source or target.
✗
logs:CreateLogGroup to enable logging
Why it's wrong here
Logging is not required for task creation.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 DBS-C01 questions on access control and AAA configuration.
Deployment and Migration — This question tests Deployment and Migration — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: dms:CreateEndpoint permission — Option C is correct because creating a DMS replication task requires permissions to create the DMS endpoint resources, which are not included in the policy. Option A is wrong because S3 permissions are not needed for a basic task. Option B is wrong because EC2 permissions are not required. Option D is wrong because CloudWatch Logs permissions are not required at creation time.
What should I do if I get this DBS-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 DBS-C01 questions on access control and AAA configuration.
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?
Authentication checks who the user is.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. An IAM policy is attached to a user who will manage AWS DMS tasks. When the user tries to start a replication task, they receive an access denied error. What is the most likely cause?
medium
A.The policy does not allow rds:DescribeDBInstances
B.The policy does not allow the dms:StartReplicationTask action
✓ C.The policy is missing permissions to describe endpoints and connections
D.The policy does not allow dms:CreateReplicationTask
Why C: Option A is correct because the policy does not include dms:StartReplicationTask, only dms:StartReplicationTask is not present (the action is StartReplicationTask, not StartReplicationTask? Actually the policy has StartReplicationTask, so that should be fine. Wait, the policy does include dms:StartReplicationTask. So the error might be due to missing DescribeEndpoints. Option D is plausible. Let's re-evaluate. The policy includes StartReplicationTask, so A is not correct. The user might need dms:DescribeEndpoints to start a task. So D is correct.
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Question Discussion
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