DBS-C01 Deployment and Migration Practice Question
Exhibit
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"dms:CreateReplicationTask",
"dms:StartReplicationTask"
],
"Resource": "arn:aws:dms:us-east-1:123456789012:replication-task:*"
},
{
"Effect": "Allow",
"Action": [
"rds:DescribeDBInstances"
],
"Resource": "*"
}
]
}Refer to the exhibit. A database administrator is trying to use AWS DMS to migrate data from an on-premises Oracle database to Amazon RDS for Oracle. The DMS replication instance is in the same VPC as the RDS instance. The administrator receives an access denied error when starting the replication task. The IAM policy attached to the DMS replication instance is shown. What is the MOST likely cause of the error?
⚠ Common exam trap
It's easy for candidates to assume the error is due to network connectivity (Option C) or role association (Option D), but the exhibit clearly shows the IAM policy is missing source endpoint permissions, which is a common misconfiguration in DMS migrations.
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
✓
The IAM policy does not include permissions for the source database endpoint
The error occurs because the IAM policy attached to the DMS replication instance does not include the necessary permissions to access the source Oracle database endpoint. Specifically, the policy lacks actions like `dms:TestConnection` and `dms:DescribeEndpoints` that are required for DMS to validate and connect to the source endpoint. Without these permissions, DMS cannot establish the connection to the on-premises Oracle database, resulting in an access denied error when starting the replication task.
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 IAM policy does not include permissions for the source database endpoint
Why this is correct
DMS needs permissions to create and test endpoints, which are missing.
- ✗
The IAM policy does not allow the dms:CreateReplicationInstance action
Why it's wrong here
The error occurs when starting the task, not creating the instance.
- ✗
The RDS instance is not in the same VPC as the DMS replication instance
Why it's wrong here
The problem states they are in the same VPC.
- ✗
The DMS replication instance is not associated with the IAM role
Why it's wrong here
The policy is attached to the replication instance, but the instance needs a role with the policy.
Go deeper
Related to this question
About these practice questions
This DBS-C01 question is part of Courseiva's 1,663-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.