Question 1,600 of 1,663
DBS-C01 Deployment and Migration Practice Question
Exhibit
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"dms:CreateEndpoint",
"dms:ModifyEndpoint",
"dms:DescribeEndpoints"
],
"Resource": "*"
},
{
"Effect": "Allow",
"Action": [
"rds:DescribeDBInstances",
"rds:ModifyDBInstance"
],
"Resource": "arn:aws:rds:us-east-1:123456789012:db:target-db"
}
]
}A team is setting up a DMS migration task. The IAM policy above is attached to the DMS replication instance's IAM role. The team is unable to modify the target RDS instance's maintenance window during the migration. Which additional permission is missing?
⚠ Common exam trap
Test-takers frequently confuse the permissions needed for modifying the target RDS instance's maintenance window with permissions for modifying the DMS replication instance or RDS option groups, leading them to select options B or C instead of the correct `rds:ModifyDBInstance` permission.
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
✓
Add 'rds:ModifyDBInstance' permission for the target RDS instance.
Modifying the target RDS instance's maintenance window requires the `rds:ModifyDBInstance` permission. The DMS replication instance's IAM role must have this permission for the target RDS instance to allow the migration task to adjust the maintenance window, which is necessary to prevent conflicts during ongoing replication. Without this permission, the DMS task cannot alter the maintenance window, even if the IAM role has other RDS permissions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Add 'rds:ModifyDBInstance' permission for the target RDS instance.
Why this is correct
The DMS replication instance's IAM role needs the `rds:ModifyDBInstance` permission on the target RDS instance to change its maintenance window. Without this permission, the migration task cannot adjust the window.
- ✗
Add 'rds:ModifyOptionGroup' permission for the target RDS instance.
Why it's wrong here
The `rds:ModifyOptionGroup` permission is for modifying option groups, not the maintenance window of an RDS instance.
- ✗
Add 'dms:ModifyReplicationInstance' permission for the DMS replication instance.
Why it's wrong here
The `dms:ModifyReplicationInstance` permission is for modifying the DMS replication instance itself, not the target RDS instance's maintenance window.
- ✗
Add 'ec2:DescribeVpcs' permission to the policy.
Why it's wrong here
The `ec2:DescribeVpcs` permission is not required for modifying the target RDS instance's maintenance window.
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Last reviewed: Jun 11, 2026
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