Question 1,714 of 1,663
DBS-C01 Database Security Practice Question
Exhibit
{
"Statement": [
{
"Effect": "Allow",
"Action": "rds:CreateDBSecurityGroup",
"Resource": "*"
},
{
"Effect": "Allow",
"Action": [
"rds:AuthorizeDBSecurityGroupIngress",
"rds:RevokeDBSecurityGroupIngress"
],
"Resource": "arn:aws:rds:us-east-1:123456789012:secgrp:my-security-group"
}
]
}Refer to the exhibit. A database administrator has this IAM policy attached to their user. They are trying to authorize ingress to a DB security group named 'my-security-group' in the us-east-1 region. The operation fails. What is the most likely reason?
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 user is missing the 'rds:DescribeDBSecurityGroups' permission, which is required to perform the authorize operation.
The policy grants the `rds:AuthorizeDBSecurityGroupIngress` action on a specific DB security group. However, to authorize ingress, the user must also be able to describe the security group to verify its existence and details. The policy does not include `rds:DescribeDBSecurityGroups`, which is a prerequisite for the authorization operation. Therefore, the operation fails due to missing describe permission.
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 user is not allowed to create DB security groups, which is a prerequisite.
Why it's wrong here
The user has permission to create security groups.
- ✗
The policy does not grant 'rds:AuthorizeDBSecurityGroupIngress' on the specific security group.
Why it's wrong here
The policy does grant it on that ARN.
- ✗
The security group ARN in the policy is incorrect; it should include the security group ID instead of the name.
Why it's wrong here
ARN uses the name, not ID.
- ✓
The user is missing the 'rds:DescribeDBSecurityGroups' permission, which is required to perform the authorize operation.
Why this is correct
IAM requires the corresponding Describe action for many APIs.
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Last reviewed: Jun 20, 2026
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