This DBS-C01 practice question tests your understanding of database security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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. 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?
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.
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 allows 'AuthorizeDBSecurityGroupIngress' on the specific security group ARN. However, the ARN format is incorrect. The correct ARN for a DB security group is 'arn:aws:rds:us-east-1:123456789012:secgrp:my-security-group'? Actually, the resource type is 'secgrp'? No, the correct resource type is 'security-group'? In AWS RDS, the resource type for DB security groups is 'secgrp'? Wait, let's check: For RDS DB security groups, the resource type in IAM is 'secgrp'? Actually, the ARN format is 'arn:aws:rds:region:account:secgrp:security-group-name'. So the ARN in the policy is correct? The issue might be that the security group does not exist or is in a different region. However, the most common mistake is that the user also needs permission to 'rds:DescribeDBSecurityGroups' to view the security group. Option A is a valid explanation. Option B is wrong because the policy does allow the action on that resource. Option C is wrong because the policy allows the action. Option D is wrong because the user can create security groups.
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 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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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.
Database Security — This question tests Database Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The user is missing the 'rds:DescribeDBSecurityGroups' permission, which is required to perform the authorize operation. — The policy allows 'AuthorizeDBSecurityGroupIngress' on the specific security group ARN. However, the ARN format is incorrect. The correct ARN for a DB security group is 'arn:aws:rds:us-east-1:123456789012:secgrp:my-security-group'? Actually, the resource type is 'secgrp'? No, the correct resource type is 'security-group'? In AWS RDS, the resource type for DB security groups is 'secgrp'? Wait, let's check: For RDS DB security groups, the resource type in IAM is 'secgrp'? Actually, the ARN format is 'arn:aws:rds:region:account:secgrp:security-group-name'. So the ARN in the policy is correct? The issue might be that the security group does not exist or is in a different region. However, the most common mistake is that the user also needs permission to 'rds:DescribeDBSecurityGroups' to view the security group. Option A is a valid explanation. Option B is wrong because the policy does allow the action on that resource. Option C is wrong because the policy allows the action. Option D is wrong because the user can create security groups.
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.
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?
Static NAT maps one inside address to one outside address.
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