The correct answer is to use IAM policies to grant permissions to the DynamoDB table. This works because DynamoDB is fully integrated with AWS IAM for both authentication and authorization, meaning the developer can attach an IAM policy to a user, group, or role that specifies exactly which DynamoDB actions (like GetItem or PutItem) are allowed on the target table, and the service will verify the caller’s identity and permissions before processing any request. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of how DynamoDB’s native IAM integration differs from other access control methods—a common trap is confusing Cognito (which handles user sign-in, not direct table access) or VPC endpoints (which provide network isolation but no identity-based control) with IAM. Remember that DynamoDB does not support resource-based policies like S3 bucket policies, so all fine-grained access must be managed through identity-based IAM policies. A helpful memory tip: “IAM for Identity, Cognito for Credentials, VPC for Connectivity.”
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. 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.
A company is using Amazon DynamoDB to store user session data. The security team requires that all access to the table be authenticated and authorized using AWS IAM. Which mechanism should the developer use to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use IAM policies to grant permissions to the DynamoDB table.
Option A is correct because DynamoDB is integrated with IAM for authentication and authorization. Option B is wrong because Cognito is for user authentication, not for direct DynamoDB access. Option C is wrong because VPC endpoints provide network isolation but not authentication. Option D is wrong because resource-based policies are not supported for DynamoDB tables.
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.
✗
Create a VPC endpoint for DynamoDB and allow only traffic from the VPC.
Why it's wrong here
Network isolation does not provide authentication.
✗
Use Amazon Cognito identity pools to grant access to the DynamoDB table.
Why it's wrong here
Cognito is for user authentication; still uses IAM roles behind the scenes but not direct.
✓
Use IAM policies to grant permissions to the DynamoDB table.
Why this is correct
IAM is the native authentication/authorization for DynamoDB.
Related concept
Authentication checks who the user is.
✗
Use a DynamoDB resource-based policy to restrict access.
Why it's wrong here
DynamoDB does not support resource-based policies.
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 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 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.
Database Security — This question tests Database Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Use IAM policies to grant permissions to the DynamoDB table. — Option A is correct because DynamoDB is integrated with IAM for authentication and authorization. Option B is wrong because Cognito is for user authentication, not for direct DynamoDB access. Option C is wrong because VPC endpoints provide network isolation but not authentication. Option D is wrong because resource-based policies are not supported for DynamoDB tables.
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.
What is the key concept behind this question?
Authentication checks who the user is.
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