Quick Answer
The answer is SAML-based federated authentication because it is the only AWS Client VPN authentication method that directly integrates with an external identity provider like Active Directory to enforce user-level access control. When a user connects, AWS Client VPN redirects them to the corporate AD via a SAML 2.0 handshake, where credentials are verified before the VPN session is established. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of how authentication methods map to specific use cases—a common trap is confusing certificate-based or mutual authentication with user directory integration, since those rely on device certificates rather than individual AD accounts. IAM authorization is also a distractor, as it governs API calls, not VPN tunnels. For the exam, remember the key distinction: if the scenario mentions “Active Directory users” or “corporate credentials,” your mind should immediately jump to SAML federation. A useful memory tip is “SAML = SAMe Login” as in the same credentials users already have in AD.
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 AWS Client VPN to provide remote access to their VPC. They want to ensure that only authenticated users from their corporate Active Directory can access the VPN. Which authentication method should they use?
IAM authorization
Why wrong: IAM is for AWS service authorization, not VPN authentication.
SAML-based federated authentication
SAML allows integration with Active Directory for user authentication.
Certificate-based authentication using AWS Certificate Manager
Why wrong: Certificates authenticate devices, not users.
Mutual authentication
Why wrong: Mutual authentication uses certificates on both sides, not Active Directory.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SAML-based federated authentication
Option C is correct because AWS Client VPN supports SAML-based federated authentication with Active Directory. Option A is wrong because certificate-based authentication does not tie to Active Directory users. Option B is wrong because mutual authentication still uses certificates. Option D is wrong because IAM authorization is for AWS API access, not VPN authentication.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
IAM authorization
Why it's wrong here
IAM is for AWS service authorization, not VPN authentication.
SAML-based federated authentication
Why this is correct
SAML allows integration with Active Directory for user authentication.
Related concept
Authentication checks who the user is.
Certificate-based authentication using AWS Certificate Manager
Why it's wrong here
Certificates authenticate devices, not users.
Mutual authentication
Why it's wrong here
Mutual authentication uses certificates on both sides, not Active Directory.
Common exam traps
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
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.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
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
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related ANS-C01 questions on access control and AAA configuration.
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FAQ
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Authentication checks who the user is..
The correct answer is: SAML-based federated authentication — Option C is correct because AWS Client VPN supports SAML-based federated authentication with Active Directory. Option A is wrong because certificate-based authentication does not tie to Active Directory users. Option B is wrong because mutual authentication still uses certificates. Option D is wrong because IAM authorization is for AWS API access, not VPN authentication.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related ANS-C01 questions on access control and AAA configuration.
Authentication checks who the user is.
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Last reviewed: Jun 20, 2026
This ANS-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 ANS-C01 exam.
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