Quick Answer
The correct choice is the combination of Microsoft.IdentityModel.Tokens and System.IdentityModel.Tokens.Jwt, as these are the standard .NET libraries specifically designed for JWT token validation. These libraries handle the core validation tasks—verifying the token’s cryptographic signature using the signing keys from Azure AD, checking the issuer claim against your tenant, and confirming the audience matches your API’s application ID—all without requiring external HTTP calls. On the AZ-204 exam, this question tests your understanding of the token validation pipeline, often appearing in scenarios where you must secure a custom API. A common trap is confusing MSAL (which acquires tokens, not validates them) or ASP.NET Core Identity (which manages local users) with the validation libraries. Remember: MSAL gets the ticket, IdentityModel validates it. A useful memory tip is to think of “Token Validation Twins”—Microsoft.IdentityModel.Tokens for the validation logic and System.IdentityModel.Tokens.Jwt for parsing the JWT itself.
This AZ-204 practice question tests your understanding of implement azure 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.
Your API is secured using Azure AD (now Microsoft Entra ID) tokens. You need to validate the token in your custom code. Which library should you use to validate the token's signature, issuer, and audience?
ASP.NET Core Identity
Why wrong: ASP.NET Core Identity is for local user authentication.
Microsoft Graph SDK
Why wrong: Graph SDK is for calling Microsoft Graph APIs.
Microsoft Authentication Library (MSAL)
Why wrong: MSAL is for acquiring tokens, not validating them.
Microsoft.IdentityModel.Tokens and System.IdentityModel.Tokens.Jwt
These libraries provide token validation methods.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Microsoft.IdentityModel.Tokens and System.IdentityModel.Tokens.Jwt
Microsoft.IdentityModel.Tokens and System.IdentityModel.Tokens.Jwt are the standard .NET libraries for JWT token validation. Option A is correct. Option B is wrong because MSAL is for acquiring tokens, not validation. Option C is wrong because Graph API is for accessing Microsoft Graph. Option D is wrong because ASP.NET Core Identity is for user management.
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
For each option: why learners choose it and why it is or isn't the right answer here.
ASP.NET Core Identity
Why it's wrong here
ASP.NET Core Identity is for local user authentication.
Microsoft Graph SDK
Why it's wrong here
Graph SDK is for calling Microsoft Graph APIs.
Microsoft Authentication Library (MSAL)
Why it's wrong here
MSAL is for acquiring tokens, not validating them.
Microsoft.IdentityModel.Tokens and System.IdentityModel.Tokens.Jwt
Why this is correct
These libraries provide token validation methods.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
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
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.
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
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 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 AZ-204 NAT questions on configuration and troubleshooting.
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FAQ
Implement Azure security — This question tests Implement Azure security — Static NAT maps one inside address to one outside address..
The correct answer is: Microsoft.IdentityModel.Tokens and System.IdentityModel.Tokens.Jwt — Microsoft.IdentityModel.Tokens and System.IdentityModel.Tokens.Jwt are the standard .NET libraries for JWT token validation. Option A is correct. Option B is wrong because MSAL is for acquiring tokens, not validation. Option C is wrong because Graph API is for accessing Microsoft Graph. Option D is wrong because ASP.NET Core Identity is for user management.
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 AZ-204 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft 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 AZ-204 exam.
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