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SSCP Practice Question: A cloud application uses OAuth 2.0 to authorize a…
A cloud application uses OAuth 2.0 to authorize a third-party app to access user data. What is the primary purpose of the access token issued by the authorization server?
⚠ Common exam trap
Many exam-takers confuse authentication with authorization, mistakenly believing the access token authenticates the user to the resource server, when in fact it only authorizes the client to access resources on behalf of the user.
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
✓
To grant the client application limited access to user's resources
In OAuth 2.0, the access token is a credential that represents the authorization granted to the client application by the resource owner. Its primary purpose is to allow the client to access specific, scoped resources on the resource server on behalf of the user, without exposing the user's credentials. This is defined in RFC 6749, where the token encapsulates the granted permissions and scope.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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To revoke the user's access to the client application
Why it's wrong here
Revocation is performed at the authorization server's token revocation endpoint, not by the access token itself; the token is a credential granting scoped access. Revocation is the correct mechanism when a user withdraws consent or a client is compromised and issued tokens must be invalidated before expiry.
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To encrypt data exchanged between client and resource server
Why it's wrong here
Access tokens convey authorisation grants, not confidentiality; encryption of client-to-resource-server traffic is provided by TLS, independent of the token. Encryption is the right control when data in transit must be protected from interception, whereas the token only proves the grant.
- ✓
To grant the client application limited access to user's resources
Why this is correct
The access token is a credential the client presents to the resource server, conveying delegated authorisation for a defined scope and duration. It lets the third-party app reach specific user resources without exposing the user's credentials.
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To authenticate the user to the resource server
Why it's wrong here
An access token authorises the client to call the resource server on the user's behalf; it does not authenticate the user, whose identity is established during the earlier authentication step. User authentication is the purpose of the ID token, issued alongside the access token in OpenID Connect flows.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.