ISC Infrastructure And System Security Practice Question
When designing a secure API, which protocol is recommended for authorization?
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
✓
OAuth 2.0.
OAuth 2.0 is the industry-standard authorization framework for enabling third-party applications to obtain limited access to an HTTP service.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RADIUS.
Why it's wrong here
RADIUS is typically used for network access control.
- ✗
SAML 2.0.
Why it's wrong here
SAML is primarily for authentication, not API authorization.
- ✓
OAuth 2.0.
Why this is correct
OAuth 2.0 is designed specifically for API authorization delegation.
- ✗
LDAP.
Why it's wrong here
LDAP is a directory service protocol, not an API authorization protocol.
About these practice questions
This ISC question is part of Courseiva's 208-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.