CAS-004 Security Engineering Practice Question
An organization is implementing a PKI and wants to ensure that clients can quickly check if a certificate has been revoked without downloading a large list. Which protocol should be used?
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
✓
Online Certificate Status Protocol (OCSP)
OCSP (Online Certificate Status Protocol) allows clients to check the revocation status of a single certificate in real time without downloading a full CRL.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Certificate Revocation List (CRL)
Why it's wrong here
CRL requires downloading a potentially large list.
- ✓
Online Certificate Status Protocol (OCSP)
Why this is correct
OCSP provides real-time revocation status checks.
- ✗
Certificate Transparency (CT)
Why it's wrong here
CT is for logging certificates, not revocation status.
- ✗
Simple Certificate Enrollment Protocol (SCEP)
Why it's wrong here
SCEP is for certificate enrollment, not revocation.
Go deeper
Related to this question
About these practice questions
One of 968 original CAS-005 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.