CAS-004 Security Engineering Practice Question
An organization is deploying a new PKI and wants to ensure certificate revocation is performed efficiently. Which THREE methods should be implemented? (Select THREE.)
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)
CRL, OCSP, and OCSP stapling are all standard revocation checking mechanisms; OCSP stapling improves performance by having the server present the OCSP response.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Short-lived certificates
Why it's wrong here
Short-lived certs reduce need for revocation but are not a revocation method.
- ✓
Online Certificate Status Protocol (OCSP)
Why this is correct
OCSP provides real-time status.
- ✓
OCSP stapling
Why this is correct
Stapling improves efficiency by having the server provide the OCSP response.
- ✗
Certificate transparency logs
Why it's wrong here
CT logs are for logging certificate issuance, not revocation.
- ✓
Certificate revocation lists (CRLs)
Why this is correct
CRLs are a traditional revocation method.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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