CAS-004 Security Engineering Practice Question
During a PKI migration, the security team discovers that some internal clients do not support OCSP stapling but require online certificate status checking. Which alternative should be configured to minimize latency and ensure validity?
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
✓
Use a local OCSP responder to handle revocation checks within the internal network.
OCSP stapling is not supported; traditional OCSP requests add latency. A locally hosted OCSP responder reduces network round trips compared to relying on external CAs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to self-signed certificates to avoid revocation checking altogether.
Why it's wrong here
Self-signed certificates do not solve revocation and introduce trust issues.
- ✗
Configure clients to use CRLDP with a local CRL distribution point.
Why it's wrong here
CRLs can be large and cause latency; also not real-time. OCSP is preferred for up-to-date status.
- ✓
Use a local OCSP responder to handle revocation checks within the internal network.
Why this is correct
A local OCSP responder reduces latency and provides timely revocation status.
- ✗
Disable CRL checking and rely on certificate expiration only.
Why it's wrong here
This ignores revocation, creating a security risk.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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