CISSP Security Architecture and Engineering Practice Question
In a PKI hierarchy, a relying party needs to verify a certificate's validity. To reduce latency and improve privacy, which mechanism allows the relying party to obtain the revocation status without contacting the CA directly for each verification?
⚠ Common exam trap
CISSP often tests the confusion between OCSP stapling (server-provided, privacy-preserving, low-latency) and traditional OCSP/CRL (client-initiated, privacy-leaking, higher-latency), so candidates who only remember 'OCSP' without the 'stapling' qualifier pick the wrong mechanism.
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
✓
OCSP stapling
OCSP stapling allows the certificate holder (web server) to periodically query the CA's OCSP responder and cache a signed, time-stamped OCSP response, which it then 'staples' to the TLS handshake. The relying party receives the revocation status directly from the server during the handshake, eliminating a separate round-trip to the CA and hiding the client's browsing activity from the CA. This reduces latency and improves privacy compared to traditional OCSP or CRL retrieval.
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 Transparency (CT) logs
Why it's wrong here
Certificate Transparency (CT) logs are public, append-only logs that record all newly issued SSL/TLS certificates. Their primary purpose is to allow domain owners and the public to monitor certificates issued for their domains, helping to detect mis-issuances by Certificate Authorities (CAs). While CT logs provide an audit trail of certificate issuance, they do not offer a mechanism for a relying party to check the real-time revocation status of an already issued certificate.
- ✗
Certificate pinning
Why it's wrong here
Certificate pinning is a security mechanism where a client pre-associates a specific cryptographic public key or certificate with a particular web service or host. This hardcoded association helps prevent Man-in-the-Middle (MITM) attacks by ensuring that only the expected certificate or key is accepted, even if a compromised CA issues a fraudulent certificate. However, pinning does not provide a method for a relying party to dynamically verify the current revocation status of a certificate during a transaction; it's a static trust anchor.
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Certificate Revocation List (CRL)
Why it's wrong here
A Certificate Revocation List (CRL) is a digitally signed list issued periodically by a Certificate Authority (CA) that contains the serial numbers of certificates that have been revoked before their scheduled expiration date. Relying parties must download and process this potentially large list to check if a certificate is present, which can be inefficient due to file size, network latency, and the delay between CRL publication cycles. This method does not offer real-time revocation status and can introduce significant performance overhead.
- ✓
OCSP stapling
Why this is correct
OCSP stapling, formally known as the TLS Certificate Status Request extension, allows the web server itself to query the Certificate Authority's (CA) Online Certificate Status Protocol (OCSP) responder for the revocation status of its own certificate. The server then caches this signed OCSP response and "staples" it to the TLS handshake, sending it directly to the client. This method significantly improves performance by eliminating the need for each client to contact the OCSP responder directly and enhances privacy by preventing the OCSP responder from tracking client requests.
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Incident Response and Business Continuity
Key term
TLS
Transport Layer Security (TLS) is a cryptographic protocol that encrypts data sent over the internet to keep it private and ensure it hasn’t been tampered with.
Key term
Privacy
Privacy in IT is the control over how personal data is collected, stored, used, and shared by systems and organizations.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official ISC2 exam blueprint
This CISSP 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 CISSP exam.