Fortinet Exam NSE8_812 Topic 1 Question 25 Discussion

Bis correct because the OCSP check of the certificate can be combined with a certificate revocation list (CRL). This means that the FortiGate will check the OCSP server to see if the certificate has been revoked, and it will also check the CRL to see if the certificate has been revoked.

Dis correct because if the OCSP server is unreachable, authentication will succeed if the certificate matches the CA. This is because the FortiGate will fall back to using the CRL if the OCSP server is unreachable.

The other options are incorrect. Option A is incorrect because OCSP checks can go to other OCSP servers, not just the FortiAuthenticator. Option C is incorrect because OCSP certificate responses can be cached by the FortiGate.

References:

Configuring SSL VPN authentication using digital certificates | FortiGate / FortiOS 7.2.0 - Fortinet Document Library

Online Certificate Status Protocol (OCSP) | FortiGate / FortiOS 7.2.0 - Fortinet Document Library

Certificate Revocation Lists (CRLs) | FortiGate / FortiOS 7.2.0 - Fortinet Document Library