Free Fortinet NSE6_FAC-6.4 Exam Actual Questions & Explanations

Last updated on: Jun 2, 2026

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Question No. 1

A device or user identity cannot be established transparently, such as with non-domain BYOD devices, and allow users to create their own credentialis.

In this case, which user idendity discovery method can Fortiauthenticator use?

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Correct Answer: D

Portal authentication is a user identity discovery method that can be used when a device or user identity cannot be established transparently, such as with non-domain BYOD devices, and allow users to create their own credentials. Portal authentication requires users to enter their credentials on a web page before accessing network resources. The other methods are used for transparent identification of domain devices or users. Reference: https://docs.fortinet.com/document/fortiauthenticator/6.4/administration-guide/372406/user-identity-discovery


Question No. 2

You are a FortiAuthenticator administrator for a large organization. Users who are configured to use FortiToken 200 for two-factor authentication can no longer authenticate. You have verified that only the users with two-factor authentication are experiencing the issue.

What can cause this issue?

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Correct Answer: C

One possible cause of the issue is time drift between FortiAuthenticator and hardware tokens. Time drift occurs when the internal clocks of FortiAuthenticator and hardware tokens are not synchronized. This can result in mismatched one-time passwords (OTPs) generated by the hardware tokens and expected by FortiAuthenticator. To prevent this issue, FortiAuthenticator provides a time drift tolerance option that allows a certain number of seconds of difference between the clocks.


Question No. 3

When configuring syslog SSO, which three actions must you take, in addition to enabling the syslog SSO method? (Choose three.)

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Correct Answer: B, C, E

To configure syslog SSO, three actions must be taken, in addition to enabling the syslog SSO method:

Define a syslog source, which is a device that sends syslog messages to FortiAuthenticator containing user logon or logoff information.

Select a syslog rule for message parsing, which is a predefined or custom rule that defines how to extract the user name, IP address, and logon or logoff action from the syslog message.

Set the syslog UDP port on FortiAuthenticator, which is the port number that FortiAuthenticator listens on for incoming syslog messages.


Question No. 4

You have implemented two-factor authentication to enhance security to sensitive enterprise systems.

How could you bypass the need for two-factor authentication for users accessing form specific secured networks?

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Correct Answer: C

Adaptive Authentication is a feature that allows administrators to bypass the need for two-factor authentication for users accessing from specific secured networks. Adaptive Authentication uses geolocation information from IP addresses to determine whether a user is accessing from a trusted network or not. If the user is accessing from a trusted network, FortiAuthenticator can skip the second factor of authentication and grant access based on the first factor only.


Question No. 5

Which behaviors exist for certificate revocation lists (CRLs) on FortiAuthenticator? (Choose two)

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Correct Answer: A, B

CRLs are lists of certificates that have been revoked by the issuing CA and should not be trusted by any entity. CRLs contain the serial number of the certificate that has been revoked, the date and time of revocation, and the reason for revocation. Revoked certificates are automatically placed on the CRL by the CA and the CRL is updated periodically. CRLs can be exported through various methods, such as HTTP, LDAP, or SCEP. Each local CA has its own CRL that is specific to its issued certificates. Reference: https://docs.fortinet.com/document/fortiauthenticator/6.4/administration-guide/372408/certificate-management/372413/certificate-revocation-lists