Refer to the exhibit.

According to theFortiSwitchOS 7.6 Administration Guideand theFortiSwitch 7.6 Study Guide, 802.1X port security allows administrators to define specific actions based on the outcome of an authentication attempt. The configuration exhibit shows a security policy named " Students " with two specialized VLAN assignments enabled: aGuest VLANand anAuthentication fail VLAN.

In FortiSwitchOS 7.6, these two settings serve distinct purposes based on the client ' s behavior:

Guest VLAN (Option C):This is used when a connected device doesnothave an 802.1X supplicant (software) or does not respond to EAP (Extensible Authentication Protocol) requests within the specified " Guest authentication delay " . In this scenario, the device is moved to the " onboarding " VLAN to allow for basic network access or software downloads.

Authentication fail VLAN (Option A):This is triggered specifically when a devicedoesattempt to authenticate via 802.1X but the authentication server (RADIUS) returns anAccess-Rejectmessage, typically due toincorrect credentials.

As stated in the scenario, the userattemptsto authenticate but enters thewrong credentials. According to the policy shown in the exhibit, theAuthentication fail VLANis enabled and set to " quarantine.fortilink (quarantine) " . Therefore, the FortiSwitch will logically move the port ' s traffic into the quarantine VLAN, isolating the user from the production network due to the failed login attempt. Option B is incorrect as there is no " shutdown " action configured, and Option D refers to a default state that is overridden by the explicit failure policy.