Refer to the exhibits.


Examine the network diagram and packet capture shown in the exhibit.
During packet capture analysis, a RADIUS Access-Request packet was detected being sent from FortiSwitch to FortiAuthenticator and passing through FortiGate. The capture shows that the User-Name attribute in the RADIUS Access-Request packet contains the client MAC address.
Why is the client MAC address contained in the User-Name attribute of the RADIUS Access-Request packet?