A client is connecting to 802.

According to the Aruba Documentation Portal 1 , 802.1X is a standard for port-based network access control that uses a RADIUS server to authenticate and authorize wireless clients. 802.1X can be configured in different modes, such as bridge mode, tunnel mode, or split tunnel mode.

Option C: GRE tunnel

This is because option C shows how to configure an SSID in tunnel mode with the default AP-group settings on an Aruba switch.  In tunnel mode, all client traffic from the access points is tunneled back to the controller and the controller would in turn put the client traffic onto the network 2 .  The GRE protocol is used to encapsulate and decapsulate the traffic between the access points and the controller 3 .

Therefore, option C is correct.

1 : https://www.arubanetworks.com/techdocs/AOS-CX/10.06/HTML/5200-7696/GUID-581D2976-694B-46C7-8497-F6B788AA05B2.html  2 : https://community.arubanetworks.com/discussion/bridge-and-tunnel-mode  3 : https://www.twingate.com/blog/ipsec-tunnel-mode