Which of the following is a technique that enhances wireless network security by preventing users from logging on to the WLAN from a specified physical location?

A.
RBAC

B.
WPA

C.
LBAC

D.
WLAN controller

Explanation:
Location-based access control (LBAC) is defined as location-aware security. This technique helps in preventing users from logging on to the WLAN from a specified physical location, thus enhancing wireless network security. It takes a mobile user’s current location in order to decide whether to allow or deny users from accessing a particular resource. Answer option B is incorrect. Wi-Fi Protected Access (WPA and WPA2) is a certification program developed by the Wi-Fi Alliance to indicate compliance with the security protocol created by the Wi- Fi Alliance to secure wireless computer networks. The Alliance defined the protocol in response to several serious weaknesses researchers had found in the previous system, WEP. The WPA protocol implements the majority of the IEEE 802.11i standard. The Wi-Fi Alliance intended WPA as an intermediate measure to take the place of WEP pending the preparation of 802.11i. Specifically, the Temporal Key Integrity Protocol, was brought into WPA. Answer option A is incorrect. Role-based access control (RBAC) is an approach to restricting system access to authorized users. It is a newer alternative approach to mandatory access control (MAC) and discretionary access control (DAC). RBAC is sometimes referred to as role-based security. RBAC is a policy neutral and flexible access control technology sufficiently powerful to simulate DAC and MAC. Conversely, MAC can simulate RBAC if the role graph is restricted to a tree rather than a partially ordered set.
Answer option D is incorrect. A wireless LAN controller is a device that is used in combination with Lightweight Access Point Protocol (LWAPP) to manage light weight access points in large quantities by the network administrator or NOC. The Wireless LAN controller is part of the Data Plane within the Cisco Wireless Model. The WLAN controller automatically handles the configuration of anywhere from 6 to 300 wireless access-points, depending on the model.