Which technique is used by Cisco WLCs to minimize the time required on key exchanges during roaming by using an amendment to WLAN standards to address fast roaming or fast BSS transition?

Which technique is used by Cisco WLCs to minimize the time required on key exchanges during roaming by using an amendment to WLAN standards to address fast roaming or fast BSS transition?

• key caching
• 802.11r support
• intercontroller roaming
• Cisco Centralized Key Management (CCKM)

Explanation: Cisco controllers offer three techniques to minimize the time and effort spent on key exchanges during roams:

• Cisco Centralized Key Management (CCKM): One controller maintains a database of clients and keys on behalf of bound APs and provides them to other controllers and bound APs as needed during client roams.
• Key caching: Each client maintains a list of keys used with prior AP associations and presents the keys as it roams.
• 802.11r: This 802.11 amendment addresses fast roaming or fast BSS transition. A client can cache a portion of the key of the authentication server and present that to future APs as it roams.

Exam with this question: Quiz - Understanding Wireless Roaming and Location Services