Which technique is used by Cisco WLCs to minimize the time required on key exchanges during roaming by maintaining a database of clients and keys on behalf of bound APs, and providing those clients and keys to other controllers and bound APs as needed during roaming?

  • key caching
  • 802.11r support
  • intercontroller roaming
  • Cisco Centralized Key Management (CCKM)
Explanation & Hint:

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 the clients and keys 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.

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CCNPv8 ENCOR (Version 8.0) – Chapters 17 – 19: Wireless Essentials Exam Answers Full 100%