Explanation/Reference:
Explanation: Cisco Centralized Key Management (CCKM) is the first fast-secure roaming method developed and implemented on enterprise WLANs, created by Cisco as the solution used in order to mitigate the delays explained thus far, when 802.1X/EAP security is used on the WLAN. As this is a Cisco proprietary protocol, it is only supported by Cisco WLAN infrastructure devices and wireless clients (from multiple vendors) that are Cisco Compatible Extension (CCX)-compatible for CCKM.
CCKM can be implemented with all of the different encryption methods available for WLANs, to include:
WEP, TKIP, and AES. It is also supported with most of the 802.1X/EAP authentication methods used for WLANs, dependent upon the CCX version supported by the devices.
Reference: http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/116493- technote-technology-00.html#anc8