An engineer must ensure that the wireless network accomplishes fast, secure roaming by way of caching keys on the APs. Which key caching mechanism is enabled by default on a Cisco AireOS WLC?
By default, SKC is disabled and opportunistic key caching (OKC) is enabled.
https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_01010010.html
While 802.11r and CCKM are both key components of fast roaming solutions, the question specifically focuses on caching mechanisms. In this case, only SKC (Sticky Key Caching) and OKC (Opportunistic Key Caching) are relevant. It's important to note that SKC is optional, not widely supported, and does not function across inter-controller roams, which limits its effectiveness. Given these limitations, OKC is the correct choice for fast roaming in most environments.
Right choice is OKC, read this link for more details : https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/116493-technote-technology-00.html
Answer is B
OKC is a fast roaming technique supported by Microsoft and some Android clients. Another fast roaming method is the use of 802.11r, which is supported by Apple and few Andorid clients. OKC is enabled by default on a WLAN. This configuration enables the control of OKC on a WLAN. Disabling OKC on a WLAN disables the OKC even for the OKC-supported clients.
A new configuration is introduced for each WLAN in the controller in Cisco IOS XE Amsterdam 17.2.1, to disable or enable fast and secure roaming with OKC at the corresponding AP.
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