An engineer must ensure that the wireless network can accomplish fast secure roaming by way of caching keys on the access points. Which key caching mechanism is enabled by default on a Cisco AireOS WLC?
A. SKC
B. OKC
C. 802.11r
D. CCKM
Which key caching mechanism is enabled by default on a Cisco AireOS WLC?
OKC is enabled by default, so the answer is B
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
Answer is under the CLI procedure step 2.