A. This indicates a security issue. The client with a MAC address ending with 37 18;0d Is performing a Denial-of-Service attack on your network. You should track down the client and remove it from the network.
B. This is normal, expected behavior. No further actions are needed.
C. This indicates a client WLAN driver issue for the client with a MAC address ending with 37:18 :Od. You should upgrade the client WLAN driver.
D. There is a roaming issue Enable Fast Roaming 802.11r and OKC to resolve the issue.
Explanation:
The event log showing PMK (Pairwise Master Key) and OKC (Opportunistic Key Caching) key add/update and delete operations is indicative of normal client behavior in a WLAN environment. These events are part of the standard process for maintaining client session security and do not necessarily indicate any issue.