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Why were the APs unable to rejoin the Cisco WLC, and how can you prevent this from happening in the future?

After a scheduled downtime of your 5508 WLC, you notice that only a handful of the 100 APs are
rejoining the controller. All the APs are in the same subnet and use default settings. Cisco WLC
debugs indicate that the APs are sending discovery and join requests. Only after shutting down all
the switch ports that connect to the APs and turning five ports back on at a time can you rejoin all
the APs. Why were the APs unable to rejoin the Cisco WLC, and how can you prevent this from
happening in the future?

What is the best way to filter multicast traffic going toward wireless clients?

Corporation XYZ is enabling multicast on its WLANs in order to enable company meetings to be
streamed to employee laptops. The company wishes to block specific unwanted multicast traffic
from traversing the wireless network. What is the best way to filter multicast traffic going toward
wireless clients?