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Refer to the exhibit. An engineer is about to establish a mobility peer connection between a Cisco Catalyst 9800-CL version 16.10.1e and Cisco AireOS 5520 version 8.8.120.0. The data path between the 9800-CL and AireOS 5520 is down, but its control path is up. Based on the configuration, what is the cause of the issue?

support high client concentration

optimize client performance

avoid interference

Which approach should be taken?

protocol must the engineer enable on the WLC so that the number of packets that are exchanged between an

access point and client are reduced and fast roaming occurs?

An engineer must configure the virtual IP address on multiple controllers in a mobility group. Which rule must the engineer follow to ensure proper roaming?

An engineer must speed up the reauthentication delays that are being experienced on the wireless

infrastructure by deploying a key-caching mechanism. Which mechanism must be configured?