Clustering Cisco WLCs into a single RF group enables the RRM algorithms to scale beyond the capabilities of a single Cisco WLC.
How many WLC and APs in an RF group can the controller software scale up to in WLC release
8.9 depending on the platform?

An enterprise is using the wireless network as the main network connection for corporate users and guests. To ensure wireless network availability, two standalone controllers are installed in the head office APs are connected to the controllers using a round-robin approach to load balance the traffic. After a power cut, the wireless clients disconnect while roaming. An engineer tried to ping from the controller but fails.
Which protocol needs to be allowed between the networks that the controllers are Installed?

An engineer is upgrading the legacy APs to 802.11ac Wave 2 capable APs. The existing gigabit uplinked switches provide 802.3at. Which switch limitation is a concern?

During a post deployment site survey, issues are found with non-Wi-Fi interference.
What should the engineer use to identify the source of the interference?

During a client roaming event, which device is responsible for communicating the new Layer 2 EID mapping of a wireless supplicant to the fabric domain?