a quick answer would be, it depends on your deployment.
If users in remote offices need a radius server to authenticate to (if you use EAP/802.1x, i.e. WPA/WPA2 Enterprise) then you either need to make the traffic go to the controller OR install radius server in every remote office. If you use something like WPA-PSK then APs can work fine if the connection to the controller lost.
This was a quick answer.
For more detailed answer I think you need to go to read the HREAP deployment guide. You'll find answers to most of your questions.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
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I have created a Powershell script to automatically add a Wireless Guest
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(Install-Module -Name SNMP) SNMP Write Access to y...