Hello @fatalXerror
1. Which is better, I deploy a FlexConnect AP in my remote office and associate it to my central office or provide a another WLC dedicated for remote office.
The reason people deploy flexconnect on remote office is not because it is better or worst, it is because it is cheaper and not only because you save with the WLC. By installing APs in flexconnect you dont need to bring all the wireless traffic to the Data Center. If you use a MPLS network for example, you can save with links cost by bringing to Data Center only the necessary traffic.
Now a days where Microsoft tools is available through the internet, just a few traffic would be sent to the Data Center.
2. I have a remote office which I plan to deploy with FlexConnect AP with central authentication to ISE (located at my central office) then once authenticated and authorized by ISE, all traffic will be locally switched at my remote branch. This is for my internal and guest use-cases.
That´s the idea of Flexconnect.
3. How many users can connect per FlexConnect Group?
The relationship is AP per flexconnect group and not user per flexconnect group. A maximum of 100 APs is supported per FlexConnect group (other than the default FlexConnect group, which is limited only by the maximum APs supported by the controller).
4. My WLC will be at my central office, should I set my APs in my central office to be FlexConnect APs and associate it to a FlexConnect Group also like my plan in my remote office?
It does not matter. The idea of Flexconnect or not must rely on where you need the wireless traffic to be: Local on the access switch or on the Data Center with the WLC.
5. Which is better, guest separated only by VLAN or redirecting guest traffic to anchor WLC?
For security perspective anchor in the DMZ would be a better solution but it will always depend on the budget.
