GuestPass login procedure ?

philip_francis1

Hello, can someone please advise how the guest pass splash screen system works in detail. Is my understanding below correct ?

1. the client joins with the access point GuestPass SSID via wifi at layer 2. 
2. The access point allows the client to receive a DHCP address from the guestPass VLAN. 
3. The access point requests the GuestPass login splash screen HTTPS page from the Zonedirector using the access point's source IP and proxies it through to the client ?
...or does the client directly request the guestpass login splash screen from the ZoneDirector  using the client's source IP address?
4. The Zonedirector authorises the GuestPass login credentials and tells the access point to allow traffic from the client

Thank you kindly.