1. for configuration sync between WSA's use SMA . SMA can manage WSA and collect reporting data  from both WSA 2.when WCCP used and  When a WCCP client fails, the portion of the load handled by that client is automatically redistributed to the remain...

following are the list of probes supported by ISE     NetFlow Probe    DHCP Probe    DHCP SPAN Probe    HTTP Probe    HTTP SPAN Probe    RADIUS Probe    Network Scan Probe    DNS Probe    SNMP Query Probe    SNMP Trap Probe let me know the profiling...

WSA is sized based on RPM (request per minute) let me know the number users, license bundle that you will enable

make sure you have enabled AMP file Analysis and selected all file types for file analysis

to load balancing you use  DNS MX or A records by having equal weight  hosts