Activesync

I will take it that you have either APM standalone or EDGE gateway, the limitation is only there isn't any load balancing or persistence w/o LTM.

 

As long as the limitation is not a concern as you using other technology for availability.

 

But it still fulfill the authentication checks and pass on to the CAS.

 

Chapter 2 did have a flow on that but you can assumed the SSL bridging since there is no LTM, it go direct to CAS.