number of network cards required for ADFS proxy with NLB config

Hi,

The design is, there are two physical ADFS proxies going to be placed in the perimeter n/w. NLB is going to be implemented for clustering of IP's. 

My question is how many network cards are required for each ADFS proxies?

As per my understanding: one for NLB itself, one for internal communication to domain and one for external communication. Correct me if I'm wrong.

One more thing which i know is NLB itself requires two n/w cards, one for NLB itself and another one to communication between ADFX proxies. 

I'm not sure with the above network requirements. So is this configuration correct? If not kindly provide the correct network card requirements. 

And is there a way to reduce number of cards?

Thanks,

Arun