Clustering Pre-reqs for sql 2012 always on availability group

Hello,
I'm currently in the planning stages of building a sql 2012 alwaysON cluster on Windows server 2012. I'm a bit confused with some of the requirements.
Does  windows 2012 clustering require a heartbeat network as well a nic that communicates with the domain?
For a 2 node 2012 always on sql cluster which type of cluster should I use? node majority? node majority plus fileshare?
thanks!

I found this information regarding SQL 2014. This could be helpful
"We strongly recommend that you use the same network links for communications between WSFC cluster members and communications
between availability replicas. Using separate network links can cause unexpected behaviors if some of links fail (even intermittently).
For example, for an availability group to support automatic failover, the secondary replica that is the automatic-failover partner must be in the SYNCHRONIZED state. If the network link to this secondary replica fails (even intermittently), the replica enters
the UNSYNCHRONIZED state and cannot begin to resynchronize until the link is restored. If the WSFC cluster requests an automatic failover while the secondary replica is unsynchronized, automatic failover will not occur."
source:http://msdn.microsoft.com/en-us/library/ff878487.aspx#NetworkConnect

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