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Beginner

Questions about GRE an VPN

Hi, 

I have different questions about tunnels management. 

 

1) Imagine that you have 2 router (A,B) with a GRE Tunnel, but inside you have also 2 different routers o firewall with a vpn connection (image1 attached).  Which would be the normal behavior?  First GRE tunnel begin the communication about physical interface and inside this GRE tunnel exist a vpn connection?

 

2) I think I could be a ping from physical interface (out GRE and vpn), ping about GRE and ping about vpn, It's correct?

 

3) Which ports / protocols use GRE or VPN connections? Would be possible to permit / deny using acl's or a different resource? Would be possible to control these connections?

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