Network Concept and Configuration for Scale-out and System Replication

Hello experts,

I get the following picture from white book SAP HANA Network Requirement.

I have some confuse which needs your confirmation:

Q1: For above HANA landscape, every host need at least three network cards as recommended, right? one for public, one for scale-out internal and one for system replication?

Q2: For system replication network, we do not need to add 10.5.x.x to /etc/hosts of these systems?

Q3: Virtual IP means public IP in this pic, right?

Thanks & Best Regards,

Tong Ning