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Why does kolla deployment need two NICs?

I can't find much documentation explaining this and I am very new to using kolla. The quick start guide for setting up a deployment says each node needs two NICs.

I have three servers, a deploy host, a controller node, and a compute node. I am using kolla-ansible to do a simple multinode deployment on the controller node and compute node and I am wondering why each node needs two NICs?

What exactly does each NIC get used for during the deployment?