As you can see, my two Windows Server Failover Cluster (WSFC) nodes have three network interfaces each, which connects them to three different networks :

1. A public network
2. A private network consisting of the WSFC nodes
3. A private network consisting of the WSFC nodes and a machine with the WSFC Quorum Witness File Share

Does this network configuration I've planned, make sense? Do I have the "right" number of NICs and networks? I'm thinking the 2nd NIC/network may be unnecessary.

My two MongoDB Replica Set nodes also have three network interfaces each - very similar to the previous situation:

1. A public network
2. A private network consisting of the primary and secondary MongoDB Replica Set nodes
3. A private network consisting of the primary, secondary and arbiter MongoDB Replica Set nodes

Does this network configuration, make sense? Do I have the "right" number of NICs and networks? I'm thinking the 2nd NIC/network may be unnecessary.

Here is the simpler version I'm considering:

UPDATE: