Physical NIC requirements for Hyper-V

I already have the Hyper-V OS and hardware minimum requirements from Microsoft.
But I have another question regarding the NIC's.
I know it is recommended that each virtual machine has two NIC's. one for the management of the host and the other NIC should be bound to a virtual switch.

My question is, if I plan on having three virtual machines, each with one NIC for management and one NIC for the virtual switch does that mean I just need two physical NIC's that will be shared across the three virtual machines? If one of the servers needed another NIC, does that mean I would need three physical NIC's in total. Please look at the attachment and let me know if the diagram is a valid configuration.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
I have an EE Article here: Some Hyper-V Hardware and Software Best Practices.

As a best practice one should have a minimum of two Intel NIC ports teamed. A virtual switch that shares that team with the OS could then be created.

In a virtual setting one needs to eliminate all single points of failure.

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Virtual Machines do not need more than two nics....

HOSTs should have at least TWO Physical Nics!

You can use 10Gbe nics, and VLANs, but two at the minimum.

VMs access the nics, using virtual switches.
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Windows Server 2012

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