Your network contains a server named Server1 that has the Hyper-V server role installed.
Server1 has two network adapters.
You need to configure Server1 to meet the following requirements:
* All virtual machines (VMs) on Server1 must be able to communicate with other computers on the network.
* The number of virtual network connections must be minimized.
What should you do?

A.
Create one internal virtual network. Clear the Enable virtual LAN identification for management operating system check box for the virtual network.

B.
Create one internal virtual network. Select the Enable virtual LAN identification for management operating system check box for the virtual network.

C.
Create one external virtual network. Clear the Allow management operating system to share this network adapter check box for the virtual network.

D.
Create one external virtual network. Select the Allow management operating system to share this network adapter check box for the virtual network.

Explanation:
External virtual networks. Use this type when you want to provide virtual machines with access to a physical network to communicate with externally located servers and clients. This type of virtual network also allows virtual machines on the same virtualization server to communicate with each other. This type of network may also be available for use by the management operating system, depending on how you configure the networking. (The management operating system runs the Hyper-V role.) For more information, see �A closer look at external virtual networks� later in this topic.
Source: http://technet.microsoft.com/en-us/library/cc816585%28WS.10%29.aspx