Your company has a Microsoft Hyper-V Server 2008 R2 environment. You manage the virtual environment by using Microsoft System Center Virtual Machine Manager （VMM） 2008 R2. You are creating a virtual test environment by installing two child partitions. The test environment must be completely isolated from all production servers. You need to ensure that the child partitions can communicate with each other.
Which connection type should you configure？（）

You have a Windows Server 2008 R2 Hyper-V server with a single network adapter that is connected to a virtual network. The virtual network is configured as External. Virtual machines （VMs） running on the server are not able to communicate with the host server over the network. You need to ensure that VMs running on the server are able to communicate with the host server over the network.
In Virtual Network Manager，what should you do？（）