Virtual switch
The Hyper-V Virtual Switch is a software-based layer-2 network switch that is available in Hyper-V Manager when you add the Hyper-V Server role. This switch allows us to connect virtual machines to both virtual networks and the physical network. In addition, the Hyper-V Virtual Switch provides policy enforcement for security, isolation, and service levels, and can be extended for advanced management purposes such as anti-virus or diagnostic additions.
You can even extend the default Hyper-V Switch with the well-known Cisco Switch Nexus 1000V. If you are already using Cisco Network infrastructure, you should use this extension and manage the Cisco Nexus 1000V with your existing Cisco Management infrastructure.
Note
There is a free version of this switch extension with essential networking features available at http://bit.ly/1mYS9jW. The advanced edition adds only security features known from the Nexus switching series.
Little known fact There is a free version of this switch extension...