As the QA department wants to ensure their tests are always run on “clean” servers, the QA
department’s workflow is typically: Create a VM, run a test, destroy the VM. Given that nobody
outside the small QA group needs to contact these test servers, which vCloud Networking and
Security feature will allow you to easily allocate IP addresses to the QA test servers on the fly?

A.
Firewall

B.
NAT

C.
DHCP

D.
VPN

Explanation:
http://www.virtual-blog.com/2012/12/how-to-configure-dhcp-server-using-vcloudnetworking-and-security-edge-device-vshield/