Fedora 21 workstation seems to come with a lot of virtualization features and most of the libvirt libraries installed. I only had to add the KVM virtual-manager which is the KVM application I am more familiar with. However, the new version of the libvirt* libraries have networking features that are great for the data centre environment, but maybe not the best option for a particular workstation, so I added the following packages in order to set up an easier network configuration for my local virtual machines.
In order to reflect the changes and start using the new features, we need to restart its service:
After that, when creating a new virtual machine, the NAT option is enabled, and the virtual manager with handle the NAT or bridging configuration automatically, which allows me to deploy new machines faster.