You can use OSPFv2 for IPv4 and OSPFv3 for IPv6 at the same time.

You must use OSPFv3 to support both address families.

You can use OSPFv2 to support both address families.

You must use IS-4S to support both address families.

Virtualization allows network administrators to dynamically make configuration changes to all network devices.

Virtualization can lower costs because there are fewer physical devices that need to be purchased and managed.

Virtualization can increase the available network bandwidth because their interface speeds are only limited by the host device.

Virtualization allows network administrators to dynamically add and remove services beingprovided

Security and Internet control is applied at a central location

All sites are able to communicate directly with each other

It is easier for administrators to enforce application-aware services with a single point of management.

IPsec tunnels can be used to secure traffic between sites.