A LAN Area object allows you to easily administer WAN traffic policies for a group of servers.
Once you create a LAN Area object, you can add servers to or remove servers from the LAN Area object. When you apply a policy to the LAN Area, that policy will apply to all the servers in the LAN Area.
Creating a LAN Area object is recommended if you have multiple servers in a LAN that is connected to other LANs by wide area links.
If you do not create a LAN Area object, you must manage each server's WAN traffic individually.