Network and Sharing Center in Windows 7 allows you to determine which networks your computer is connected to and the network designation assigned to those networks. The first time that you connect to a network you must choose a network location. This automatically designates the appropriate firewall and security settings for the type of network that you connect to.
The NLA (Network Location Awareness) feature assigns your Windows 7 computer a network profile based on the properties of a network connection. When you connect to a new network, Windows prompts a dialog box asking you whether the network is a Home, a Domain or a Public network. Additionally, Windows 7 remembers the designation that you assign to the network and associates it with the properties of the network so that every time you connect to that network, the same designation will be applied.