I have Windows 7 installed in my laptop. When I pluged eithernet to my router at home, Windows name the adapter as "Local Area Connection", when I connect my laptop at office, it name the adapter as "Local Area Connection 2". I have similar network devices and configurations at home and office.
I noticed that when Windows consider it connected to a new network, it does 2 things.
Change the name of the network adapter to "Local Area Connection 2" (and next time "Local Area Connection 3", etc).
It prompt a dialog to let me choose the network location ("Home", "Work" and "Public").
What is a "new connection" considered by Windows. Maybe ip address or DHCP settings?