In OS X there are two configuration methods for 802.1X. The first method is automatic configuration via the selection of a Wi-Fi network that requires WPA/WPA2 Enterprise authentication. The second method is "semi-automatic" configuration via an 802.1X configuration profile provided by an administrator.

A network client uses the subnet mask to determine whether the destination IP address is on the LAN. If the destination IP address isn't on the LAN, it's assumed the destination address is on another network, and the client sends the data to the IP address of the local network router. The network router then sends the data, via a WAN connection, on to another router that it thinks is closer to the destination. This continues across WAN conn

In the Mac App Store, you can view the current Apple ID by selecting Store from the menu bar. You can get further details regarding this Apple ID, by selecting View My Account in the same menu.

The Lookup tab of Network Utility allows you to test name resolution against the currently configured DNS server.