To establish a connection to a 802.11n wireless Internet signal, the essential requirement is a Proper SSID (Service Set Identifier).
How to explain
The SSID is the network name that identifies the wireless network. Users need to select the correct SSID from the available networks to connect. MAC address filtering restricts device access but isn't necessary for connection setup.
A Windows password and SSL certificate relate to security and encryption but are not directly related to establishing the initial connection to the wireless network. The Proper SSID is crucial as it allows users to identify and connect to the specific wireless network they intend to join.