Selecting a default wi-fi connection I have multiple wifi connections in my campus (XYZ-Open, XYZ-Secure and XYZ-Guest) where XYZ-Secure is a secure connection and asks for authentication. Students use the secure connection which has a better bandwidth than the rest.

The issue is this: When my mac returns from a sleep mode or powers up, it chooses the XYZ-Open all the time by default and I need to manually switch to the secure connection each time. Is there an option to make XYZ-Secure the default connection which my mac should connect?

Thanks.
You can change the preferred network simply by dragging it to the top of the list.

Lion: System Preferences -> Network -> Wi-Fi  -> Advanced

Older OS: System Preferences -> Network -> Airport  -> Advanced