Purpose

Force Airport to join asu wireless network

Step by step

Open System Preferences> Network > Airport

Select the dropdown “By default, join:” change from Automatic to Preferred networks

In the Network List Make sure only asu is listed. Delete anything else if it is there

Click Options

Set “If no preferred networks are found:” to “Keep looking for recent networks”

Uncheck the “Automatically add new networks to the preferred networks list”

Click OK then Apply Now

Restart the Mac and make sure Airport connects only to the  asu network