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Click on the network manager icon and choose moobilenetx.
(Note: moobilenetx is preferred if supported by your wireless card.)

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In the dialog box that opens up, change Authentication to Protected EAP (PEAP).
Fill in the username and password with your UC Davis loginID and kerberos passphrase.
Finally, click Connect.

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A box prompts you about choosing a certificate authority. Check the box Don't warn me again and then click Ignore.

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Congrats! If all goes well you are now connected. You only have to do this setup once. Simply open your laptop when in range and it will connect automatically now.

Problems?
If your wireless card does not support WPA encryption, use regular
moobilenet. (no 'x')
If these settings do not seem to work, first
change your passphrase.
(Your account just needs to go through that process and be refreshed on all systems.)