In order to log in to the C-N Eagles or any C-N network from a chromebook, you need to change the following settings when the wifi login screen pops up:
Under "EAP method," select PEAP
Under "EAP Phase 2 authentication," select MSCHAPv2
Leave Serve CA certificate as Default
For "Identity," use your CN username (just the username)
For the Password: your CN password
Leave the Anonymous Identity blank.
Save identity and password and click to "Connect"
Note: If you are still unable to connect, it may be that your computer is trying to connect to another C-N network. You may need to go into the other network settings and select the option to "Forget network."
You can also select to "Prefer" or "Automatically connect" to C-N Eagles or whichever network you want to use.