Wireless network says validating identity
Several reasons: Let me discuss this last point a bit more as it is the key reason to do so (at least in my mind).I apologize for being redundant, but this is the key point.
The certificate alone may provide your authentication or you may also be required to provide a username/password.
Most often this CA certificate is being used to validate the identity of the RADIUS authentication server to which your EAP supplicant is authenticating.
Generally speaking, the EAP supplicant must make a decision on whether it will send your username/password to the authentication server and it is too late to withhold your username/password.
You might have to do this again when we replace the certificate or expand the wireless network.
More information and a step by stap walkthrough can be found in the During the initial configuration you will typically have to accept a certificate.