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In any case if you use WPA/WPA2 (Wi-Fi Protected Access) either PSK or Enterprise the layer 2 of the communication is encrypted.
WPA Enterprise (your case) uses a IEEE 802.1x RADIUS server to authenticate and dynamically generate and exchange the encryption keys. In addition, the keys are renewed during the same session. For this reason WPA Enterprise is more secure than WPA with Pre-Shared Key. The encryption keys are very hard to be guessed because are continuously changed.