The protocol (802.1x) is a mean of granting/denying access to a network based on a set of rules. It does authentication, which is itself end-to-end encrypted, b

The protocol (802.1x) is a mean of granting/denying access to a network based on a set of rules. It does authentication, which is itself end-to-end encrypted, but it doesn't provide confidentiality, meaning no encryption. Also, I'm not sure, but I believe it doesn't protect againts active MITM attacks (also meaning injecting packets). There's another set of protocols, 802.1AE or MACSec, which should do what you ask.