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Supplicant Definition: A supplicant is a client device on a network that requests access to the network and must authenticate itself to gain permissions and access resources.
A supplicant refers to a client device or user that is requesting network access from a network access server (NAS), typically in the context of 802.1X authentication. The supplicant initiates the authentication process by sending its credentials to the authentication server via the NAS in order to gain access to the network.