19.4. Diameter clients and servers
Diameter clients originate AAA requests. The Diameter server[] services the client's requests within a realm, according to the used Diameter application. Diameter agents provide value-added services for clients and servers.
[] Often referred to as the home server.
Typically, the Diameter client is a Network Access Server (NAS) that performs AAA services for a particular access technology. The NAS needs to authenticate the terminals that are attached to a network before allocating network resources for them: for example, a Wireless Local Area Network (WLAN) access point may need to ascertain the user's identity before allowing access.[]
[] Usually, there exists a prior (billing) relationship between the network provider and the user.
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