The Trusted Network Connect (TNC) is based on the double concepts of integrity and identity. The Policy Enforcement Point (PEP) in TNC architecture is deeply studied and powerful Broadband Remote Access Server (BRAS) is also applied into the architecture. The new BRAS model is able to set up access control rules in accordance with the level of trust, filter traffic according to filtering rules and forward dual-authentication messages. Both Protocol for Carrying Authentication and Network Access (PANA) and Diameter protocols are used to communicate between the BRAS and other entities such as access terminal, authentication server and trusted remediation server for providing authentication, authorization and accounting services.