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Additional resources for CCNA Portable Command Guide (2nd Edition)
If the remote user needs to be tunneled to a remote home gateway, one of the VPDN protocols establishes a tunnel between the network access server and the home gateway, and an optional authentication step can validate the identification of the tunnel endpoints. 6. The user PPP connection is encapsulated into a VPDN session from the network access server to the home gateway. 7. The home gateway authenticates the remote user carried in the VPDN session. Upon successful authentication, the home gateway terminates the PPP connection and grants predefined network access privileges to the remote user.
Such a migration allows the service providers to expand their network capacity and service portfolios and protect their investment on the existing network infrastructure. Transitioning to the packet-based AToM pseudowire emulation has minimal impact to the existing Layer 2 VPN services. Advanced Network Services Besides the basic MPLS features such as routing optimization and network consolidation, AToM can leverage advanced MPLS features for enhanced network services, such as MPLS traffic engineering, QoS guarantee, and fast rerouting.
The network access server receives the connection request from the remote user. 3. (Optional) The network access server authenticates the remote user using the specified authentication method, such as Password Authentication Protocol (PAP), Challenge Handshake Authentication Protocol (CHAP), or interactive terminal session. 4. After the remote user is authenticated, an authorization process determines whether the user should be locally terminated or tunneled to a home gateway. 5. If the remote user needs to be tunneled to a remote home gateway, one of the VPDN protocols establishes a tunnel between the network access server and the home gateway, and an optional authentication step can validate the identification of the tunnel endpoints.