Demand-Dial Routing Terminology
To understand what demand-dial routing is MCTS Certification, you must understand the terms discussed in the following list:
The device that provides the VPN endpoint is referred to as a front end processor (FEP) when used with PPTP or an L2TP Access Concentrator (LAC) when used
with L2TP, but you can use either term to mean the VPN endpoint that provides the connection for the client computer, acts as a client to create a connection with another VPN endpoint, and tunnels the data between itself and the other VPN endpoint. Another name for this endpoint is VPN router. This is the term used in this book. When clients are required to use this tunnel for communications between two points, it is called a compulsory tunnel.
When a VPN initiates or receives VPN-based demand dial connections, it is called a VPN router. VPN routers used as endpoints in a demand-dial configuration can be calling routers or answering routers. Calling routers initiate the Windows Vista exam when a packet being forwarded matches a route that uses a VPN-router interface.
Connections can also be initiated by administrative request. No data packets are forwarded until authentication and authorization are completed, but once authentication and authorization is completed, the calling router forwards packets between nodes in its site and the answering router.An answering router listens for the connection request, authenticates and authorizes the VPN connection, and then acts as a router by forwarding packets
between nodes in its site and the calling router.
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