© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Module Summary Modern enterprise networks have to support various remote connection topologies, such as branch offices, SOHO, and teleworkers. Historically, cable referred to the use of coaxial cable for signal transmission. However, today, it can refer to coaxial cable, fiber, or a hybrid. Two of the more popular encapsulation methods used with ADSL are PPPoE and PPPoA. A PPPoE session is established between subscriber devices with PPPoE client support and the aggregation server (PPPoE server).

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Module Summary (Cont.) Three options for deploying PPPoE exist: end-user PC connected to modem, router connected to modem, and router with DLS and PPPoE client functionality. PPPoE provides the ability to connect a network of hosts over a simple bridging access device to an aggregation router. PPPoA is a routed solution in which the Cisco CPE DSL router routes the end-user packet to the DSL service provider. DSL is a high-speed Layer 1 transmission technology that works over copper wires; ATM is used as the data link layer protocol over DSL.

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v1.02-3