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Table Of Contents  CertiGuide to Network+
 9  Chapter 0111: Wide Area Networking
      9  VI  TCP/IP Encapsulation for High-Speed Internet Connections

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Making Dedicated Access Look Like On-Demand
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PPPoE

The answer was another encapsulation protocol, PPPoE (PPP over Ethernet). PPPoE runs the PPP protocol over an Ethernet connection, in contrast to the original PPP, which runs it over a serial modem connection (usually a dialup modem)

PPPoE allows users to connect to their broadband ISP’s with Dial Up Networking the same way they’d connect to a POTS or ISDN ISP connection. It lets ISP’s use the tools that have worked with PPP users for years to validate logins and passwords, track network log in and log out … and even kick users off the network if they’ve been on it for too many consecutive hours using that connection.

Many but not all broadband ISP’s use PPPoE. For example, DSL-based ISP’s who make use of this technology include Ameritech and Earthlink. Because PPPoE technology improves resource management for ISP’s, expect to see it used by more and more ISP’s as broadband connections become more popular.

PPPoE Setup

To connect to an ISP using PPPoE via DSL, you need a user ID and password in addition to your DSL device connection parameters


[spacer]Watch the hardware in PPPoE

A challenge for users with ISP’s who use PPPoE is that not all cable and DSL modems commercially available support PPPoE connections. Many still assume an always-on dedicated connection. This means that if you don’t opt to use equipment provided or specified by your ISP, you must be extra cautious when buying hardware to connect your DSL or cable modem connection to your computer or home LAN.


This concludes our discussion of common remote access technologies and protocols. Next, we will move into the area of network-to-network communications using wide area networking.


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Making Dedicated Access Look Like On-Demand
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Pop Quiz 0111.01
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