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When troubleshooting a failure on the DSL connection, which of the following is not a concern as to where you should check for the problem?
Connectivity to the DSLAM of the ISP.
Your Telco's Demarcation-Point, where their copper lines terminate and your inside wiring connects/begins
Coaxial copper cabling.
PPPoE routing.
To check whether there is a problem on the DSL connection, it is important to use the OSI model to verify. First check the DSL connectivity from the user to the DSLAM of the ISP (Check cabling, interfaces, Layer 1, etc), then check whether there is PPPoE routing between user device and ISP (Layer 2), lastly check the IP configuration (Layer 3). The Coaxial Cooper cable is only used on TV Cable broadband Internet access so it is not considered as troubleshooting for DSL. For more information please refer to: http://en.wikipedia.org/wiki/Internetaccess#CableInternet_access
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