Layer by Layer Troubleshooting with a Cisco Router

Remember, if Layer 1 isn’t up, nothing else will work so make sure you start here. Examples of layer 1 are your T1 circuit or your Ethernet cable – physical connectivity. I usually troubleshoot layer 1 and layer 2 in union because they are so closely paired. Examples of layer 2 – data link – are your line protocol (such as Ethernet, ATM, 802.11, PPP, frame-relay, HDLC, or PPP).

(Davis, 2009)


About RamesesIII

Adjunct Instructor ITT-Tech IT Dept. View all posts by RamesesIII

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