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31 Days Before Your CCENT Certification by Scott Bennett

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CCNA Discovery 2, Chapter 2

2.2.3: Layer 2 troubleshooting involves the network interface cards (NIC) in hosts on the network and your network switches. A quick way to isolate the issue is to replace a NIC or switch that appears faulty and test connectivity on the network. Although replacing a NIC is cost-effective, you might want to check the configuration and software on a switch before replacing the device.

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