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.
Get 31 Days Before Your CCENT Certification now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
