List at least three things to check when troubleshooting Layer 1 problems.

List at least three things to check when troubleshooting Layer 1 problems.

Check for bad cables or connections:

• Use a cable tester to verify that the cable from the source interface is properly connected and is in good condition.
• When you doubt a cable’s integrity, swap the suspect cable with a known working cable.

Make sure that the correct cabling standard is adhered to throughout the network:

• Verify that the proper cable is being used for the connection.

Check that devices are cabled correctly:

• Verify that all cables are connected to their correct ports or interfaces.

Verify proper interface configurations:

• Check that all switch ports are set in the correct VLAN and that spanning-tree, speed, and duplex settings are correctly configured.
• Confirm that any active ports or interfaces are not shut down.

Check operations statistics and data error rates:

• Use Cisco show commands to check for statistics such as collisions, input, and output errors.
• The characteristics of these statistics vary depending on the protocols used on the network.

Exam with this question: EWAN v4 Chapter 8 Check Your Understanding: Network Troubleshooting