Network Troubleshooting.


General Troubleshooting

Verifying Connections


Verifying interface connections

Using trace route

Monitoring and documentation

Learn about the hosts on the network

Troubleshooting Wireless Networks (WLAN)

Methodical approach

Incorrect channel setting

Identifying problems with device Placement

Problems with authentication and encryption

Troubleshoot Access Control List (ACLs) errors

Troubleshoot DHCP errors

Troubleshooting Network Address Translation (NAT)

Using show command

Using debug command

Troubleshooting VLANs and Trunks

Common trunk problems

Native trunk mismatch

Trunk mode mismatch

Allowed VLANs on trunks

Incorrect VLANs IP subnet configurations

Troubleshooting VTP Configurations

Incompatible VTP versions

VTP password Problems

Incorrect domain names

Server switch set to client mode Incorrect revision number

Managing VLANs in a VTP enabled Network

Troubleshooting Inter-VLAN Routing

Switch Configuration Issues
Router-on-a-Stick Issues

Troubleshooting Frame Relay Networks

Troubleshooting and Verifying OSPF Configuration

Using The CDP Show Command