General Networking Issues

Considerations

• Device configuration review

• Routing tables

• Interface status

• VLAN assignment

• Network performance baselines

Common issues

• Collisions

• Broadcast storm

• Duplicate MAC address

• Duplicate IP address

• Multicast flooding

• Asymmetrical routing

• Switching loops

• Routing loops

• Rogue DHCP server

• DHCP scope exhaustion

• IP setting issues

• Missing route

• Low optical link budget

• Certificate issues

• Hardware failure

• Host-based/network-based firewall settings

• Blocked services, ports, or addresses

• Incorrect VLAN

• DNS issues

• NTP issues

• BYOD challenges

• Licensed feature issues

• Network performance issues