Troubleshooting VLANs and Trunks

Posted: 12th June 2022 by ccna7guru in Packet Tracer, SRWE
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List and briefly explain four common VLAN and trunk configuration errors:
Native VLAN mismatches: Trunk ports are configured with different native VLANs. This configuration error generates console notifications, causes control and management traffic to be misdirected, and poses a security risk.
Trunk mode mismatches: One trunk port is configured with trunk mode “off” and the other with trunk mode “on.” This configuration error causes the trunk link to stop working.
VLANs and IP subnets: User computers, for example, may have been configured with the incorrect IP addresses or subnet masks or default gateways. The result is loss of connectivity.
Allowed VLANs on trunks: The list of allowed VLANs on a trunk has not been updated with the current VLAN trunking requirements. In this situation, unexpected traffic or no traffic is being sent over the trunk.