CCNA: Native VLAN & Untagged Traffic on 802.1Q

Bundle lab · $29.99

Hands-on CCNA switching lab focused on the native VLAN and tagging behavior on 802.1Q trunks. Users in one VLAN currently cannot reach their peers across a switch-to-switch trunk; you will standardize the native VLAN away from VLAN 1 to a dedicated parking VLAN, diagnose and correct the trunk configuration, verify the untagged VLAN on both ends, and confirm same-VLAN host reachability across the trunk.

Learning objectives

• Explain how 802.1Q tagging works and why exactly one VLAN rides untagged (the native VLAN).
• Create user VLANs and place end-host access ports correctly on Layer-2 switches.
• Configure an 802.1Q trunk between switches and move the native VLAN off VLAN 1 to a dedicated parking VLAN.
• Harden trunks by aligning the allowed VLAN list and disabling DTP negotiation.
• Use show interfaces trunk and related commands to verify native VLAN, allowed VLANs, and operational trunk state.
• Troubleshoot connectivity when a required VLAN is omitted from a trunk allow-list or when the native VLAN is inconsistent.

Troubleshooting focus

• Native VLAN left as VLAN 1 or set inconsistently between trunk ends
• Required VLAN not permitted in the trunk's allowed list
• Host access port assigned to the wrong VLAN
• Forgetting to create a VLAN on both switches' VLAN databases
• Assuming a working trunk despite DTP/nonegotiate or pruning changes