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CCNA · 200-301Beginner

VLAN Access Port: Wrong VLAN

A workstation has link but lands in the wrong VLAN. Diagnose the access-port assignment and fix it yourself, live, right below.

Interactive simSwitchingVLAN

Symptom

A user reaches the switch but lands in the wrong broadcast domain. Trace the access VLAN, correct it, and prove same-VLAN reachability.

Your mission

Prove the cause, then fix it

Format

Guided CLI investigation

Start interactive labSee the investigation plan ↓Need a hint? Reveal the root cause ↓
VLAN Access Port: Wrong VLAN

Investigate before you configure.

Use the CLI evidence to isolate the fault, make the smallest safe correction, then verify the network state changed.

Observe the symptom and link state.

Diagnose by comparing the protocol evidence.

Verify the expected device state and confirm the original symptom is resolved.

Console access: SW-ACC1 · SW-ACC2 · PC1

This workspace stacks for portrait phones. Rotate to landscape for the full split-screen console.

Need a hint?

Reveal the root cause when you're ready.

Try the investigation first, then use this as your escape hatch, not a dead end.

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Lab debrief

Turn the session into a repeatable troubleshooting pattern.

Use this reference after your attempt: first explain the symptom, then verify the evidence, then confirm the repair.

The problem

A workstation is connected and has link, but it receives an address from the guest VLAN instead of the engineering VLAN because its switchport is assigned to the wrong access VLAN.

What you'll practice

  • Read access-port VLAN assignment
  • Differentiate access and trunk roles
  • Validate VLAN membership
  • Verify endpoint reachability

The topology

Two access switches carry Engineering and Guest VLANs over a trunk; one endpoint port is intentionally placed in the wrong VLAN.

Commands to run yourself

The real diagnostic commands for this lab, copy-paste ready. Run these in the same order to reproduce the investigation on your own session.

Inspect switchport mode and VLAN
show interfaces Ethernet0/1 switchport
List VLAN membership
show vlan brief
Verify trunks
show interfaces trunk
VLAN access port: wrong VLANPC1 has link on SW-ACC1 but its access port sits in the wrong VLAN.Et0/0 trunkEt0/1 accessEt0/1 accessSW-ACC1Et0/0 trunk · Et0/1 accessSW-ACC2Et0/0 trunk · Et0/1 accessPC1wants VLAN 10PC210.10.10.12 · VLAN 10SW-ACC1 Et0/1 under investigationInspect the port's access VLAN and compare it against the VLAN table.

Frequently asked

Why does the port show connected but still land in the wrong VLAN?

Link state and VLAN membership are independent. A port can be up/up while assigned to the wrong access VLAN, which isolates it from its intended broadcast domain without ever showing a link fault.

Ready to run this lab yourself?

No setup, no image sourcing. Book a session or ask for a live demo.

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