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Zorluk: KolayTroubleshooting VLAN, Trunking, and Switching Issues

A network technician is troubleshooting a switch-to-switch trunk link that is dropping traffic. Reviewing the switch console logs reveals a native VLAN mismatch error, while interface statistics report high numbers of late collisions. Which TWO configuration actions should the technician take to resolve these issues? (Select TWO.)

  1. Reconfigure both ends of the trunk link to use the same native VLAN ID.Cevap
  2. Configure matching duplex settings (or enable auto-negotiation on both ends) for the trunk interfaces.Cevap
  3. C
    Set the Spanning Tree Protocol (STP) priority to 0 on both switches to clear the interface block.
  4. D
    Assign IP addresses from different subnets to the two switch interfaces without a Layer 3 router.

Cevap

The technician should configure identical native VLAN IDs on both switch trunk ports and ensure matching duplex settings across the link.
To resolve native VLAN mismatch errors, both ends of the 802.1Q trunk must be configured with the exact same native VLAN ID so untagged frames are correctly directed. To resolve late collisions, both switch ports must agree on duplex settings (either both forced to full-duplex or both using auto-negotiation), eliminating collision detection conflicts.

Adım Adım Çözüm

1
Identify the causes of the reported trunk errors from the symptoms.
The log message indicates an 802.1Q native VLAN mismatch, while late collisions point to a duplex mismatch.
Late collisions occur when one side operates in full-duplex while the other operates in half-duplex, while native VLAN mismatch occurs when trunk endpoints use different untagged VLAN IDs.
2
Select the correct remediation for native VLAN mismatch.
Aligning the native VLAN ID on both switch trunk interfaces resolves frame leakage and drops.
802.1Q trunking requires both ends of a trunk to agree on which VLAN carries untagged traffic.
3
Select the correct remediation for duplex mismatch.
Configuring matching duplex settings (or auto-negotiation on both sides) restores clean frame transmission.
Matching duplex settings ensures both ports transmit and listen according to the same collision rules.

Anahtar Kavram

Troubleshooting 802.1Q native VLAN mismatches and interface duplex mismatches on switch trunks.
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Troubleshooting VLAN, Trunking, and Switching Issues

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