200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ982

IP Connectivity

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Refer to the exhibit. After the switch configuration, the ping test between PC A and PC B fails. Based on the output for switch 1, which error must be corrected?

  • A The PCs are in the incorrect VLAN.
  • B All VLANs are not enabled on the trunk.
  • C Access mode is configured on the switch ports.
  • D There is a native VLAN mismatch.
Explanation

On an 802.1Q trunk, both sides must agree on the native VLAN. Untagged frames are placed into the native VLAN at each end. If Switch 1 uses native VLAN 1 and Switch 2 uses native VLAN 99, return traffic tagged as VLAN 99 will be interpreted as VLAN 1 on Switch 1, preventing proper forwarding and breaking the ping. Correcting the native VLAN mismatch resolves the connectivity issue.

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