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VLANs and 802.1Q Trunking Flashcards

7 cards from real Cisco CCNA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the valid VLAN ID range for extended VLANs on a Cisco switch?

    Answer: 1006–4094

    Extended VLANs use IDs 1006–4094, while normal-range VLANs span 1–1005.

  2. Which command verifies the trunking status and allowed VLANs on interface Gi0/1?

    Answer: show interfaces Gi0/1 trunk

    `show interfaces Gi0/1 trunk` displays trunking mode, encapsulation, and the allowed VLAN list.

  3. A port is configured with `switchport mode dynamic desirable`. What will happen if the neighboring port is set to `switchport mode access`?

    Answer: The port becomes an access port

    Dynamic desirable will form a trunk only if the neighbor also negotiates trunking; an access-mode neighbor causes it to become an access port.

  4. Which 802.1Q field identifies the VLAN to which a frame belongs?

    Answer: VLAN ID (VID)

    The 12-bit VLAN Identifier (VID) field in the 802.1Q tag specifies the VLAN.

  5. What happens to traffic from a VLAN that has been pruned from a trunk link?

    Answer: It is not forwarded across that trunk

    VTP pruning or manual pruning removes a VLAN from a trunk so its traffic is not flooded unnecessarily across that link.

  6. A switch receives a tagged frame with VLAN 10 on a port configured as an access port for VLAN 20. What does the switch do?

    Answer: Drops the frame

    Cisco switches drop tagged frames received on access ports because access ports expect untagged traffic.

  7. What is the purpose of the `switchport trunk native vlan 99` command?

    Answer: Sets VLAN 99 as the untagged VLAN on the trunk

    This command changes the native VLAN on the trunk to VLAN 99, so untagged frames are associated with VLAN 99.