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Zorluk: OrtaVLAN Configuration and 802.1Q Trunking

A network technician is configuring switch ports on an enterprise switch to handle 802.1Q trunking and VLAN operations. Match each switchport interface configuration command on the left with its corresponding frame processing or trunk negotiation behavior on the right.

  • switchport trunk native vlan 99Transmits frames for VLAN 99 across the trunk without inserting an 802.1Q header tag.
  • switchport mode accessForces the port into a permanent single-VLAN membership mode, rejecting 802.1Q trunk encapsulation.
  • switchport trunk allowed vlan 10,20Drops traffic for unlisted VLANs such as VLAN 30 while permitting tagged frames for VLAN 10 and VLAN 20.
  • switchport mode dynamic autoPassively waits to form a trunk link and remains in access mode if the neighboring port is also set to auto.

Cevap

The correct pairings align each command with its operational behavior: native VLAN 99 sends untagged frames across trunks; access mode locks the interface to a single untagged VLAN; allowed vlan 10,20 drops unlisted VLAN traffic; and dynamic auto passively awaits trunk negotiation.
Each switchport configuration statement defines specific frame processing or trunk negotiation behaviors: native VLAN 99 handles untagged trunk traffic; access mode establishes single-VLAN operational ports; allowed VLAN lists prune unapproved VLAN traffic; and dynamic auto passively responds to DTP negotiation.

Adım Adım Çözüm

1
Analyze native VLAN behavior for `switchport trunk native vlan 99`.
Identified that VLAN 99 traffic crosses the trunk without 802.1Q tag headers.
By 802.1Q standard design, native VLAN frames are transmitted untagged across trunk connections.
2
Analyze static access port behavior for `switchport mode access`.
Identified that the port operates exclusively in a single untagged VLAN and rejects trunking.
Access mode explicitly disables trunking encapsulation and assigns the port to one access VLAN.
3
Analyze trunk filtering for `switchport trunk allowed vlan 10,20`.
Identified that unlisted VLANs (e.g., VLAN 30) are blocked while VLAN 10 and 20 are permitted.
The allowed VLAN list acts as a trunk filter, permitting only explicitly allowed VLAN IDs.
4
Analyze negotiation behavior for `switchport mode dynamic auto`.
Identified that the interface passively waits for DTP negotiation requests from its neighbor.
Dynamic auto interfaces will convert to a trunk only if the remote end initiates negotiation via dynamic desirable or trunk modes.

Anahtar Kavram

802.1Q trunking port modes, native VLAN untagged behavior, allowed VLAN filtering, and DTP negotiation dynamics.
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Konular

VLAN Configuration and 802.1Q Trunking

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