Which three elements must be used when you configure a router interface for VLAN trunking? (Choose three.)

Question

Options

• Aone physical interface for each subinterface
• Bone IP network or subnetwork for each subinterface
• Ca management domain for each subinterface
• Dsubinterface encapsulation identifiers that match VLAN tags
• Eone subinterface per VLAN
• Fsubinterface numbering that matches VLAN tags

• A
  13% (3)
• B
  79% (19)
• C
  4% (1)
• F
  4% (1)

Explanation

Router-on-a-stick VLAN trunking requires: (B) one unique IP subnet per subinterface so that each VLAN has its own Layer 3 gateway and routing domain; (D) encapsulation identifiers (e.g., encapsulation dot1q <vlan-id>) on each subinterface that match the 802.1Q VLAN tags on the trunk; and (E) one subinterface per VLAN so each VLAN has a dedicated logical interface. A is incorrect because multiple subinterfaces share one physical interface-that is the entire point of the design. C is incorrect because management domains are a VTP concept, not a subinterface requirement. F is incorrect because subinterface numbers (e.g., Fa0/0.10) do not have to numerically match VLAN IDs-though it is a common best practice, it is not a functional requirement.

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