In a VXLAN network, similar to how traditional networks use VLAN to divide broadcast domains, VXLAN locally identifies broadcast domains according to which of the following?

Question

Options

• ABD
• BVNI
• CNVE
• DVRF

• A
  82% (32)
• B
  5% (2)
• C
  10% (4)
• D
  3% (1)

Explanation

BD (Bridge Domain) is the correct answer because, in VXLAN implementations (particularly Huawei-based), a BD is the local logical construct that maps directly to a broadcast domain on the device - it plays the same role locally that a VLAN plays in traditional networks, grouping Layer 2 traffic into isolated segments. The BD is then bound to a VNI for VXLAN encapsulation when traffic crosses the overlay network.

Why the distractors are wrong:

• B (VNI) is the 24-bit VXLAN Network Identifier carried in the VXLAN header - it identifies the segment globally across the network, not locally on the device.
• C (NVE) is the Network Virtualization Edge interface (the VXLAN tunnel endpoint/VTEP) - it handles encapsulation/decapsulation, not broadcast domain identification.
• D (VRF) operates at Layer 3 for routing separation, while broadcast domains are a Layer 2 concept.

Memory tip: Let the acronym do the work - BD = Broadcast Domain. Locally, the device thinks in BDs; the network thinks in VNIs. BD is the inside face, VNI is the outside face.

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