What is the VXLAN network identifier used to identify?

Question

Options

• Anetwork tunnel interface
• Bbroadcast domain
• Cvirtual tunnel endpoint
• DIP subnet

• A
  2% (1)
• B
  88% (36)
• C
  2% (1)
• D
  7% (3)

Explanation

VXLAN Network Identifier (VNI) Explained

A VXLAN Network Identifier (VNI) is a 24-bit value used to identify a specific broadcast domain (Layer 2 segment), allowing up to 16 million unique virtual networks to be overlaid on a physical network - this is analogous to how a VLAN ID identifies a broadcast domain, but on a much larger scale.

Why the distractors are wrong:

• A (network tunnel interface) - Tunnels are identified by their VTEP (Virtual Tunnel Endpoint) addresses, not the VNI
• C (virtual tunnel endpoint) - VTEPs are identified by their IP addresses, which are used to encapsulate/decapsulate VXLAN traffic
• D (IP subnet) - IP subnets operate at Layer 3; the VNI operates at Layer 2 and does not directly map to an IP subnet

Memory Tip: Think of VNI as a "super VLAN ID." Just as a VLAN ID identifies a broadcast domain on a local switch, the VNI identifies a broadcast domain across a VXLAN overlay network. VNI = Virtual Network = broadcast domain boundary.

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