Which entity is responsible for maintaining Layer 2 isolation between segments In a VXLAN environment?

Question

Options

• Aswitch fabric
• BVTEP
• CVNID
• Dhost switch

• A
  3% (1)
• C
  91% (30)
• D
  6% (2)

Explanation

VXLAN Layer 2 Isolation Explanation

VNID (VXLAN Network Identifier) is a 24-bit identifier embedded in the VXLAN header that uniquely identifies each logical network segment, functioning similarly to a VLAN ID but with a vastly larger namespace (up to ~16 million segments). By tagging encapsulated frames with a unique VNID, VXLAN ensures that traffic from one segment is never delivered to another, maintaining complete Layer 2 isolation between tenants or network segments.

Why the distractors are wrong:

• A. Switch fabric – This refers to the physical/logical switching infrastructure that moves traffic; it doesn't define or enforce segment boundaries
• B. VTEP (VXLAN Tunnel Endpoint) – VTEPs perform the encapsulation/decapsulation of VXLAN traffic, but they rely on the VNID to know which segment the traffic belongs to
• D. Host switch – The host switch participates in forwarding but is not the mechanism that defines isolation between segments

Memory Tip: Think of VNID = VLAN ID on steroids. Just as a VLAN ID isolates Layer 2 segments in traditional networking, the VNID does the same job in VXLAN - it's literally the "Network ID" that separates networks from each other.

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