What is contained in the VXLAN header?

Question

Options

• AVXLAN network identifier
• Bsource and destination RLOC ID
• Cendpoint ID
• Doriginal Layer 2 VLAN ID

• A
  92% (33)
• B
  6% (2)
• C
  3% (1)

Explanation

VXLAN Header Explanation

VXLAN (Virtual Extensible LAN) headers contain a 24-bit VXLAN Network Identifier (VNI), which functions similarly to a VLAN ID but supports over 16 million unique network segments, allowing tenant isolation in large-scale virtualized environments. Option B is incorrect because RLOCs (Routing Locators) are associated with LISP (Locator/ID Separation Protocol), not VXLAN. Option C is wrong because Endpoint IDs (EIDs) are also a LISP concept, used to identify endpoints separately from their location. Option D is incorrect because while VXLAN encapsulates the original Layer 2 frame (including any VLAN tags), the VXLAN header itself does not contain the original VLAN ID - that information stays within the encapsulated inner frame.

Memory Tip: Think of VNI = VXLAN's Network ID - just like a VLAN has a VLAN ID, VXLAN has a VNI. The "N" in VNI stands for Network, and the "X" in VXLAN stands for eXtensible - it extends VLANs, so it needs its own identifier to track segments.

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