Which field is carried in the VXLAN header?
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Correct answer: VXLAN network identifier.
Why this is the answer
The VXLAN network identifier (VNI) is a 24-bit field in the VXLAN header that uniquely identifies a specific VXLAN segment. This allows for up to 16 million unique VXLAN segments, significantly more than the 4096 VLANs supported by 802.1Q. The VNI is crucial for isolating traffic between different virtual networks over a shared underlay network. Source and destination RLOC IDs (Routing Locator IDs) are concepts from LISP (Locator/ID Separation Protocol), not directly part of the VXLAN header. An endpoint ID refers to the MAC or IP address of a device within the VXLAN segment, not a field in the header itself. While VXLAN encapsulates original Layer 2 frames, the original Layer 2 VLAN ID is not carried as a separate field in the VXLAN header; its information is part of the encapsulated Ethernet frame.
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