What are the two special fields that the VXLAN GPO header carries?

The VXLAN GPO (VxLAN Generic Protocol Header) is designed to encapsulate Layer 2 Ethernet frames within a Layer 3 UDP packet. Two critical fields that the VXLAN GPO header carries are the Virtual Network Identifier (VNI) and the Segment ID. The Virtual Network Identifier serves as a 24-bit identifier that defines the logical overlay network and allows for the creation of multiple virtual networks over a shared physical infrastructure.

By using this identifier, VXLAN can efficiently support network segmentation and isolation across an expansive number of virtual networks, as it enables thousands of unique segments. The Segment ID is not a standalone term commonly used in VXLAN; instead, it's typically referred to within the context of the VNI. Therefore, the correct choice highlights the essential role of the Virtual Network ID in identifying and managing virtualized network segments within a VXLAN environment.