Which statement about VXLAN is correct?
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Correct answer: VXLAN encapsulates a Layer 2 frame in an IP-UDP header, which allows Layer 2 adjacency across router boundaries..
Why this is the answer
VXLAN (Virtual Extensible LAN) encapsulates a Layer 2 Ethernet frame within a UDP packet. This IP-UDP encapsulation allows Layer 2 segments to be extended across an IP-based underlay network, effectively creating Layer 2 adjacency over routed boundaries. This is a core function of VXLAN, enabling large-scale, multi-tenant data center networks. The incorrect options are: VXLAN does not use Spanning Tree Protocol (STP) for loop prevention; it relies on the underlying IP network's routing protocols and often uses technologies like EVPN for control plane learning and loop avoidance. While VXLAN does extend the Layer 2 Segment ID, it uses a 24-bit VXLAN Network Identifier (VNI), which allows for up to 16 million (2^24) unique Layer 2 segments, not 4094. 4094 is the limit for traditional 802.1Q VLANs. VXLAN uses UDP (User Datagram Protocol) as its transport protocol, not TCP (Transmission Control Protocol). UDP is connectionless and offers lower overhead, making it suitable for high-performance data plane encapsulation.
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