【单选题】
A VXLAN encapsulates a Layer 2 frame in an IP-UDP header, which allows Layer 2 adjacency across router boundaries.
B VXLAN uses the Spanning Tree Protocol for loop prevention.
C VXLAN extends the Layer 2 Segment ID field to 24-bits, which allows up to 4094 unique Layer 2 segments over the same network.
D VXLAN uses TCP as the transport protocol over the physical data center network.
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