Which encapsulation technique does VXLAN use?

A.
MAC in TCP

B.
MAC in MAC

C.
MAC in UDP

D.
MAC in GRE

Explanation:
VXLAN is a MAC in IP/UDP(MAC-in-UDP) encapsulation technique with a 24-bit segment
identifier in the form of a VXLAN ID.
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nxos/vxlan/configuration/guide/b_NX-OS_VXLAN_Configuration_Guide/overview.pdf