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Which fields are added to an Ethernet frame when using Q-in-Q?
Correct Answer: A
Explanation/Reference: IEEE 802.1ad is an Ethernet networking standard informally known as QinQ and is an amendment to IEEE standard IEEE 802.1Q-1998. The conventions for 802.1ad terminology typically are as follows: The inner tag is the tag which is closest to the payload portion of the frame; it is officially called C-TAG (Customer tag, with ethertype 0x8100). The outer tag is the one closer/closest to the Ethernet header; its name is S-TAG (Service tag, ethertype 0x88a8). References: https://en.wikipedia.org/wiki/IEEE_802.1ad