What is the TPID value defined by IEEE 802.1Q?
TPID (Tag Protocol Identifier) is a field in the VLAN tag that identifies 802.1Q-tagged frames.
The correct TPID value for 802.1Q is 0x8100.
0x9100 (B) is used for Q-in-Q (double tagging).
0x7200 (A) and 0x8200 (D) are incorrect values.
Thus, the correct answer is C (0x8100).
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