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Which of the following is not a MAC address?
00-11-20-M1-BC-B0
00-12-C0-D7-AC-5B
AA-12-C1-E5-CD-31
FA-BC-10-2C-C5-33
The correct answer is 00-11-20-M1-BC-B0, because the MAC address consists of 6 groups of Hexadecimal characters and the letter M in the 3rd group is the only character that is not a Hexadecimal character.
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