N10-005 · Question #593
Which of the following is an invalid MAC address?
The correct answer is C. 56:AD:BX:89:55:54. A valid MAC address consists of exactly 12 hexadecimal characters (0-9 and A-F); the address containing 'X' is invalid because X is not a hexadecimal digit.
Question
Which of the following is an invalid MAC address?
Options
- AAA:CE:58:FD:90:08
- B44:98:3E:F8:33:23
- C56:AD:BX:89:55:54
- D94:9E:FE:EE:8C:DF
How the community answered
(60 responses)- A2% (1)
- B2% (1)
- C90% (54)
- D7% (4)
Why each option
A valid MAC address consists of exactly 12 hexadecimal characters (0-9 and A-F); the address containing 'X' is invalid because X is not a hexadecimal digit.
AA:CE:58:FD:90:08 contains only valid hexadecimal characters (0-9, A-F) in the correct 6-octet colon-delimited format.
44:98:3E:F8:33:23 is a properly formed MAC address using only valid hexadecimal digits.
The address 56:AD:BX:89:55:54 contains the character 'X' in the third octet, which is not a valid hexadecimal digit. Hexadecimal uses only the digits 0-9 and the letters A-F. The presence of any character outside this set makes the address syntactically invalid and impossible to assign to a real network interface.
94:9E:FE:EE:8C:DF uses only valid hexadecimal characters and follows the correct MAC address format.
Concept tested: Valid hexadecimal MAC address format
Source: https://standards.ieee.org/develop/regauth/tut/eui48.pdf
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