GSLC · Question #231
Every network device contains a unique built in Media Access Control (MAC) address, which is used to identify the authentic device to limit the network access. Which of the following addresses is a va
The correct answer is D. A3-07-B9-E3-BC-F9. A valid MAC address is a 48-bit hardware identifier expressed as exactly six pairs of hexadecimal digits, commonly separated by hyphens or colons per the IEEE 802 standard.
Question
Every network device contains a unique built in Media Access Control (MAC) address, which is used to identify the authentic device to limit the network access. Which of the following addresses is a valid MAC address?
Options
- AF936.28A1.5BCD.DEFA
- B1011-0011-1010-1110-1100-0001
- C132.298.1.23
- DA3-07-B9-E3-BC-F9
How the community answered
(29 responses)- A7% (2)
- B3% (1)
- C3% (1)
- D86% (25)
Why each option
A valid MAC address is a 48-bit hardware identifier expressed as exactly six pairs of hexadecimal digits, commonly separated by hyphens or colons per the IEEE 802 standard.
F936.28A1.5BCD.DEFA contains four groups of four hex digits totaling 64 bits, which exceeds the 48-bit MAC address standard and is not a valid MAC format.
1011-0011-1010-1110-1100-0001 is binary notation rather than hexadecimal - MAC addresses are always represented in hex, making this format invalid.
132.298.1.23 uses dotted-decimal IPv4 address notation rather than hexadecimal MAC notation, and the value 298 is also out of the valid 0-255 octet range.
A3-07-B9-E3-BC-F9 is a valid MAC address because it consists of exactly six octets expressed as valid hexadecimal pairs (digits 0-9 and A-F) separated by hyphens, conforming precisely to the IEEE 802 48-bit EUI-48 format.
Concept tested: MAC address format and IEEE 802 EUI-48 structure
Source: https://standards.ieee.org/products-services/regauth/index.html
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