GCFA · Question #250
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…
The correct answer is B. A3-07-B9-E3-BC-F9. A valid MAC address consists of exactly 6 groups of 2 hexadecimal digits separated by hyphens or colons, representing 48 bits total.
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
- A132.298.1.23
- BA3-07-B9-E3-BC-F9
- CF936.28A1.5BCD.DEFA
- D1011-0011-1010-1110-1100-0001
How the community answered
(16 responses)- A6% (1)
- B75% (12)
- C13% (2)
- D6% (1)
Why each option
A valid MAC address consists of exactly 6 groups of 2 hexadecimal digits separated by hyphens or colons, representing 48 bits total.
132.298.1.23 follows dotted-decimal notation used for IPv4 addresses, and the value 298 exceeds the valid octet range of 0-255, making it invalid as both an IP and MAC address.
A3-07-B9-E3-BC-F9 is a valid MAC address in the standard IEEE 802 format - it contains exactly 6 octets represented as 2-digit hexadecimal values separated by hyphens, totaling 48 bits.
F936.28A1.5BCD.DEFA uses 4 groups of 4 hex digits (64 bits total), which does not match the 48-bit MAC address standard and resembles no valid network addressing format.
1011-0011-1010-1110-1100-0001 uses binary (base-2) notation rather than the required hexadecimal (base-16) notation that defines MAC address representation.
Concept tested: MAC address format and structure
Source: https://standards.ieee.org/products-programs/regauth/oui/
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