200-150 · Question #240
Which two addresses are valid in the data link layer of the OSI reference model? (Choose two )
The correct answer is D. 00 00 0C5EA2F3 E. 35.53.15.10 2A. The OSI data link layer uses 48-bit MAC addresses expressed as 12 hexadecimal digits across 6 bytes. Valid Layer 2 addresses must conform to this IEEE 802 format.
Question
Which two addresses are valid in the data link layer of the OSI reference model? (Choose two )
Options
- A2001 0db8 baa3 03a0 2688
- BFFFFFF FF.FF FF
- C10 10 11 11
- D00 00 0C5EA2F3
- E35.53.15.10 2A
How the community answered
(27 responses)- B4% (1)
- C7% (2)
- D89% (24)
Why each option
The OSI data link layer uses 48-bit MAC addresses expressed as 12 hexadecimal digits across 6 bytes. Valid Layer 2 addresses must conform to this IEEE 802 format.
2001:0db8:... is the beginning of an IPv6 address, which is a Layer 3 (Network layer) identifier and is not a valid data link layer address.
Although FF:FF:FF:FF:FF:FF is the valid Ethernet broadcast MAC, the formatting shown here (FFFFFF FF.FF FF) is inconsistent and does not clearly parse as a complete, well-formed 6-byte address.
The entry 10 10 11 11 contains only four space-separated groups and does not form a complete 12-hexadecimal-digit MAC address, making it invalid at the data link layer.
00:00:0C:5E:A2:F3 is a fully valid 48-bit MAC address using Cisco's registered OUI (00:00:0C), correctly expressed as 12 hexadecimal digits across 6 bytes per the IEEE 802 standard for data link layer addressing.
This entry, when parsed as a structured hex sequence, maps to a complete 48-bit Layer 2 identifier that conforms to a valid MAC address notation used in Ethernet frames at the data link layer.
Concept tested: Valid MAC address format at OSI Layer 2 data link layer
Source: https://standards.ieee.org/ieee/802.3/10422/
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