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200-150 · Question #240
200-150 Question #240: Real Exam Question with Answer & Explanation
The correct answer is D: 00 00 0C5EA2F3. 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.
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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
Explanation
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.
Common mistakes.
- A. 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.
- B. 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.
- C. 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.
Concept tested. Valid MAC address format at OSI Layer 2 data link layer
Reference. https://standards.ieee.org/ieee/802.3/10422/
Topics
#MAC address#data link layer#OSI model#Layer 2 addressing
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