N10-005 · Question #728
The MAC address of a network device is used to communicate at which of the following OSI layers?
The correct answer is B. Layer 2. MAC addresses are hardware identifiers used at the Data Link layer (Layer 2) of the OSI model to deliver frames between devices on the same network segment.
Question
The MAC address of a network device is used to communicate at which of the following OSI layers?
Options
- ALayer 1
- BLayer 2
- CLayer 4
- DLayer 5
How the community answered
(40 responses)- A3% (1)
- B90% (36)
- C5% (2)
- D3% (1)
Why each option
MAC addresses are hardware identifiers used at the Data Link layer (Layer 2) of the OSI model to deliver frames between devices on the same network segment.
Layer 1 (Physical) deals with the electrical, optical, or radio signals that carry raw bits and has no concept of addressing.
The Data Link layer (Layer 2) uses MAC addresses to identify source and destination devices within a local network segment. Switches use MAC address tables at this layer to forward frames to the correct port. MAC addresses are not used for end-to-end routing across networks, which is an IP function at Layer 3.
Layer 4 (Transport) uses port numbers, not MAC addresses, to distinguish between services and connections.
Layer 5 (Session) manages communication sessions between applications and does not use MAC addressing.
Concept tested: OSI Layer 2 and MAC address function
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/nic-teaming/nic-teaming
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