At which layer of the OSI model would a MAC address be added during encapsulation?

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BlackTom AI · Accepted Answer

To understand where a MAC address is added during encapsulation, we need to recall how Ethernet frames are constructed in the OSI model.
Option a: network layer. This layer handles logical addressing like IP addresses, not MAC addresses. Encapsulation at this layer involves adding IP headers, not MACs, so this is not where MAC addresses are introduced.
Option b: physical layer. The physical layer concerns the transmission medium and actual bits on the wire. MAC addresses are not added at this layer; it deals with signaling and wiring rather than addressing information.
Option c: transport layer. The transport layer provides end-to-end communication services (like TCP/UDP) and adds headers related to ports and segmentation. It does not introduce MAC addresses; this layer sits above the network layer.
Option d: data link layer. This is the layer where frame-level addressing occurs, including MAC (hardware) addresses. When a frame is created for transmission on a local network, the data link layer encapsulates the packet by adding a frame header and trailer, which includes the source and destination MAC addresses. This is the correct layer for MAC address insertion.

Introduction to Networking (CT043-3-1-IN-25-RESIT)

At which layer of the OSI model would a MAC address be added during encapsulation?

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