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Question

Difficulty: MediumOSI Model Layers and Functions

A network technician is using a packet analyzer to inspect network traffic on a local Ethernet segment. The analyzer displays frame headers containing source and destination Media Access Control (MAC) addresses alongside a Logical Link Control (LLC) header. At which layer of the OSI model does this header encapsulation and addressing occur?

  1. Data Link layerAnswer
  2. B
    Network layer
  3. C
    Transport layer
  4. D
    Physical layer

Answer

The Data Link layer
The Data Link layer (Layer 2) of the OSI model operates with frames and uses Media Access Control (MAC) addresses for local node-to-node delivery. It is split into two sublayers: LLC (which interfaces with Layer 3) and MAC (which manages physical media access).

Step-by-Step Solution

1
Identify the data structures mentioned in the packet capture
The packet capture shows Media Access Control (MAC) addresses and a Logical Link Control (LLC) header.
Analyzing specific header elements allows accurate mapping to the corresponding OSI model layer.
2
Map the MAC and LLC components to the OSI model hierarchy
LLC and MAC are the two standardized sublayers of Layer 2 (Data Link layer).
Layer 2 provides physical addressing and structures raw bits into readable frames for local network transport.

Key Concept

OSI Data Link Layer Functions and Sublayers
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Topics

OSI Model Layers and Functions

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