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Difficulty: MediumOSI Model Layers and Functions

A field technician is troubleshooting an intermittent connection between devices situated across two distinct subnets. Diagnostics reveal that intermediate network equipment makes forwarding decisions by inspecting logical IP destination addresses and managing packet fragmentation when encountering path MTU limits. At which layer of the OSI model do logical addressing and packet fragmentation primarily occur?

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

Answer

The Network layer is responsible for logical addressing, path determination across subnets, and handling packet fragmentation.
The Network layer is the correct choice because Layer 3 of the OSI model is responsible for logical addressing (such as IPv4 and IPv6), determining the optimal path for packets across subnets (routing), and fragmenting packets when path MTU limits are exceeded.

Step-by-Step Solution

1
Analyze the functional requirements presented in the scenario.
Identified requirement for logical IP addressing, cross-subnet forwarding, and path MTU packet fragmentation.
Connecting devices across different subnets requires logical network addresses rather than local hardware access control.
2
Map identified functions to the appropriate OSI model layer.
Layer 3 (Network layer) defines IP addressing, routing protocols, ICMP messaging, and IP packet fragmentation.
Routing and logical destination lookup take place at Layer 3 of the OSI model.

Key Concept

OSI Network Layer Functions (Layer 3)
Estimated Time:1m 0s
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Topics

OSI Model Layers and Functions

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