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Difficulty: EasyOSI Model Layers and Functions

A network technician is installing a new edge router to interconnect two separate corporate subnets. At which OSI model layer do routers operate to forward packets using logical IP addressing?

  1. A
    Data Link Layer (Layer 2)
  2. Network Layer (Layer 3)Answer
  3. C
    Transport Layer (Layer 4)
  4. D
    Physical Layer (Layer 1)

Answer

Network Layer (Layer 3)
Routers operate primarily at the Network Layer (Layer 3) of the OSI model. At Layer 3, network traffic is packaged into packets containing source and destination logical IP addresses, allowing routers to determine path choices and forward data across multiple subnets.

Step-by-Step Solution

1
Identify the primary network device and addressing scheme mentioned in the scenario.
The device is a router and the addressing mechanism uses logical IP addresses.
Determining device capability and address type helps place the operation in the correct OSI layer.
2
Map router operations and logical IP packet forwarding to the OSI model hierarchy.
Logical IP routing between subnets is handled specifically by Layer 3 (Network Layer).
Routers inspect Layer 3 IP headers to determine optimal paths across interconnected networks.

Key Concept

OSI Model Layer 3 (Network Layer) Devices and Functions
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Topics

OSI Model Layers and Functions

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