CompTIA Network+ (N10-009)Networking ConceptsEasy

A network technician is troubleshooting connectivity and confirms that a router uses logical addressing to determine the best path to forward packets between different networks. At which layer of the OSI model does this addressing and path determination occur?

  1. ALayer 3 - Network
  2. BLayer 2 - Data Link
  3. CLayer 1 - Physical
  4. DLayer 4 - Transport
Show answer & explanation

Correct answer: A. Layer 3 - Network

The Network layer (Layer 3) handles logical addressing (IP addresses) and routing decisions between different networks. Routers operate primarily at this layer.

Why the other options are wrong

  • B. Data Link layer uses MAC addresses for local frame delivery, not routing between networks.
  • C. Physical layer deals with raw bits and electrical/optical signals, not addressing.
  • D. Transport layer manages end-to-end communication with ports, not routing paths.

OSI Layer 3 - Network

The Network layer is responsible for logical addressing and routing packets between different networks using IP addresses.

  • Routers operate at Layer 3
  • Uses IP addresses for logical addressing
  • Handles path determination and forwarding decisions

Memory trick: 'Please Do Not Throw Sausage Pizza Away' - Layer 3 is Network, home of routing.

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