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Concise explanations of key technical topics found on Cisco's® CCNA™, CCNP™, and CCIE™ exams

Author: Katherine Tallis

Focus: CCNA

Issue Date: Jun 1, 2023

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OSI Reference Model, 2nd Ed.

The Open Systems Interconnection (OSI) model is a cornerstone of network communications. A thorough understanding of its layers and functioning is important for any internetworking professional. This Study Guide presents a model overview and discusses:

  • The seven elements (layers) of communications
  • The functions that happen at each layer of the model
  • Communications within, and between, layers
  • How network adapters, hubs, switches, and routers function within the model
  • Preparing data for transmission between devices at the same layer, and at different layers.

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