Introduction to the OSI Model (N10-009)

Welcome to the Introduction to the OSI Model Practice Lab. In this module, you will be provided with the instructions and devices needed to develop your hands-on skills.

The OSI (Open Systems Interconnection) model comprises seven layers, each assigned a unique number from 1 to 7. These layers, from bottom to top, are:

  • Layer 1 – The Physical Layer is responsible for the physical transmission of data over the network medium.
  • Layer 2 – The Data Link Layer manages the reliable transfer of data frames between nodes on the same network.
  • Layer 3 – The Network Layer handles routing and addressing to facilitate communication across multiple networks.
  • Layer 4 – The Transport Layer ensures end-to-end delivery of data with error detection and correction.
  • Layer 5 – The Session Layer establishes, manages, and terminates connections between applications.
  • Layer 6 – The Presentation Layer is responsible for data translation, encryption, and compression.
  • Layer 7 – The Application Layer provides network services and interfaces for user applications.

These layers collectively define the functions and interactions necessary for network communication and interoperability.

In this module, you will explore the functions and components of the OSI model layers.

Overview

Learning Outcomes:

In this module, you will complete the following exercises:

  • Exercise 1 – OSI Model Layers 1, 2, and 3
  • Exercise 2 – OSI Model Layers 4 and 5
  • Exercise 3 – OSI Model Layer 6
  • Exercise 4 – OSI Model Layer 7

After completing this module, you should be able to:

  • Examine a NIC at Layer 1
  • Examine Interface Statistics and the ARP Table at Layer 2
  • Examine Route Print at Layer 3
  • Use Wireshark to Observe a TCP Connection
  • Use Wireshark to Follow a TCP Stream
  • Conduct File Compression and Encryption
  • Use Nslookup

Exam Objectives:

The following exam objectives are covered in this module:

1.1 Explain concepts related to the Open Systems Interconnection (OSI) reference mode.

  • Layer 1 – Physical
  • Layer 2 – Data link
  • Layer 3 – Network
  • Layer 4 – Transport
  • Layer 5 – Session
  • Layer 6 – Presentation
  • Layer 7 Application
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