Book Image

Learn Computer Forensics – 2nd edition - Second Edition

By : William Oettinger
Book Image

Learn Computer Forensics – 2nd edition - Second Edition

By: William Oettinger

Overview of this book

Computer Forensics, being a broad topic, involves a variety of skills which will involve seizing electronic evidence, acquiring data from electronic evidence, data analysis, and finally developing a forensic report. This book will help you to build up the skills you need to work in a highly technical environment. This book's ideal goal is to get you up and running with forensics tools and techniques to successfully investigate crime and corporate misconduct. You will discover ways to collect personal information about an individual from online sources. You will also learn how criminal investigations are performed online while preserving data such as e-mails, images, and videos that may be important to a case. You will further explore networking and understand Network Topologies, IP Addressing, and Network Devices. Finally, you will how to write a proper forensic report, the most exciting portion of the forensic exam process. By the end of this book, you will have developed a clear understanding of how to acquire, analyze, and present digital evidence, like a proficient computer forensics investigator.
Table of Contents (17 chapters)
15
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16
Index

The Open Source Interconnection (OSI) model

This reference model is just a reference for developers to utilize while they create the protocols and devices that users will use to connect to the network. This layered model has some advantages, such as these:

  • The communication process comprises components that allow for easier development and troubleshooting
  • By following standards, different types of equipment and software can communicate with each other
  • A change in one layer does not affect other layers
  • The standardization of the components allows multiple organizations to develop and deploy components

By using the OSI model, you can have hosts from Microsoft, Apple, UNIX, and Linux connected and communicating to the same network. As shown in Figure 11.1, you can see that the OSI model is made up of seven different layers. The layers are as follows:

Graphical user interface, text, application, chat or text message  Description automatically generated

Figure 11.1: OSI model

You can use a mnemonic to remember the order from layer...