Book Image

Learn Wireshark, - Second Edition

By : Lisa Bock
5 (1)
Book Image

Learn Wireshark, - Second Edition

5 (1)
By: Lisa Bock

Overview of this book

Wireshark is a popular and powerful packet analysis tool that helps network administrators investigate latency issues and potential attacks. Over the years, there have been many enhancements to Wireshark’s functionality. This book will guide you through essential features so you can capture, display, and filter data with ease. In addition to this, you’ll gain valuable tips on lesser-known configuration options, which will allow you to complete your analysis in an environment customized to suit your needs. This updated second edition of Learn Wireshark starts by outlining the benefits of traffic analysis. You’ll discover the process of installing Wireshark and become more familiar with the interface. Next, you’ll focus on the Internet Suite and then explore deep packet analysis of common protocols such as DNS, DHCP, HTTP, and ARP. The book also guides you through working with the expert system to detect network latency issues, create I/O and stream graphs, subset traffic, and save and export captures. Finally, you’ll understand how to share captures using CloudShark, a browser-based solution for analyzing packet captures. By the end of this Wireshark book, you’ll have the skills and hands-on experience you need to conduct deep packet analysis of common protocols and network troubleshooting as well as identify security issues.
Table of Contents (28 chapters)
1
Part 1 Traffic Capture Overview
6
Part 2 Getting Started with Wireshark
11
Part 3 The Internet Suite TCP/IP
16
Part 4 Deep Packet Analysis of Common Protocols
21
Part 5 Working with Packet Captures

Chapter 8: Outlining the OSI Model

Effective packet analysis begins with a solid understanding of the Open Systems Interconnection (OSI) model. The OSI model is a seven-layer framework that outlines how the operating system (OS) transforms, encapsulates, and prepares data for transport on the network. In this chapter, we'll cover the seven layers and the role and purpose of each layer. Additionally, you'll learn how within the OSI model, there are three layers that use a specific address or identifier. The Transport layer has an associated port, The Network layer uses an Internet Protocol (IP) address, and the Data Link layer requires a Media Access Control (MAC) address. So that you are able to differentiate identifiers for each of the layers, we'll review and describe the significance of each one.

Then, we'll take a look at the Protocol Data Unit (PDU) for each layer.

Once done, you will be more familiar with the terminology and have a better understanding...