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Learn Wireshark

Learn Wireshark

By : Lisa Bock
4.9 (7)
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Learn Wireshark

Learn Wireshark

4.9 (7)
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)
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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

Recognizing the purpose of DNS

Anyone who has even had a basic networking class will be familiar with DNS. This well-known protocol provides an essential service of translating a human-readable hostname into a machine-readable numeric IP address.

In this section, we'll cover the concept of how DNS works, along with a brief history of how it all began. We'll then move on to a review of the different types of servers involved in resolving an IP address and finish up with comparing the ways DNS is transported.

Let's start with a discussion of why DNS is so essential.

Mapping an IP address

DNS resolves addresses for hosts and services, along with any object that is connected to the internet. In addition, it is also required to deliver email, defend against spam, or initiate a Voice over Internet Protocol (VoIP) conversation.

Whenever a host makes a request to access a resource, the process moves through a series of servers to make the name resolution....

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