Book Image

CompTIA Network+ N10-008 Certification Guide - Second Edition

By : Glen D. Singh
Book Image

CompTIA Network+ N10-008 Certification Guide - Second Edition

By: Glen D. Singh

Overview of this book

This book helps you to easily understand core networking concepts without the need of prior industry experience or knowledge within this fi eld of study. This updated second edition of the CompTIA Network+ N10-008 Certification Guide begins by introducing you to the core fundamentals of networking technologies and concepts, before progressing to intermediate and advanced topics using a student-centric approach. You’ll explore best practices for designing and implementing a resilient and scalable network infrastructure to support modern applications and services. Additionally, you’ll learn network security concepts and technologies to effectively secure organizations from cyber attacks and threats. The book also shows you how to efficiently discover and resolve networking issues using common troubleshooting techniques. By the end of this book, you’ll have gained sufficient knowledge to efficiently design, implement, and maintain a network infrastructure as a successful network professional within the industry. You’ll also have gained knowledge of all the official CompTIA Network+ N10-008 exam objectives, networking technologies, and how to apply your skills in the real world.
Table of Contents (26 chapters)
Part 1: Networking Concepts
Part 2: Network Implementation
Part 3: Network Operations
Part 4: Network Security and Troubleshooting
Chapter 18: Practice Exam

Software-based tools and commands

In this section, we will discuss some of the most common software tools and commands that technicians use to gather data within their networks.

Packet sniffer

A packet sniffer is a program used to capture packets traversing a network. TCPdump is a command-line packet sniffer, while other packet sniffers may have a graphical user interface, such as Wireshark. A packet sniffer is commonly combined with a protocol analyzer so that network professionals can capture and analyze traffic using a single piece of software. Under normal network configurations, packet sniffers can only capture unicast traffic directed at the host machine, multicast, and broadcast traffic on the network.

The following screenshot shows TCPdump capturing live packets on a network:

Figure 17.9 – A TCPdump packet capture

Therefore, network professionals usually configure monitoring ports on switches or utilize hubs to repeat traffic from other...