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

Delving into network prefixes and subnet masks

In this book, you may have seen various IPv4 and IPv6 addresses written in the format of or 2001:DB8:0:1111:FE99:47FF:FE75:CEE0/64 and you’re wondering what the /24 and /64 values are at the end of the IP addresses. The /x value that’s appended to the end of the IP address is referred to as the network prefix and represents the subnet mask in a simplified format. Additionally, the x value is calculated based on the total number of bits, which are 1s within the subnet mask of the IPv4 or IPv6 address.

To gain a better understanding, let’s consider an IPv4 address such as, which has a default subnet mask of The following table shows the binary notation of the Class A subnet mask:

Figure 5.2 – Class A subnet mask

As shown in the preceding table, there are a total of 8 bits, which are 1s within the subnet mask. Therefore, the network prefix is /8. Rather...