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

Understanding the purpose of the subnet mask

Both IPv4 and IPv6 addresses have an accompanying subnet mask. The subnet mask plays a very important role within the network and helps a sender device determine whether to forward a message to the default gateway or not. The following are the important key characteristics of the subnet mask and its responsibilities:

  • An IPv4 subnet mask has the same length as an IPv4 address, which is 32 bits in length, while an IPv6 subnet mask is 128 bits in length.
  • The subnet mask is used with an IPv4 or IPv6 address to help devices identify the network and host ports of the IP address.
  • The subnet mask is used to help devices and network professionals determine the total number of IP addresses and usable (assignable) addresses within an IP network.
  • The subnet mask helps a sender device determine whether the destination host is on the same IP network as the sender or on another network. If the destination host is on another IP subnet...