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CompTIA® Network+® N10-009 Certification Guide
CompTIA® Network+® N10-009 Certification Guide

CompTIA® Network+® N10-009 Certification Guide: Master networking fundamentals and pass the N10-009 exam the first time

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Profile Icon Ian Neil
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$33.99
Paperback Oct 2025 532 pages 1st Edition
Paperback
$33.99
Arrow left icon
Profile Icon Ian Neil
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$33.99
Paperback Oct 2025 532 pages 1st Edition
Paperback
$33.99
Paperback
$33.99

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CompTIA® Network+® N10-009 Certification Guide

Explain Concepts Related to the Open System Interconnection (OSI) Reference Model

As of 2025, 5.56 billion people worldwide use the internet regularly, meaning that more than two-thirds of the global population is connected to a computer network in one way or another. In the information age, everything from phones to servers, lightbulbs to cameras, and laptops to cars is intertwined through cables and radio waves.

Although the growth of global communication has been largely organic, building a modern network that is stable, secure, and efficient requires careful planning, regular maintenance, and expert troubleshooting. Today’s IT networks come in many forms and are constantly evolving. To be an effective network engineer, you need the skills and knowledge to analyze, manage, and operate an almost infinite variety of network setups.

The CompTIA Network+ exam is designed to validate those skills and that knowledge. Earning this certification gives prospective clients...

What is the OSI model?

Modern IT networks can range from a small setup with just a few computers sharing a printer to vast infrastructures spanning multiple offices, continents, and cloud resources. No matter the size, architecture, or geographical spread, the job of the network engineer is to keep information flowing through that network reliably, efficiently, and securely. To do this, there is a range of physical and virtual appliances, protocols, techniques, and standards. The following chapters will cover these, but before doing so, it’s worth looking at what a network is conceptually.

When you think of a network, you can break it down into its individual components, such as a router or a virtual private network (VPN). You can also consider it in terms of different functions, such as data routing, user interaction, or a mobile device connecting wirelessly. Often, when troubleshooting a problem, you won’t start by identifying which piece of equipment has failed...

Why do we use the OSI model?

The OSI model is used for several key reasons. By providing a standardized framework, the model allows different types of network hardware and software to communicate efficiently. This universal standard helps ensure interoperability between various systems and products from different manufacturers. It is a clear framework for designing and developing network protocols and hardware. It serves as a guideline for manufacturers and software developers to create compatible and efficient networking solutions.

The model’s layered approach enables you to understand how each layer develops and functions independently. This modularity simplifies the troubleshooting and upgrading processes since changes in one layer do not necessarily affect the others.

Summary

This chapter reviewed the OSI reference model, which is a foundational element in the field of networking. The OSI reference model provides a clear, standardized framework that facilitates communication, development, and education in network systems. By segmenting the networking process into seven distinct layers, it enhances the interoperability, scalability, and manageability of networked systems.

The knowledge gained in this chapter will prepare you to answer questions relating to exam objective 1.1 in the CompTIA Network+ (N10-009) exam.

Exam objective 1.1

Explain concepts related to the Open System Interconnection (OSI) reference model

  • Layer 7: Application layer
  • Layer 6: Presentation layer
  • Layer 5: Session layer
  • Layer 4: Transport layer
  • Layer 3: Network layer
  • Layer 2: Data link layer
  • Layer 1: Physical layer

Chapter review questions

Now that you’ve completed the chapter, you can check your knowledge using the practice questions provided in the online platform at https://packt.link/N10-009ch1. You can also use the QR code below.

Reminder

Before you can access the end of chapter questions, mock exams and acronym flashcards, you must first register your purchase of the book.

This can be done with the following steps.

  1. Open the link https://packt.link/N10-009unlock.
  2. Log in to your Packt account or register a new Packt account.
  3. Enter the unique unlock code, which can be found in Chapter 6 page 473.
  4. You are now ready to use all the free resources can come with the CompTIA® Network+® N10-009 Certification Guide.

For a more detailed description, visit Chapter 26 on page 471.

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Key benefits

  • Learn from Ian Neil, bestselling author and world-class CompTIA trainer
  • Build a solid foundation in networking with hands-on skills that advance your career
  • Test your readiness with practice tests that mirror the real exam
  • Save on certification costs with an exclusive 12% Network+ exam discount voucher with this book

Description

Looking to pass the CompTIA Network+ N10-009 exam and advance your IT career? Employers seek certified professionals who can design, secure, and troubleshoot modern networks. Memorizing concepts won’t cut it—you need a practical grasp of networking concepts, and this guide helps you build exactly that. Ian Neil, bestselling author of some of the most trusted CompTIA certification resources and a world-class CompTIA trainer, provides 100% coverage of all N10-009 exam objectives. You’ll start with the networking fundamentals, including the OSI model, topologies, ports, and protocols, then progress to configuring IPv4/IPv6 addressing, routing, switching, VLANs, and wireless networks. You’ll master transmission media and transceivers and strengthen your security expertise with VPNs, IPSec, NAC, IDS/IPS, Zero Trust, and firewalls. Beyond exam prep, this book explores cloud, virtualization, IoT, SDN, and SD-WAN, ensuring you’re prepared for modern IT environments. It helps build your troubleshooting skills using tools such as SNMP, NetFlow, Wireshark, log analysis, and traceroute. With practice questions across 25 chapters, 2 full-length online mock exams, 400 exam-style questions, and a 12% exam discount voucher, this guide equips you with the knowledge, experience, and confidence to earn your Network+ certification on the first try.

Who is this book for?

This book is for early-career IT professionals preparing for the CompTIA Network+ (N10-009) certification, including network administrators, help desk technicians, and junior systems engineers. Candidates are expected to have 9–12 months of hands-on networking experience and a solid understanding of basic IT concepts, though this guide could also be useful for students and career changers who want to build their foundational networking skills. It’s also valuable for those pursuing further certifications like CompTIA Security+ or vendor-specific networking tracks.

What you will learn

  • Map OSI layers and TCP/IP protocols to real-world scenarios
  • Configure routers, switches, and firewalls using IPv4/IPv6 addressing
  • Apply cloud, virtualization, and SD-WAN concepts with VPC and Direct Connect
  • Recognize common ports and protocols such as DNS, DHCP, SNMP, and HTTPS
  • Implement wireless standards (802.11ax/6E), WPA3, and cellular IoT
  • Design resilient topologies like star, mesh, and spine-leaf architectures
  • Secure networks with VPNs, IPSec, NAC, and zero trust principles
  • Troubleshoot using SNMP, NetFlow, packet capture, and traceroute
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Publication date : Oct 10, 2025
Length: 532 pages
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Language : English
ISBN-13 : 9781836649274

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Language : English
ISBN-13 : 9781836649274

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Table of Contents

34 Chapters
Networking Concepts Chevron down icon Chevron up icon
Explain Concepts Related to the Open System Interconnection (OSI) Reference Model Chevron down icon Chevron up icon
Compare and Contrast Networking Appliances, Applications, and Functions Chevron down icon Chevron up icon
Summarize Cloud Concepts and Connectivity Options Chevron down icon Chevron up icon
Explain Common Networking Ports, Protocols, Services, and Traffic Types Chevron down icon Chevron up icon
Compare and Contrast Transmission Media and Transceivers Chevron down icon Chevron up icon
Compare and Contrast Network Topologies, Architectures, and Types Chevron down icon Chevron up icon
Given a Scenario, Use Appropriate IPv4 Network Addressing Chevron down icon Chevron up icon
Summarize Evolving Use Cases for Modern Network Environments Chevron down icon Chevron up icon
Network Implementation Chevron down icon Chevron up icon
Explain Characteristics of Routing Technologies Chevron down icon Chevron up icon
Given a Scenario, Configure Switching Technologies and Features Chevron down icon Chevron up icon
Given a Scenario, Select and Configure Wireless Devices and Technologies Chevron down icon Chevron up icon
Explain Important Factors of Physical Installations Chevron down icon Chevron up icon
Network Operations Chevron down icon Chevron up icon
Explain the Purpose of Organizational Processes and Procedures Chevron down icon Chevron up icon
Given a Scenario, Use Network Monitoring Technologies Chevron down icon Chevron up icon
Explain Disaster Recovery Concepts Chevron down icon Chevron up icon
Given a Scenario, Implement IPv4 and IPv6 Network Services Chevron down icon Chevron up icon
Compare and Contrast Network Access and Management Methods Chevron down icon Chevron up icon
Network Security Chevron down icon Chevron up icon
Explain the Importance of Basic Network Security Concepts Chevron down icon Chevron up icon
Summarize Various Types of Attacks and Their Impact on the Network Chevron down icon Chevron up icon
Given a Scenario, Apply Network Security Features, Defense Techniques, and Solutions Chevron down icon Chevron up icon
Network Troubleshooting Chevron down icon Chevron up icon
Explain the Troubleshooting Methodology Chevron down icon Chevron up icon
Given a Scenario, Troubleshoot Common Cabling and Physical Interface Issues Chevron down icon Chevron up icon
Given a Scenario, Troubleshoot Common Issues with Network Services Chevron down icon Chevron up icon
Given a Scenario, Troubleshoot Common Performance Issues Chevron down icon Chevron up icon
Given a Scenario, Use the Appropriate Tool or Protocol to Solve Networking Issues Chevron down icon Chevron up icon
Accessing the Online Practice Resources Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
Coupon Code for CompTIA Network+ N10-009 Exam Vouchers Chevron down icon Chevron up icon
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