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CompTIA A+ Guide to IT Technical Support

By Jean Andrews, Joy Dark Shelton, Pamela Claire Schmelz, Walter Jaqua, Jr.

12th Edition © 2027
Discipline:Computing & Information Technology
Course:PC Repair/A+
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Andrews/Shelton/Schmelz/Jaqua Jr.'s "CompTIA A+ Guide to IT Technical Support," 12th Edition, brings clarity to IT fundamentals and skills needed for support roles. Its visual, step-by-step approach uses CompTIA A+ Exam objectives to train learners to diagnose, install, maintain, troubleshoot and network computer hardware and software to sharpen communication skills and deliver clear, confident, customer-first support. Core and advanced topics are blended to emphasize the application of skills across Windows 10/11, macOS, Linux, mobile devices, cloud, virtualization, scripting, security, Active Directory and AI. Lab manuals, interactive simulations, live virtual machine labs and auto-graded MindTap activities let students test ideas, solve problems and sharpen skills as they build competence toward success on the 220 1201/1202 exams and excel as IT technicians or administrators.

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About this product

Andrews/Shelton/Schmelz/Jaqua Jr.'s "CompTIA A+ Guide to IT Technical Support," 12th Edition, brings clarity to IT fundamentals and skills needed for support roles. Its visual, step-by-step approach uses CompTIA A+ Exam objectives to train learners to diagnose, install, maintain, troubleshoot and network computer hardware and software to sharpen communication skills and deliver clear, confident, customer-first support. Core and advanced topics are blended to emphasize the application of skills across Windows 10/11, macOS, Linux, mobile devices, cloud, virtualization, scripting, security, Active Directory and AI. Lab manuals, interactive simulations, live virtual machine labs and auto-graded MindTap activities let students test ideas, solve problems and sharpen skills as they build competence toward success on the 220 1201/1202 exams and excel as IT technicians or administrators.

REALISTIC HARDWARE SIMULATIONS IN MINDTAP pull students into photo-rich, lifelike hardware scenarios that make tough concepts click and deliver a dynamic, learn-by-doing virtual experience.

LIVE VIRTUAL LABS' PROPRIETARY GRADING ENGINE assesses what students do inside live virtual machines as they advance through discovery-driven IT scenarios -- guided to advanced to expert -- delivering authentic skills assessment.

RECORD YOURSELF SCENARIO PRACTICE places students in realistic IT professional situations, prompting them to record responses that build real‑world employability skills, with an AI coach providing instant feedback for continuous improvement.

DISCUSSION ACTIVITIES prompt students to read articles, watch videos or podcasts and join peer conversations -- helping them stay current with IT trends while engaging in meaningful discussion.

Table of contents

Chapters

Cover Page
Title Page
Copyright Page
CompTIA A+ Core 1 (220-1201) and A+ Core 2 (220-1202) Exam Objectives Mapped to Chapters
CompTIA A+ Core 1 (220-1201)
CompTIA A+ Core 2 (220-1202)
Introduction: CompTIA A+ Guide to IT Technical Support
Acknowledgments
About the Authors
Read This Before You Begin
Part 1. CompTIA A+ Core 1 (220-1201)
Part 2. CompTIA A+ Core 2 (220-1202)
Appendix A. Safety Procedures and Environmental Concerns
Appendix B. Entry Points for Windows Startup Processes
Appendix C. CompTIA Acronyms
Show more

Part 1. CompTIA A+ Core 1 (220-1201)

Chapter 1. Taking a Computer Apart and Putting It Back Together
Preview this section ↗
Introduction ↗
Exploring a Desktop Computer ↗
Protecting Yourself and the Equipment ↗
Step 1: Planning and Organizing Your Work and Gathering Your Tools ↗
Step 2: Opening the Case ↗
Step 3: Removing Expansion Cards ↗
Step 4: Removing the Motherboard ↗
Step 5: Removing the Power Supply ↗
Step 6: Removing the Drives ↗
Steps to Put a Computer Back Together ↗
First Look at Laptop Components ↗
Docking Stations and Port Replicators ↗
Special Considerations When Supporting Laptops ↗
Working Inside a Laptop Computer ↗
Exploring Laptop Internal Components ↗
Exploring Inside an All-in-One Computer ↗
Maintaining Laptops ↗
Chapter Summary ↗
Key Terms ↗
Thinking Critically ↗
Hands-On Projects ↗
Real Problems, Real Solutions ↗
Chapter 2. All About Motherboards
Introduction
Motherboard Types and Features
Motherboard Form Factors
Intel and AMD Chipsets and Processor Sockets
Buses and Expansion Slots
Using BIOS/UEFI Setup to Configure a Motherboard
Accessing the BIOS/UEFI Setup Program
Viewing and Monitoring Information
Changing Boot Options
Configuring Onboard Devices
Configuring Security Features
BIOS/UEFI Support for Virtualization
Exiting the BIOS/UEFI Setup Menus
Updating Motherboard Drivers and BIOS/UEFI
Installing or Updating Motherboard Drivers
Updating Firmware
Using Jumpers to Clear BIOS/UEFI Settings
Installing or Replacing a Motherboard
How to Select a Desktop Motherboard
How to Install or Replace a Motherboard
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 3. Supporting Processors and Upgrading Memory
Introduction
Types and Characteristics of Processors
Intel Processors
AMD Processors
ARM Processors
Selecting and Installing a Processor
Selecting a Processor to Match System Needs
Installing a Processor and Cooler Assembly
Memory Technologies
DIMM and SODIMM Technologies
How to Upgrade Memory
How Much Memory Do I Need, and How Much Is Currently Installed?
What Type of Memory Is Already Installed?
How Many and What Kind of Modules Can Fit on My Motherboard?
How Do I Select and Purchase the Right Memory Modules?
How Do I Install the New Modules?
How to Upgrade Memory on a Laptop
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 4. Power Supplies and Troubleshooting Computer Problems
Introduction
Cooling Methods and Devices
Processor Coolers, Fans, and Heat Sinks
Thermal Compound and Thermal Pads
Case Fans, Other Fans, and Heat Sinks
Liquid Cooling Systems
Selecting a Power Supply
Types and Characteristics of Power Supplies
How to Calculate Wattage Capacity
Power Supply Efficiency
Strategies to Troubleshoot Any Computer Problem
Step 1: Interviewing the User and Backing Up Data
Step 2: Examining the System and Making Your Best Guess
Step 3: Testing Your Theory
Step 4: Planning Your Solution and Then Fixing the Problem
Step 5: Verifying the Fix and Taking Preventive Action
Step 6: Documenting What Happened
Troubleshooting the Electrical System
Problems That Come and Go
Power Problems with the Motherboard
Problems with Overheating
Problems with Laptop Power Systems
Troubleshooting the Motherboard, Processor, and RAM
Windows Startup Repair
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 5. Supporting Hard Drives and Other Storage Devices
Introduction
Hard Drive Technologies and Interface Standards
Technologies and Form Factors of Hard Drives
Interface Standards Used by Hard Drives
How to Select and Install Hard Drives
Selecting a Hard Drive
Steps to Install a SATA Drive
Installing a Drive in a Removable Bay
Installing a Small Drive in a Wide Bay
Installing An M.2 SSD Card
Installing a Hard Drive in a Laptop
Setting Up Hardware RAID
Troubleshooting Hard Drives
Slow Performance
RAID Audible Alarms
Missing Array
Hard Drive Problems During the Boot
Supporting Other Types of Storage Devices
File Systems Used by Storage Devices
Standards Used by Optical Discs and Drives
Solid-State Storage
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 6. Supporting I/O Devices
Introduction
Basic Principles for Supporting I/O Devices
Wired and Wireless Connection Standards Used by Peripheral Devices
Connectors and Ports Used by Peripheral Devices
Identifying and Installing I/O Peripheral Devices
Mouse or Keyboard
Webcams
Graphics Tablets
Installing and Configuring Adapter Cards
Sound Cards and Onboard Sound
Capture Cards
Replacing Expansion Cards in a Laptop
Supporting the Video Subsystem
Monitor Technologies and Features
Changing Monitor Settings
Troubleshooting I/O Devices
Num Lock Indicator Light
Device Manager
Audio Issues
Troubleshooting Video, Monitors, and Projectors
Video System in a Laptop
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 7. Networking Fundamentals
Introduction
Understanding TCP/IP and Windows Networking
Addresses Used on a Network
TCP/IP Model for Network Communication
The OSI Model for Network Communication
Server Applications, Their Protocols, and Their Ports
TCP and UDP Delivery Methods
How Computers Find Each Other
How IPv6 Addresses Are Used
Network Hardware
Network Adapters
Switches and Hubs
Cable Modem
Multifunction SOHO Router
Local Network Setup and Configuration
Installing and Configuring a SOHO Router
Connecting a Computer to a Local Network
Configure TCP/IP Settings
Alternate IP Address Configuration
DNS Configuration Basics
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 8. Network Infrastructure and Cloud Computing
Introduction
Types of Networks and Network Connections
Internet Connection Technologies
Identifying Network Hardware and Infrastructure
Switches and Virtual LANs
Wireless Access Points
Ethernet Cables and Connectors
Power over Ethernet (PoE)
Internet of Things (IoT)
Devices and Software to Enhance Networking
Configuring Network Infrastructure
Designing a Wired Network
Tools Used by Network Technicians
How Twisted-Pair Cables and Connectors Are Wired
Wi-Fi Networking
Troubleshooting Network Connections
Limited or Slow Wired Connectivity
Port Flapping
Network Jitter and High Latency
VoIP Call Quality
Intermittent Wireless Connectivity and External Interference
Authentication Failures
Intermittent Internet Connectivity
Client-Side Virtualization
Setting Up Client-Side Virtualization
Securing a Virtual Machine
Containers
Cloud Computing
Deployment Models for Cloud Computing
Characteristics of Cloud Computing
Cloud Computing Service Models
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 9. Supporting Mobile Devices
Introduction
Mobile Devices, Operating Systems, Connections, and Accessories
Mobile Device Operating Systems
Get to Know an Android Device
Get to Know iOS and iPadOS by Apple
Wireless Connections for Mobile Devices
Mobile Device Ports and Accessories
Mobile Apps for Business Use
Mobile Devices Managed by Corporate Policies
Configure Mobile Device Email
Mobile Device Synchronization
Troubleshooting Mobile Devices
Troubleshooting Techniques
Common Mobile Device Malware Symptoms
Mobile Device Malware Removal
Other Common Problems and Solutions
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Chapter 10. Supporting Printers
Introduction
Printer Types and Features
Scanners
Laser Printers
Laser Printing Steps
Inkjet Printers
Impact Printers
Thermal Printers
Using Windows to Install, Share, and Manage Printers
Local or Network Printer
Wired or Wireless Printer Connections
Installing a Local or Network Printer
Choosing a Driver
Sharing a Printer on a Network
Network Scan Services
Configuring Printer Features and Add-On Devices
Printer Maintenance
Online Support for Printers
Cleaning a Printer
Calibrating a Printer
Printer Maintenance Kits
Troubleshooting Printers
Printer Does Not Print
Poor Print Quality
Chapter Summary
Key Terms
Thinking Critically
Hands-On Projects
Real Problems, Real Solutions
Show more

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