CompTIA A+
TEXTBOOK
–
EXPANSION
(Chapters
6–12)
Theme A • Professional Spacing • High‑Readability • Multi‑Page Textbook Sections
CHAPTER 6 — Operating Systems Deep Dive
6.1 Windows Architecture
Windows uses a hybrid kernel with subsystem models that support Win32, .NET,
POSIX, and UWP frameworks.
Core boot components include UEFI firmware → Windows Boot Manager → Winload →
Kernel init.
Registry structure: HKLM controls hardware + drivers; HKCU stores profile‑specific
settings.
6.2 System Utilities & Diagnostics
Event Viewer logs: System, Application, Security—critical for diagnosing crashes and
service failures.
MSConfig controls startup, boot parameters, and safe‑mode toggles.
DISM repairs OS component stores, SFC repairs system files.
6.3 macOS & Linux
macOS uses a Darwin UNIX base with launchd for service management.
Linux distributions differ in package managers (APT, DNF) and service controllers
(systemd).
Review Questions:
CHAPTER 7 — Advanced Security Concepts
7.1 Threat Types & Behaviors
Ransomware encrypts user data and often exfiltrates files before demanding
payment.
Rootkits hide malicious processes by altering kernel‑level calls.
7.2 Authentication & Access Control
Multi‑Factor Authentication includes knowledge, possession, and biometric factors.
RBAC assigns permissions based on job roles, minimizing privilege exposure.
7.3 Hardening Techniques
Least privilege, patch management, disabling unneeded services, and enforcing
password policies.
WPA3 introduces SAE, replacing PSK handshakes with stronger resistance to offline
cracks.
Review Questions:
CHAPTER 8 — Advanced Software
Troubleshooting
8.1 Windows Boot Failures
Startup Repair rebuilds BCD entries and replaces corrupt boot files.
Safe Mode loads minimal drivers—ideal for isolating driver conflicts.
8.2 Application Conflicts
DLL mismatches, corrupted program files, incorrect permissions, and outdated
runtimes often cause crashes.
Log files stored under %ProgramData% or AppData help identify root causes.
Review Questions:
CHAPTER 9 — Advanced Operational
Procedures
9.1 Documentation Standards
Technicians must maintain config baselines, network diagrams, and asset inventories.
Ticketing systems track change logs, approvals, and escalation paths.
9.2 Professional Communications
Active listening, empathy, avoiding jargon, and confirming user statements improve
resolution quality.
Review Questions:
CHAPTER 10 — Networking Troubleshooting
10.1 Connectivity Failures
Common issues: wrong subnet mask, DHCP failures, DNS timeout, duplicate IP
addresses.
Tools: ping, tracert, ipconfig, nslookup, netstat.
10.2 Wireless Faults
Channel overlap, low SNR, AP saturation, incorrect WPA keys, MAC filtering blocks.
Review Questions:
CHAPTER 11 — Hardware Assembly
Walkthrough
11.1 Step‑by‑Step PC Build
Install CPU → apply thermal paste → mount cooler → insert RAM → mount motherboard
→ connect PSU rails.
Cable management ensures airflow and reduces component wear.
11.2 Testing & Verification
POST checks, BIOS configuration, boot device ordering, driver installation.
Review Questions:
CHAPTER 12 — PBQ Simulation Training
12.1 OS Troubleshooting PBQ
User cannot authenticate: check domain connectivity, reset password, check lockout
policy.
12.2 Network PBQ
Diagnose IP conflict: compare ipconfig outputs, reserve addresses in DHCP, adjust
router config.
Review Questions:
END OF EXPANDED CHAPTERS (NEXT: FULL 100+ PAGE GENERATION)