100 CompTIA A+ Terms You Need to Know Before Exam Day

Watch: A+ 100 Terms

Build your vocabulary before diving into practice questions. This video covers the most important terms — explained clearly, no fluff.

Hardware Fundamentals

1. CPU (Central Processing Unit) — The primary processor executing instructions and performing calculations. Understanding CPU types, sockets, and cooling is core to A+ hardware knowledge.

2. RAM (Random Access Memory) — Temporary, volatile memory used by the CPU to store data for active processes. More RAM enables better multitasking performance.

3. Motherboard — The main circuit board connecting all computer components. Contains the CPU socket, RAM slots, expansion slots, and connectors for storage and peripherals.

4. BIOS/UEFI — The firmware initializing hardware at startup and loading the operating system. BIOS is older; UEFI is the modern standard.

5. POST (Power-On Self-Test) — The diagnostic process run by BIOS/UEFI at startup, checking hardware functionality before loading the OS.

6. Form Factor — The physical size and shape specification of components. ATX, Micro-ATX, and Mini-ITX are common motherboard form factors.

7. Expansion Slot — A slot on the motherboard for adding components. PCIe (PCI Express) is the current standard, used for GPUs, SSDs, and network cards.

8. GPU (Graphics Processing Unit) — A processor specialized for rendering graphics. Also used for AI/ML workloads; can be integrated or discrete.

9. Storage Device — Hardware storing data persistently. HDDs (hard disk drives), SSDs (solid-state drives), and NVMe drives are tested on A+.

10. HDD (Hard Disk Drive) — A magnetic storage device using spinning platters. Slower than SSDs but cost-effective for high-capacity storage.

11. SSD (Solid-State Drive) — Storage using flash memory with no moving parts. Faster, more durable, and more power-efficient than HDDs.

12. NVMe (Non-Volatile Memory Express) — A high-speed storage interface for SSDs using the PCIe bus. Significantly faster than SATA-based SSDs.

13. SATA (Serial ATA) — The standard interface for hard drives and SSDs. Limited to ~550 MB/s; being replaced by NVMe.

14. Power Supply Unit (PSU) — Converts AC power from the wall to the DC voltages required by components. Understanding wattage and connectors is critical.

15. Thermal Paste — A heat-conducting compound applied between a CPU and heatsink. Critical for proper cooling.

16. Heatsink & Fan — Hardware cooling CPUs and GPUs. Air cooling uses fans; liquid cooling uses water for better heat transfer.

17. Case / Chassis — The metal enclosure housing computer components. Provides structure and airflow for cooling.

18. CMOS Battery — A small battery maintaining BIOS settings and system clock when powered off. Failure causes date/time errors.

19. BIOS Setup — The configuration utility accessed during startup. Allows changing boot order, enabling features, and overclocking.

20. Firmware — Software embedded in hardware providing low-level control. BIOS/UEFI, device drivers, and hardware controllers contain firmware.

Networking & Internet

21. IP Address — A numerical label assigned to devices on a network. IPv4 uses four octets (192.168.1.1); IPv6 uses hexadecimal notation.

22. Subnet Mask — Defines which portion of an IP address is the network vs. the host. 255.255.255.0 (/24) is the most common.

23. Default Gateway — The router address devices use to send traffic outside their local network. Essential configuration element.

24. DNS (Domain Name System) — Translates domain names to IP addresses. Configuring DNS is a fundamental networking task.

25. DHCP (Dynamic Host Configuration Protocol) — Automatically assigns IP addresses and network settings to devices. Reduces manual configuration.

26. Router — A network device forwarding data packets between networks. The gateway between local networks and the internet.

27. Switch — A network device connecting devices within a LAN using MAC addresses. More efficient than hubs.

28. Wireless Access Point (WAP) — A device connecting wireless clients to a wired network. Understanding 802.11 standards (a/b/g/n/ac/ax) is tested on A+.

29. Ethernet — The most widely used wired networking standard. A+ covers cable types (Cat5e, Cat6, Cat6a), connectors (RJ-45), and speeds.

30. TCP/IP — The foundational internet protocol suite. TCP provides reliable delivery; IP handles addressing and routing.

31. VPN (Virtual Private Network) — Encrypts network traffic over a public network, creating a secure tunnel. Essential for remote access security.

32. Firewall — A security device or software controlling network traffic. First line of defense for any network.

33. NAT (Network Address Translation) — Maps private IP addresses to a public IP for internet communication. Enables multiple devices to share one public IP.

34. MAC Address — A unique hardware identifier for network interface cards. Used for Layer 2 communication on local networks.

35. 802.11 — The IEEE wireless networking standard family. A+ covers the different standards and their speeds, frequencies, and ranges.

36. Wi-Fi Channel — A specific frequency range within a Wi-Fi band. Non-overlapping channels (1, 6, 11 in 2.4 GHz) reduce interference.

37. Bandwidth — The maximum data transfer rate of a connection. Measured in bits per second (bps, Mbps, Gbps).

38. Latency — The time delay between sending and receiving data. Measured in milliseconds; critical for real-time applications.

39. Troubleshooting Network Issues — Using tools like ipconfig, ping, tracert, and netstat to diagnose connectivity problems. Fundamental A+ skill.

40. Port Forwarding — Configuring a router to direct incoming traffic to internal devices. Used to make services accessible from the internet.

Operating Systems

41. Windows OS — Microsoft’s dominant desktop operating system. A+ covers Windows 10 and 11 installation, configuration, and troubleshooting.

42. macOS — Apple’s desktop operating system. A+ includes basic macOS configuration and support tasks.

43. Linux — An open-source OS used in servers and embedded systems. A+ covers basic Linux command-line navigation.

44. File System — How an OS organizes and stores files. NTFS (Windows), APFS (macOS), and ext4 (Linux) are commonly tested.

45. Registry (Windows) — A hierarchical database storing system and application configuration settings. Understanding registry editing is an A+ troubleshooting skill.

46. Task Manager — A Windows utility for monitoring and managing running processes. Essential for troubleshooting performance issues.

47. Device Manager — A Windows tool for viewing, managing, and updating hardware devices and drivers. First stop for hardware troubleshooting.

48. Command Prompt / PowerShell — Windows command-line interfaces for executing commands and scripts. A+ covers common commands like ipconfig, ping, sfc, and chkdsk.

49. Active Directory — Microsoft’s directory service managing users, computers, and policies in enterprise networks. A+ covers basics of domain joining.

50. Group Policy — Windows feature for centrally managing settings across domain-joined computers. Used for security enforcement.

51. User Account Control (UAC) — A Windows security feature prompting for permission before changes requiring admin privileges. Reduces malware impact.

52. File Permissions — Access controls determining who can read, write, and execute files. NTFS permissions and standard Unix permissions differ in approach.

53. OS Installation — Installing an operating system on a computer. A+ covers clean installs, upgrades, and imaging.

54. Boot Process — The sequence of events when a computer powers on. Understand BIOS/UEFI, POST, bootloader, and kernel loading.

55. Safe Mode — A Windows diagnostic startup mode loading only essential drivers. Used to troubleshoot driver conflicts and malware.

56. System Restore — A Windows feature reverting system files to a previous restore point. Used to recover from software changes causing problems.

57. Event Viewer — Windows logging tool recording system, application, and security events. Essential for diagnosing errors and crashes.

58. Disk Management — A Windows utility for managing hard drives, partitions, and volumes. Used for initializing drives and extending partitions.

59. Backup & Recovery — Strategies for protecting data through regular backups. A+ covers full, incremental, and differential backups.

60. Windows Update — The Windows automatic update system for OS and driver updates. Critical for security; A+ covers patch management.

Mobile Devices

61. iOS — Apple’s mobile operating system for iPhones and iPads. A+ covers basic configuration and troubleshooting.

62. Android — Google’s open-source mobile operating system. A+ covers app management, security settings, and troubleshooting.

63. Mobile Device Management (MDM) — Enterprise software for managing and securing mobile devices. A+ covers enrollment, profiles, and remote wipe capabilities.

64. Cloud Synchronization — Keeping data consistent across devices and cloud services. iCloud, Google Drive, and corporate sync solutions.

65. Bluetooth — Short-range wireless technology for connecting peripherals. A+ covers pairing, troubleshooting, and security.

66. NFC (Near-Field Communication) — Very short-range wireless for contactless payments and data transfer. Covered in A+ mobile device topics.

67. Mobile App Installation — Installing applications from app stores or sideloading. A+ covers troubleshooting installation failures.

68. Mobile Security — Protecting mobile devices from malware and unauthorized access. Antivirus, screen locks, and passcodes.

69. Screen Lock Types — PIN, password, fingerprint, and facial recognition. A+ covers each method’s strengths and weaknesses.

70. Factory Reset — Erasing all data and returning a device to default settings. Last resort troubleshooting step for mobile devices.

Virtualization & Cloud

71. Virtualization — Running multiple virtual machines on a single physical host. A+ covers hypervisors, VMs, and common use cases.

72. Hypervisor — Software enabling multiple VMs to run on one host. Type 1 (bare-metal) is faster; Type 2 (hosted) is easier to use.

73. Virtual Machine (VM) — A software emulation of a physical computer with its own OS and applications. Isolated from other VMs on the same host.

74. Cloud Computing — Delivering computing services over the internet. A+ covers IaaS, PaaS, and SaaS service models.

75. SaaS (Software as a Service) — Cloud-delivered software accessed through a browser. Microsoft 365, Google Workspace, and Salesforce are examples.

76. IaaS (Infrastructure as a Service) — Cloud-delivered compute, storage, and networking resources. AWS, Azure, and GCP are examples.

77. PaaS (Platform as a Service) — Cloud-delivered development platforms for building applications. Heroku, App Engine, and Azure App Service.

78. Public Cloud — Cloud services shared among multiple customers and managed by third parties. AWS, Azure, and Google Cloud.

79. Private Cloud — Cloud infrastructure dedicated to a single organization. Greater control but higher costs.

80. Hybrid Cloud — Combining public and private cloud environments that can share workloads. Increasingly common in enterprise deployments.

Printers & Peripherals

81. Laser Printer — Uses a laser beam and toner cartridge for high-quality prints. A+ covers the laser printing process: charging, exposing, developing, transferring, fusing.

82. Inkjet Printer — Sprays tiny ink droplets to create images. A+ covers maintenance, troubleshooting, and print quality issues.

83. Thermal Printer — Uses heat to produce images on special paper. Common in POS systems and label printing.

84. 3D Printer — Creates three-dimensional objects layer by layer. A+ covers basic operation and material types.

85. Print Spooler — A Windows service managing print jobs sent to printers. Common troubleshooting point when printers stop responding.

86. Printer Driver — Software enabling your OS to communicate with a printer. Outdated drivers cause compatibility issues.

87. Network Printer — A printer accessible over a network with its own IP address. Requires network configuration and shared printer setup.

88. Monitor — The display device showing computer output. A+ covers LCD, LED, and OLED technologies.

89. Resolution — The number of pixels displayed on a monitor. 1920×1080 (Full HD) and 2560×1440 (2K) are common resolutions.

90. Refresh Rate — How many times per second a monitor refreshes the image. 60 Hz is standard; 144 Hz is preferred for gaming.

91. Keyboard — Input device with mechanical keys. Mechanical, membrane, and wireless keyboards have different characteristics.

92. Mouse / Trackpad — Pointing input devices. Trackpads are built into laptops; external mice offer better ergonomics.

93. Scanner — A device converting physical documents into digital images. A+ covers scanner setup and troubleshooting.

94. USB Ports — Universal Serial Bus ports for connecting peripherals. USB 2.0, 3.0, 3.1, and USB-C have different speeds and connectors.

95. HDMI / DisplayPort — Video connectors for monitors. HDMI is more universal; DisplayPort is faster.

96. Docking Station — A device allowing laptops to connect to multiple peripherals with a single connection. Common in office environments.

97. Webcam — A camera for video conferencing and recording. Built-in on laptops; external for desktops.

98. Microphone / Speaker — Audio input and output devices. Built-in on most devices; external options offer better quality.

99. Cable Types — Understanding Ethernet, USB, HDMI, power cables, and their specifications. Important for connectivity troubleshooting.

100. CompTIA A+ Certification — The most recognized entry-level IT certification globally. Your foundation for help desk, technical support, and IT careers. Starting point for the cybersecurity career path.

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