5. Glossary

This section is based on the official acronym list from the CompTIA A+ Core 1 (220-1201) exam objectives document.

• AAA: Authentication, Authorization, and Accounting
• AC: Alternating Current
• ADF: Automatic Document Feeder
• AP: Access Point
• APIPA: Automatic Private IP Addressing
• ARM: Advanced RISC Machine
• ATX: Advanced Technology Extended
• BIOS: Basic Input/Output System
• BYOD: Bring Your Own Device
• CIFS: Common Internet File System
• CPU: Central Processing Unit
• DDR: Double Data Rate
• DHCP: Dynamic Host Configuration Protocol
• DIMM: Dual In-line Memory Module
• DNS: Domain Name System
• DSL: Digital Subscriber Line
• DVI: Digital Visual Interface
• ECC: Error-Correcting Code
• eSIM: Embedded Subscriber Identity Module
• GPS: Global Positioning System
• HDD: Hard Disk Drive
• HDMI: High-definition Multimedia Interface
• IaaS: Infrastructure as a Service
• IMAP: Internet Mail Access Protocol
• IOPS: Input/Output Operations Per Second
• IoT: Internet of Things
• IP: Internet Protocol
• IPS: In-plane Switching
• ITX: Information Technology eXtended
• LAN: Local Area Network
• LCD: Liquid Crystal Display
• LDAP: Lightweight Directory Access Protocol
• MAC: Media Access Control
• MDM: Mobile Device Management
• NFC: Near-field Communication
• NIC: Network Interface Card
• NVMe: Non-volatile Memory Express
• OLED: Organic Light-emitting Diode
• PaaS: Platform as a Service
• PAN: Personal Area Network
• PCIe: Peripheral Component Interconnect Express
• PIN: Personal Identification Number
• PoE: Power over Ethernet
• POP3: Post Office Protocol 3
• POST: Power-on Self-test
• PSU: Power Supply Unit
• RAID: Redundant Array of Independent Disks
• RAM: Random-access Memory
• RDP: Remote Desktop Protocol
• RFID: Radio-frequency Identification
• RJ-11: Registered Jack 11
• RJ-45: Registered Jack 45
• SaaS: Software as a Service
• SATA: Serial Advanced Technology Attachment
• SIM: Subscriber Identity Module
• S.M.A.R.T.: Self-monitoring Analysis and Reporting Technology
• SMB: Server Message Block
• SMTP: Simple Mail Transfer Protocol
• SODIMM: Small Outline Dual In-line Memory Module
• SOHO: Small Office/Home Office
• SSD: Solid-state Drive
• SSH: Secure Shell
• SSID: Service Set Identifier
• TCP: Transmission Control Protocol
• TN: Twisted Nematic
• TPM: Trusted Platform Module
• UDP: User Datagram Protocol
• UEFI: Unified Extensible Firmware Interface
• UPS: Uninterruptible Power Supply
• USB: Universal Serial Bus
• UTM: Unified Threat Management
• VDI: Virtual Desktop Infrastructure
• VGA: Video Graphics Array
• VLAN: Virtual LAN
• VM: Virtual Machine
• VoIP: Voice over Internet Protocol
• VPN: Virtual Private Network
• WAN: Wide Area Network
• WLAN: Wireless LAN
• WPA: Wi-Fi Protected Access
• WPS: Wi-Fi Protected Setup