CompTIA A+ Core 1 Course

CompTIA A+ Core 1, exam code 220-1101, is the first of two exams required for the A+ certification. It covers PC hardware, networking, mobile devices, virtualization, cloud computing, and hardware and network troubleshooting. The exam uses multiple-choice questions and performance-based questions. Performance-based items ask you to complete a task or solve a scenario instead of choosing one answer. Core 1 focuses on the technology itself, while Core 2 focuses more on operating systems, security, and operational procedures. To prepare, you should learn common ports and cables, memory and storage types, printer technologies, Wi-Fi standards, and basic troubleshooting steps. You should also understand virtualization and cloud service models such as IaaS, PaaS, and SaaS. A structured study plan helps you build knowledge in order and gives you time to practice questions. This course walks you through each domain and links to the practice bank so you can test what you learn.

Core 1 requires a practical understanding of PC hardware. The CPU executes instructions, RAM temporarily stores running programs, and the motherboard connects all components. The power supply converts AC power to the DC voltages used inside the computer. Storage is also important: SSDs use flash memory and have no moving parts, while HDDs use spinning platters. Modern systems often use M.2 SSDs for speed. RAM comes in DIMM modules for desktops and smaller SODIMM modules for laptops. You should also understand RAID levels. RAID 0 stripes data for performance, RAID 1 mirrors data for redundancy, and RAID 5 uses parity. Printers are another hardware topic. Laser printers use toner and heat, while inkjet printers use liquid ink. You should know how to connect and maintain these devices. Knowing the main components, their functions, and common failure signs helps you answer hardware questions and solve practical problems.

Networking questions on Core 1 cover cables, connectors, ports, IP addressing, and wireless networks. Ethernet cables use RJ45 connectors and support a maximum recommended length of about 100 meters. Common ports include HTTP 80, HTTPS 443, DNS 53, and SSH 22. IP addresses identify devices on a network, and subnet masks divide networks into smaller ranges. DHCP automatically assigns IP settings, while DNS translates domain names into IP addresses. A router connects different networks, and a switch forwards frames within the same local network. Wi-Fi standards matter too: 802.11ac commonly uses 5 GHz, and newer standards provide higher speeds. Wireless security should use WPA2 or WPA3 instead of older protocols. The SSID is the network name, and a default gateway is the router used to reach other networks. You should also know basic tools such as ping, which uses ICMP to test connectivity. These fundamentals help you configure and troubleshoot SOHO networks.

Core 1 also covers mobile devices, virtualization, and cloud computing. Mobile devices commonly use lithium-ion batteries and USB-C connectors. Synchronization keeps contacts, calendars, and files consistent across devices. Laptops may use docking stations to add ports, and mobile hotspots share a cellular connection. Virtualization lets one physical host run multiple virtual machines through a hypervisor. Each virtual machine has its own operating system and uses virtual hardware. Cloud computing delivers computing services over the internet. IaaS provides virtual servers and storage, PaaS provides a development platform, and SaaS provides software applications. VDI, or Virtual Desktop Infrastructure, delivers desktop environments from central servers. You should understand the differences between these service models and how virtualization improves resource use. This knowledge appears in both multiple-choice and performance-based questions on the exam.

Troubleshooting is a major part of Core 1. A good process starts with identifying the problem, then establishing a theory of probable cause, testing the theory, and implementing a solution. Finally, you verify the solution and document the outcome. Common hardware issues include startup beeps with no video, which may mean reseating RAM or checking the video cable, and clicking hard drives, which often mean the drive is failing and data should be backed up. Printer jams should be cleared according to the manual. Network issues include missing link lights, which point to cable or port problems, and Wi-Fi failures caused by disabled radios or wrong passwords. A slow computer often improves with more RAM or an SSD. ESD straps protect components from static damage. You should always follow safe practices and avoid replacing parts before checking simple causes. Practice scenarios help you apply this process quickly.