CompTIA A+ Domain Deep Dive (Core 1 & Core 2)

CompTIA A+ Domain Deep Dive: Core 1 and Core 2

The CompTIA A+ certification is earned by passing two separate exams: Core 1 (exam code 220-1101) and Core 2 (exam code 220-1102). Each exam covers distinct but complementary domains. Mastering both sets of domains—and being able to demonstrate that mastery under timed, exam-like conditions—is the goal of this lesson.

What the Exams Cover

Core 1 (220-1101) focuses on the physical and foundational side of IT:

• Mobile Devices – laptop hardware, display components, mobile device types, accessories, and network connectivity.
• Networking – ports and protocols, networking hardware, wireless standards, SOHO network configuration.
• Hardware – cables, connectors, RAM types, storage devices, motherboard components, power supplies, printers.
• Virtualization and Cloud Computing – hypervisor types (Type 1 and Type 2), cloud service models (IaaS, PaaS, SaaS), cloud deployment models.
• Hardware and Network Troubleshooting – systematic troubleshooting methodology, common POST error codes, printer issues, and network connectivity problems.

Core 2 (220-1102) focuses on software, security, and professional practice:

• Operating Systems – Windows editions and features, macOS, Linux, mobile OS types, command-line tools, disk management.
• Security – malware types, physical security, logical security concepts, wireless security protocols, data destruction methods.
• Software Troubleshooting – troubleshooting Windows, mobile devices, and malware removal procedures.
• Operational Procedures – documentation, change management, disaster recovery, scripting basics, environmental impacts, communication professionalism, and safety procedures.

Safety in the IT Environment

Operational Procedures on Core 2 includes workplace safety—and these topics appear on the real exam. Know them cold:

• Electrostatic Discharge (ESD): Always use an anti-static wrist strap connected to a grounded point when handling circuit boards, RAM, or CPUs. Store components in anti-static bags.
• Electrical Hazards: Never open a power supply unit (PSU) or CRT monitor—internal capacitors can hold lethal charge even when unpowered. Tag and lock out power before servicing equipment connected to building circuits (lockout/tagout, LOTO).
• Chemical Safety: Toner is a fine particulate; use a toner-rated vacuum (not a standard shop vac) when cleaning laser printers. Consult the Safety Data Sheet (SDS) for any chemical—compressed air cans, cleaning solvents, or battery materials.
• Physical Safety: Lift heavy equipment with your legs, not your back. Use a cable management plan to prevent trip hazards in the lab and on the job.
• Proper Disposal: Batteries, toner cartridges, and electronics must follow local regulations and manufacturer guidelines—never ordinary trash.

These safety points are testable on Core 2 and reflect real workplace requirements.

The CompTIA Troubleshooting Methodology

CompTIA publishes a specific six-step troubleshooting methodology that appears repeatedly on both exams:

1. Identify the problem.

2. Establish a theory of probable cause (question the obvious).

3. Test the theory to determine cause.

4. Establish a plan of action to resolve the problem and implement the solution.

5. Verify full system functionality and, if applicable, implement preventive measures.

6. Document findings, actions, and outcomes.

Memorize these six steps in order. Performance-based questions (PBQs) may ask you to place steps in sequence or select the next correct action in a scenario.

How the Exams Are Structured

Each exam contains a maximum of 90 questions and must be completed within 90 minutes. Question types include multiple-choice (single and multiple correct answer) and performance-based questions (PBQs). PBQs simulate real tasks—drag-and-drop cable matching, virtual network configuration, or ordering troubleshooting steps. They appear early in the exam and take more time; budget accordingly.

CompTIA scores exams on a scale of 100–900. The published passing score for both Core 1 and Core 2 is 675. This is the target you must meet on two consecutive full-length simulated exams before your instructor signs off.

Strategy for Timed Practice

Track by domain, not just total score. A passing total can hide a failing domain. Use your tracking spreadsheet to record your percentage correct in every domain after every practice attempt. Any domain below 70% gets remediation before your next full-length attempt.

Simulate real conditions. Set your exam-simulation software to 90 questions and 90 minutes. Sit at a clean desk. Do not pause. This builds the pacing instinct you need on test day.

Use the CompTIA Exam Objectives document. It is free at comptia.org and lists every testable objective by number (for example, 2.4 – Given a scenario, use the appropriate Microsoft Windows 10 features). When you miss a question, find its objective number and log it in your remediation log.

Teach it back. Research consistently shows that explaining a concept to someone else is one of the most effective ways to move information into long-term memory. The peer whiteboard review in today's activity is not optional—it is a proven study technique.

Quick-Recall Station Tips

During station rotations you will physically handle hardware. As you do, narrate the component: its name, its connector type, its function, and one common failure symptom. This multi-sensory approach helps you answer PBQs faster because recognition becomes automatic rather than effortful.

By the end of this lesson, you will have practiced every A+ domain under time pressure, identified your personal weak areas by objective number, and begun targeted remediation—leaving you ready to sit the real exams with confidence.