The CompTIA A+ is the industry standard entry-level IT certification that validates your ability to troubleshoot, repair, and maintain computers and networks. It's recognized by employers worldwide and opens doors to roles like Help Desk technician, desktop support specialist, and junior IT administrator. Unlike vendor-specific certifications, A+ covers foundational IT skills you'll use regardless of which company or technology you work with.
If you're starting an IT career or transitioning from another field, CompTIA A+ is the logical first step. It's comprehensive, respected, and genuinely teaches practical skills. The certification requires passing two separate exams: Core 1 (220-1201) and Core 2 (220-1202).
Exam Overview
| Detail | Value |
|---|---|
| Exam codes | Core 1 (220-1201), Core 2 (220-1202) |
| Questions | Up to 90 per exam |
| Time limit | 90 minutes per exam |
| Passing scores | Core 1: 675 out of 900, Core 2: 700 out of 900 |
| Question format | Multiple choice and drag-and-drop |
| Exam cost | $220 USD per exam (varies by region) |
| Validity | 3 years from certification date |
| Prerequisites | None, but hands-on experience with computers is helpful |
The two-exam structure gives you flexibility. You can take them back-to-back or space them out. CompTIA allows up to three years to complete both, though most people pass both within a few weeks of studying.
Exam Domains
| Domain | Core 1 Weight | Core 2 Weight |
|---|---|---|
| Hardware | 13% | - |
| Networking | 11% | - |
| Mobile devices | 7% | - |
| Virtualization and cloud computing | 5% | - |
| Hardware and network troubleshooting | 14% | - |
| Operating systems | - | 14% |
| Security | - | 14% |
| Software troubleshooting | - | 11% |
| Operational procedures | - | 10% |
Core 1 tests hardware and networking fundamentals. Core 2 tests operating systems, security, and troubleshooting. Together, they ensure you can handle real IT support scenarios.
Core Services and Concepts to Master
Hardware Fundamentals
You need hands-on familiarity with computer components:
- CPU, RAM, motherboards — know form factors, speeds, compatibility. DDR4 vs DDR5 matters. AM5 vs LGA1700 socket differences are tested.
- Storage devices — SSDs vs hard drives, NVMe vs SATA, RAID configurations. Understand speed trade-offs and when to use each.
- Power supplies — modular vs non-modular, wattage sizing, 80+ certification levels.
- Expansion cards — graphics cards, network adapters, sound cards. Know PCI Express basics.
- Cooling solutions — air vs liquid cooling, fan mounting, thermal paste application.
Networking Essentials
Networking questions focus on practical troubleshooting:
- TCP/IP basics — OSI model layers, IPv4 vs IPv6, CIDR notation. Know common ports: HTTP (80), HTTPS (443), SMTP (25), DNS (53), DHCP (67-68).
- Network hardware — routers, switches, modems, access points. Understand what each does and how they connect.
- Wireless protocols — 802.11a/b/g/n/ac/ax standards, frequencies, security (WEP, WPA, WPA2, WPA3).
- Troubleshooting tools — ping, ipconfig/ifconfig, nslookup, tracert, netstat. Know what each command reveals.
- Ethernet standards — Cat5e, Cat6, Cat7, and the distance limitations of each.
Operating Systems
Windows, macOS, and Linux appear on both exams:
- Windows basics — installation, user management, file systems (NTFS, FAT32), permissions, Group Policy basics.
- Command line — cmd.exe and PowerShell basics. Commands like ipconfig, systeminfo, disk management utilities.
- macOS and Linux — basic file structures, terminal commands, user permissions. Doesn't require deep expertise, just fundamentals.
- System utilities — Task Manager, Resource Monitor, Device Manager. Know how to identify bottlenecks and errors.
Security Practices
Security is heavily weighted on Core 2:
- Authentication — password policies, biometrics, multi-factor authentication (MFA). Know best practices for creating secure policies.
- Encryption — symmetric vs asymmetric, common protocols (HTTPS, SSH). Understand what you're encrypting and why.
- Physical security — BIOS/UEFI settings, secure boot, TPM, cable locks. These prevent hardware theft and tampering.
- Malware types — viruses, worms, trojans, ransomware, spyware. Know the difference and removal strategies.
- Firewalls and antivirus — what they protect against, when they're necessary, how to configure basic rules.
Troubleshooting Methodology
Core 1 includes a dedicated troubleshooting domain:
- Identify the problem — ask the user what happened, what they've already tried, what changed recently.
- Research and establish theory of probable cause — don't jump to conclusions. Is it hardware or software. Is it recent or longstanding.
- Test the theory — perform a simple test first before complex changes. Reboot before replacing components.
- Establish a plan of action — don't make changes randomly. Fix one thing at a time so you know what worked.
- Verify functionality and implement preventive measures — confirm the fix resolves the issue. Update documentation for the next tech.
- Document findings — write down what the problem was, how you fixed it, and how long it took.
Common Exam Traps
Confusing hardware generations. A+ tests specific CPU, RAM, and SSD standards. Know DDR4 vs DDR5 specifications and compatibility. A mismatched motherboard and RAM is a common trap question.
Misremembering default ports. Port numbers are heavily tested. HTTP is 80, HTTPS is 443, SMTP is 25. If you guess wrong, you'll fail related questions.
Assuming physical security is obvious. Cable locks, BIOS passwords, and Trusted Platform Module (TPM) questions trip up many candidates because they seem simple but require specific knowledge.
Overthinking troubleshooting steps. The troubleshooting methodology is straightforward. Always identify the problem first, research causes, test a simple theory, then make changes. Don't skip steps.
Forgetting mobile device specifics. Core 1 includes iOS and Android. Know basic MDM (Mobile Device Management), app installation, mobile malware risks, and connectivity options.
Mixing up Linux vs macOS commands. Both appear on the exam. Linux uses apt/yum for package management; macOS uses Homebrew. Know the differences.
Study Plan
| Timeframe | Focus |
|---|---|
| Week 1 | Hardware: CPUs, RAM, storage, power supplies, cooling, expansion cards |
| Week 2 | Networking: OSI model, TCP/IP, routers, switches, wireless protocols |
| Week 3 | Hardware troubleshooting: using diagnostic tools, common hardware failures |
| Week 4 | Mobile devices: iOS and Android basics, MDM, mobile security |
| Week 5 | Windows and macOS operating systems: installation, user management, file permissions |
| Week 6 | Linux and operating system security: basic commands, authentication, encryption |
| Week 7 | Software troubleshooting: application crashes, malware removal, driver updates |
| Week 8 | Operational procedures: ticketing, documentation, change management, backup strategies |
| Week 9 | Security in depth: physical security, access control, firewalls, antivirus |
| Week 10 | Core 1 mock exams and weak domains |
| Week 11 | Retake failing Core 1 domain areas |
| Week 12 | Take Core 1 exam (or continue studying if not ready) |
| Week 13-22 | Repeat for Core 2 (same structure, different domains) |
Adjust this timeline based on your background. If you have hands-on IT experience, compress weeks 1-4 and spend more time on security and troubleshooting. If you're brand new to IT, take extra time on hardware and networking basics.
Recommended Resources
- CompTIA official study materials — the A+ certification page links to the exam objectives and official study guide.
- Hands-on practice — build a computer, install Windows and Linux, set up a home network. The exam tests practical skills.
- YouTube channels — Professor Messer is the go-to free resource for CompTIA exams. His A+ series covers every domain in detail.
- Practice exams — our A+ practice sets give you realistic scenarios and instant feedback on every question.
- Official CompTIA learning paths — use the CompTIA training resources to supplement your studying.
Final Thoughts
CompTIA A+ is achievable in 3 to 6 months if you study consistently. The key is hands-on experience. Don't just memorize facts. Actually work with computers, networks, and operating systems. Troubleshoot real problems. The exam rewards people who understand why things work, not just what they're called.
Start with Core 1. It covers the foundational hardware and networking knowledge you'll need for Core 2 and any advanced certification. Once you pass Core 1, Core 2 becomes easier because you already understand how systems fit together.
Ready to test your knowledge? Try our A+ practice exams and see where you stand.