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CompTIA A+ Exam Objectives Explained (2026 Domain Guide)
Quick Answer
CompTIA A+ is split across two exams. Core 1 covers mobile devices, networking, hardware, virtualization and cloud, and hardware/network troubleshooting. Core 2 covers operating systems, security, software troubleshooting, and operational procedures. Nine domains total, each weighted differently, and you must pass both exams to earn the certification. Always download the current objectives PDF from CompTIA before you start — it is the literal blueprint your exam is written from.
- Exams Required
- 2 (Core 1 + Core 2)
- Total Domains
- 9
- Heaviest Domain
- Hardware (Core 1)
- Typical Study Time
- 2-3 Months
On this page
The CompTIA A+ objectives document is the single most underused study resource in IT certification. It is free, it is published by the people who write the exam, and it lists — bullet by bullet — every technology, term, and task you can be tested on. Candidates who fail almost always studied a course or a book instead of the objectives. Candidates who pass use the objectives as a checklist and the course as the explanation. This guide walks through every A+ domain across both Core exams in 2026, explains what each one is really testing, tells you how heavily it is weighted, and gives you a study order that stops you from burning three weeks on printers while ignoring troubleshooting. Read it once end to end, then keep it open next to whatever course you are working through.
Core 1 Domains: What Each One Tests
Core 1 is the hardware and infrastructure half of A+. It is the exam most people take first, and it is where performance-based questions tend to feel the most physical — identifying connectors, choosing the right RAM, laying out a small network.
Mobile Devices
The smallest domain by weight, and the one most candidates over-study. You need laptop hardware replacement (display assemblies, batteries, keyboards, storage), display component identification, accessories and ports, and mobile device network connectivity and synchronization. Expect questions about configuring email on a phone, enabling hotspot and tethering, and the difference between synchronization methods. Learn the physical replacement steps and the settings paths; skip the deep telecom theory.
Networking
Ports and protocols is the single highest-yield memorization block in all of A+. Know the common port numbers cold, along with TCP versus UDP for each. Beyond that: networking hardware (routers, switches, access points, firewalls, patch panels, PoE), wireless standards and frequencies, network services (DHCP, DNS, file and print servers), IPv4 addressing including private ranges, APIPA, and subnet basics, and common network types. If you can build a small office network on paper, you are ready for this domain.
Hardware
The largest domain on Core 1. Cables and connectors, RAM types and configurations, storage devices including drive form factors and RAID levels, motherboards and expansion cards, CPUs and cooling, power supplies and wattage calculation, multifunction printer setup and consumables. Printers alone account for a surprising number of questions — laser imaging process order, thermal and inkjet consumables, print sharing. This domain rewards flashcards and hands-on time equally.
Virtualization and Cloud Computing
A light domain conceptually but easy to lose points on because most candidates skim it. Cloud service models and deployment models, shared resources, measured service and rapid elasticity, virtual desktop infrastructure, and client-side virtualization requirements including resource, security, and network prerequisites. Understand why an organization would choose one model over another — the questions are scenario-driven.
Hardware and Network Troubleshooting
The second-heaviest Core 1 domain and the one that decides pass or fail for most people. It applies everything above through the CompTIA troubleshooting methodology: identify the problem, establish a theory, test the theory, establish a plan, verify functionality, document. Expect symptoms — no POST, intermittent shutdowns, distorted display output, drive not detected, intermittent wireless, printer output defects — and you must select the most likely cause or the correct next step. Practice reading the question for what stage of troubleshooting is being asked about.
Core 2 Domains: What Each One Tests
Core 2 is the software, security, and process half. It is generally considered the easier exam by people with a helpdesk background and the harder exam by people who built PCs as a hobby, because it is far more procedural.
Operating Systems
The largest Core 2 domain. Windows editions and feature differences, command-line tools, Control Panel and Settings utilities, system utilities such as task manager, disk management, and event viewer, networking configuration on a workstation, application installation requirements, OS installation and upgrade methods including partition and file system choices, plus working knowledge of macOS, Linux, and mobile operating systems. Memorize command-line switches — they show up constantly.
Security
Physical and logical security controls, wireless security protocols and authentication, malware types and removal procedures in the correct order, social engineering attacks, threats and vulnerabilities, Windows workstation security settings and best practices, mobile device security, and data destruction and disposal methods. The malware removal steps must be memorized in sequence — order-of-operations questions are common.
Software Troubleshooting
Applying the troubleshooting methodology to Windows problems, application crashes, boot failures, mobile OS and application issues, and security symptoms such as browser redirects, certificate warnings, and pop-ups. The pattern is the same as hardware troubleshooting: identify the symptom, pick the least invasive correct next step.
Operational Procedures
The domain candidates dismiss and then lose points on. Documentation and change management, backup methods and the 3-2-1 approach, safety procedures including ESD and electrical safety, environmental controls and material safety data sheets, prohibited content and privacy handling, professional communication and incident response, basic scripting concepts, and remote access technologies. It is pure reading — one focused evening covers it.
How Domain Weighting Should Change Your Study Plan
Every objectives PDF lists a percentage next to each domain. That percentage is the share of scored questions drawn from that domain, and it is the most actionable number in the document.
The practical rule: allocate study hours roughly in proportion to weighting, then add a bonus block for troubleshooting on both exams. On Core 1, hardware and troubleshooting together dominate the exam; mobile devices and virtualization are comparatively small. On Core 2, operating systems and security carry the most weight, with software troubleshooting close behind.
What this means in practice is that spending equal time on all nine domains is a mistake. A candidate who is excellent at printers and shaky at troubleshooting methodology will fail. A candidate who is average across the heavy domains and merely competent on the light ones will pass comfortably.
One caveat: weighting tells you how many questions come from a domain, not how hard they are. Virtualization is a small domain, but the questions are conceptual and easy to miss if you never read it. Cover everything at least once — just do not spend equal time on everything.
How to Turn the Objectives Into an Actual Study System
Download the current objectives PDF for both Core exams directly from CompTIA. Do not rely on a summarized version from a course provider, and do not use an objectives file you found on a forum — CompTIA revises the exams periodically and an outdated blueprint will send you studying retired technology.
Then convert the document into a checklist. Every sub-bullet becomes one line with three states: never seen it, seen it, can explain it to someone else. That third state is the bar. If you cannot explain a bullet out loud without notes, it is not learned.
Work in domain order within each Core exam, but front-load the heaviest domains while your motivation is highest. After each domain, run a practice set restricted to that topic and mark every miss back against the specific objective bullet it came from. That mapping — miss to bullet — is what turns practice questions from a score into a study plan.
In the final week, stop consuming new material entirely. Re-read the objectives list top to bottom and flag anything that does not immediately produce a mental explanation. That short list is your only remaining homework.
Step-by-Step Guide
Download the current objectives for both Core exams
Get the PDFs from CompTIA directly. Confirm you are on the current version — a superseded blueprint is worse than no blueprint because it creates false confidence.
Save both files locally and print the domain summary page. You will reference it dozens of times.
Convert every sub-bullet into a checklist line
A spreadsheet works fine. One row per bullet, one column for domain, one for confidence level. This becomes your progress tracker for the entire study period.
Track confidence as never-seen / seen / can-explain rather than a percentage. Binary-ish states are easier to be honest about.
Study heaviest domains first
Hardware and troubleshooting on Core 1; operating systems and security on Core 2. Early momentum on the domains that carry the most questions protects you if life shortens your study window.
Book your exam date once the heaviest domain is complete. A real deadline stops indefinite studying.
Run domain-restricted practice sets after each domain
Do not wait until the end to test yourself. Immediately after finishing a domain, answer questions from only that domain so misses are attributable.
Map every wrong answer back to the exact objective bullet, not just the domain.
Finish with full-length mixed practice exams
Once every domain is at can-explain level, switch to timed full-length exams that mix all domains and include performance-based style questions.
Consistent scores in the mid-eighties across two or three different question sources is a far better readiness signal than one high score.
Expert Insight
The most reliable predictor of an A+ pass is not hours studied — it is whether the candidate can point to a specific objective bullet for every practice question they missed. That single habit converts passive review into targeted repair, and it is what separates a candidate who plateaus at seventy percent from one who walks in at eighty-five.
Study Tips
The objectives PDF includes an acronym list at the end. It is effectively a free vocabulary exam — work through it line by line.
Anything in the objectives phrased as "given a scenario" will be tested as an applied question, not a definition. Study those bullets by doing, not reading.
Bullets that start with "compare and contrast" almost always become questions where two answers look right. Learn the distinguishing detail, not just the definitions.
Ports and protocols on Core 1 and command-line tools on Core 2 are the two highest return-on-time memorization blocks in the entire certification.
Re-read the objectives the night before each exam instead of cramming new content. It surfaces gaps without adding cognitive load.
Common Mistakes
Studying a video course cover to cover without ever opening the official objectives, then discovering the course skipped bullets.
Using an outdated objectives file, which leads to studying retired technology and missing newly added topics.
Spending equal time on all nine domains regardless of weighting, so the heavy domains never get enough depth.
Treating troubleshooting as something that will emerge from knowing the hardware. It is a separate methodology and it must be practiced deliberately.
Skipping operational procedures on Core 2 because it looks like filler. It is easy points that candidates routinely give away.
Frequently Asked Questions
How many domains are on the CompTIA A+ exam?
Nine in total across two exams. Core 1 has five domains: mobile devices, networking, hardware, virtualization and cloud computing, and hardware and network troubleshooting. Core 2 has four: operating systems, security, software troubleshooting, and operational procedures.
Where do I download the official A+ objectives?
From CompTIA directly. Each Core exam has its own objectives PDF, and CompTIA publishes the current version alongside the exam details. Avoid third-party copies, which are frequently outdated.
Which A+ domain is weighted the heaviest?
On Core 1, hardware carries the largest share of questions, with troubleshooting close behind. On Core 2, operating systems is the heaviest, followed by security. Check the current objectives PDF for the exact percentages, since CompTIA adjusts them between versions.
Do I need to memorize the objectives word for word?
No. You need to be able to explain every bullet in your own words and perform the tasks described in the "given a scenario" bullets. Verbatim memorization of the document itself provides no benefit.
Can I pass A+ by studying only the objectives list?
Not on its own. The objectives tell you what is tested, not how any of it works. Use the objectives as your checklist and a course, book, or hands-on practice as the explanation layer.
Do the objectives change between exam versions?
Yes. CompTIA revises the A+ exams periodically, adding current technology and retiring obsolete topics. When a new version launches there is usually an overlap window when both are available, so confirm which version your exam voucher applies to.
How do I know when I have covered every objective?
Work through your checklist and confirm each bullet is at the "can explain without notes" level, then verify with domain-restricted practice questions. If a domain consistently scores below the rest, that domain has uncovered bullets in it.
Practice A+ questions mapped to every domain
Work through adaptive questions across all nine A+ domains, see exactly which objectives you are weak in, and fix them before exam day.
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