- What the Computer Service Technician Credential Is
- Exam Format and Test-Day Rules
- Fees, Registration, and Remote Proctoring
- The 14 Competency Areas in Detail
- Why Legacy and Current Technologies Both Matter
- Pathways: Standalone, Journeyman, and A+ Rollover
- Who Hires Certified Computer Service Technicians
- Sequencing Your Preparation by Domain
- Keeping the Certification Active for Four Years
- Frequently Asked Questions
- The exam is 80 questions in two hours, proctored theory only, with a 75% passing score and no hands-on assessment.
- The exam fee is USD 80; remote proctoring through ExamRoom.AI adds USD 16, even on a free retake.
- All 14 competency areas are unweighted, so weak spots in any single domain can cost you the pass.
- One free retake is available within one year of your initial session.
What the Computer Service Technician Credential Is
The Computer Service Technician credential, issued by ETA International, verifies that a technician understands the knowledge needed to assemble, configure, maintain, and troubleshoot personal computer systems. It is a theory-based certification: candidates demonstrate knowledge through a proctored written examination rather than by performing repairs in front of an evaluator.
If you are new to the acronym and want the basics before diving into exam mechanics, our explainers on what CST certification is and what CST stands for cover the terminology. This article focuses on the credential itself: how the exam is built, what it costs, which topics it covers, and how to sequence your preparation.
Exam Format and Test-Day Rules
The examination consists of 80 questions to be completed in two hours, which works out to an average of 90 seconds per question. The passing score is 75%, meaning you need at least 60 correct answers out of 80. The exam is a proctored theory examination, and there is no hands-on assessment component. For a deeper look at scoring, see our guide to the CST passing score.
How the exam is delivered
Onsite testing is administered by an ETA Certification Administrator, using either Trapeza online testing or paper and pencil, depending on the site. Remote proctoring is also available through ExamRoom.AI, and it is arranged through ETA rather than booked independently with a third party.
What you can and cannot bring
- Photo ID is required. Plan to present valid identification at check-in.
- Scratch paper is permitted. Any scratch paper you use must be surrendered at the end of the session.
- A non-programmable scientific calculator is permitted. Programmable or graphing models are not appropriate. Expect to use the calculator on topics such as power, resistance, and storage or memory capacity calculations.
Fees, Registration, and Remote Proctoring
The exam fee is USD 80. If you choose remote proctoring through ExamRoom.AI, a separate USD 16 two-hour proctoring fee applies. That proctoring fee also applies when you take your free retake remotely, so budget for it even if the retake itself carries no exam fee. For a fuller breakdown including renewal costs, see our CST certification cost guide.
| Item | Amount | Notes |
|---|---|---|
| Exam fee | USD 80 | Covers the initial examination |
| Remote proctoring (ExamRoom.AI) | USD 16 | Two-hour proctoring fee; applies on the free retake too |
| Free retake | No exam fee | One retake within one year of the initial session |
| A+ rollover route | USD 80 | Separate route for holders of a valid A+ (ce) |
| Annual maintenance | USD 25 per year | USD 100 per four-year cycle |
The free retake window is generous but not unlimited: it must be used within one year of your initial examination session. If your first attempt falls short, use the intervening time to target the domains where you were weakest rather than rushing back in. Our CST exam dates and scheduling guide explains how to plan around testing availability, and our CST requirements overview covers eligibility questions in more detail.
The 14 Competency Areas in Detail
The exam draws from 14 competency headings published in ETA's Computer Service Technician competency requirements document (copyright 2025). These headings are unweighted, which means the official materials do not assign a percentage of questions to each area. Treat every domain as fair game, and do not assume that a "small" topic such as file management will be skipped. For a domain-by-domain walkthrough, see our complete guide to all 14 CST content areas.
Domain 1: Safety Procedures / Handling / Environmental Awareness
This is the foundation. Expect questions on protecting both the technician and the equipment.
- Electrostatic discharge (ESD) precautions and grounding practices
- Safe handling of components, monitors, and power supplies
- Proper disposal and environmental considerations for batteries, toner, and electronic waste
Domain 2: Computer Assembly and Disassembly
Know the order of operations and the physical details of putting a system together or taking it apart.
- Component installation sequence and connector orientation
- Form factors and case compatibility
- Proper tool use and documentation during teardown
Domain 3: Motherboards / Mainboard and Buses / System Resources
Understanding what the board connects and how devices share resources.
- Motherboard form factors, chipsets, and expansion slots
- Bus types and their relative characteristics
- System resources such as IRQs, DMA channels, and I/O addresses
Domain 4: Processor Characteristics
Be able to compare processors by the specifications that matter in service work.
- Sockets, clock speed, cache, and multi-core concepts
- Cooling requirements and thermal considerations
- Compatibility between processor and motherboard
Domain 5: Additional Memory Characteristics
Beyond basic RAM, the exam covers how memory types and modules differ.
- Module types, speeds, and capacity considerations
- Cache and ROM versus RAM roles
- Installation and compatibility rules
Domain 6: Secondary Storage Devices
This domain spans both older and current storage technologies.
- Hard drive interfaces, solid-state storage, and optical media
- Partitioning, formatting, and capacity calculations
- RAID concepts and removable storage
Domain 7: Adapter Cards and Peripheral Devices
Know what expansion cards do and how peripherals attach and are configured.
- Video, sound, network, and other expansion cards
- Driver installation and resource conflicts
- Common peripheral devices and their interfaces
Domain 8: Input/Output (I/O) Ports
Port identification is a reliable source of questions because it is highly testable.
- Serial, parallel, USB, video, and audio connectors
- Pin counts, connector shapes, and typical devices
- Cable types and maximum lengths where applicable
Domain 9: Power Concepts and Power Supplies
Where the non-programmable scientific calculator earns its place.
- Voltage, current, resistance, and wattage relationships
- Power supply connectors, rails, and ratings
- Surge protection and backup power concepts
Domain 10: Basic Networking Concepts Applicable to Computer Service
Networking here is scoped to what a service technician needs, not network engineering.
- Network interface cards, cabling, and connectors
- Basic addressing and common protocols
- Connecting a workstation to a network and verifying connectivity
Domain 11: Portables
Laptops and other portable systems have their own hardware and service considerations.
- Portable-specific components and expansion options
- Battery, display, and power management concerns
- Differences between desktop and portable servicing
Domain 12: Troubleshooting / Preventive Maintenance / Security Measures
The applied domain that ties everything else together.
- Systematic troubleshooting methodology and isolating faults
- Preventive maintenance routines and cleaning practices
- Basic security measures for systems and data
Domain 13: Operating Systems (Windows™ 7, 8, 10, 11 / Linux / Apple mac™)
The heading names specific operating system families, and the exam expects familiarity with each.
- Installation, configuration, and utilities across Windows versions
- Linux and Apple mac fundamentals at a service-technician level
- Differences in tools and interfaces between platforms
Domain 14: File Management
Often underestimated, yet it is a full competency area on its own.
- File systems, directory structures, and file attributes
- Copying, moving, and organizing files and folders
- Backup and recovery basics
Why Legacy and Current Technologies Both Matter
One distinctive feature of this credential is that the competency document retains named legacy technologies alongside current ones. The operating systems heading, for example, lists Windows 7, 8, 10, and 11 together, plus Linux and Apple mac. Candidates who study only the newest hardware and software can find themselves unprepared for questions that reference older connectors, older bus types, or earlier Windows versions.
This is also why sloppy borrowing from other certifications' study materials can backfire. A resource built around a different exam may skip legacy topics this credential still tests, or emphasize cloud and virtualization topics that are not among the 14 headings. Our CST study guide keeps the focus on the actual competency list.
Pathways: Standalone, Journeyman, and A+ Rollover
There is more than one way to earn or build on the credential, and the differences matter for planning.
Standalone Computer Service Technician
The standalone credential does not require the Certified Electronics Technician Associate (CETa). However, the competency document suggests CETa or equivalent basic electronics preparation, because the power, voltage, and component-level questions assume you understand basic electrical concepts. If your background lacks electronics fundamentals, add that preparation to your plan before test day.
Journeyman path
The Journeyman path requires CETa plus at least two years of combined training and experience. It is a higher tier for technicians who want to document both knowledge and field time.
CompTIA A+ rollover route
Holders of a valid CompTIA A+ (ce) may qualify for a separate USD 80 rollover route to the credential. The requirement is specific: it must be a valid A+ (ce), and a lifetime A+ does not qualify. If you hold a lifetime A+ and assumed it would roll over, plan to take the examination instead.
| Path | Key requirement | Cost note |
|---|---|---|
| Standalone | No CETa required; CETa or equivalent electronics prep suggested | USD 80 exam fee |
| Journeyman | CETa plus at least two years of combined training/experience | See ETA for tier details |
| A+ (ce) rollover | Valid A+ (ce); lifetime A+ does not qualify | USD 80 rollover |
For a broader look at prerequisites, our CST requirements guide walks through qualification questions step by step.
Who Hires Certified Computer Service Technicians
The credential suits roles centered on hands-on computer hardware support rather than purely software or network engineering work. Typical employers include:
- Computer repair shops and retail service centers that diagnose and repair customer systems.
- Corporate and institutional IT departments that maintain fleets of desktops and laptops.
- Schools and training programs where technicians support lab and classroom equipment.
- Managed service providers and field service companies that dispatch technicians to client sites.
- Government and military-affiliated environments that value documented technician competencies.
Because the exam is theory-only, employers often pair the credential with evidence of practical skill, such as work history or the Journeyman path's experience requirement. To explore openings and earning expectations, see our pages on CST jobs and the CST salary guide, and weigh the investment with our CST ROI analysis. If you want formal preparation options, our overview of CST training is a good starting point.
Sequencing Your Preparation by Domain
Because the 14 domains are unweighted, a balanced plan beats one that over-invests in favorite topics. The sequence below groups domains by how they build on one another. Adjust the pacing to your background, and use our exam difficulty guide to gauge which areas tend to trip candidates up.
Foundations: Safety and Assembly
- Domain 1 (safety, handling, environmental awareness) first, since ESD and handling concepts recur everywhere
- Domain 2 (assembly and disassembly) to build a mental model of the physical system
- Fill any electronics gaps now if you have not completed CETa-level basics
Core Hardware
- Domains 3, 4, and 5: motherboards and buses, processors, and memory
- Make comparison tables for sockets, bus types, and memory modules
Storage, Cards, Ports, and Power
- Domains 6, 7, 8, and 9 together, because storage interfaces, cards, ports, and power all connect to the motherboard
- Practice power calculations with a non-programmable scientific calculator
Networking, Portables, and Applied Skills
- Domains 10, 11, and 12: networking basics, portables, and troubleshooting methodology
- Troubleshooting scenarios integrate earlier domains, so use them as a self-check
Operating Systems, Files, and Full Review
- Domains 13 and 14: Windows 7, 8, 10, and 11, Linux, Apple mac, and file management
- Finish with timed practice sets of 80 questions in two hours
Key Takeaway
Do timed 80-question practice sets before exam day. The two-hour limit gives you roughly 90 seconds per question, and pacing is easier to learn in rehearsal than on the day. Use our CST practice tests for timed runs, and keep our CST cheat sheet handy for last-minute review of ports, power values, and operating system differences.
Every candidate should reserve review time for the domains that feel least relevant to daily work. Legacy connectors and older Windows versions are easy to dismiss, yet they are named in the competency requirements. For data on how candidates fare overall, see what we can say about the CST pass rate.
Keeping the Certification Active for Four Years
The credential lasts four years. Standard maintenance involves three pieces:
- The maintenance form, submitted to ETA.
- Continuing education or employer verification. Either complete 10 continuing-education contact hours per year (40 over the four-year cycle), or provide supervisor-completed employer verification.
- Maintenance fees of USD 25 per year, or USD 100 per four-year cycle.
The employer-verification alternative is useful for technicians who work in organizations that document their staff's ongoing responsibilities and are willing to attest to them. If you do not have a supervisor who can complete that verification, plan on logging your continuing-education hours steadily rather than leaving them until the end of the cycle. Our main CST certification overview and the what is CST page summarize the credential at a glance.
Frequently Asked Questions
The exam has 80 questions to be completed in two hours. You need a score of 75% to pass, which equals 60 correct answers. It is a proctored theory exam with no hands-on component.
The exam fee is USD 80. If you test remotely through ExamRoom.AI, which is arranged through ETA, an additional USD 16 two-hour proctoring fee applies. That proctoring fee also applies to a remote free retake.
Yes. One free examination retake is available within one year of your initial session. If you test remotely for the retake, the USD 16 proctoring fee still applies.
No. The standalone credential does not require CETa, though the competency document suggests CETa or equivalent basic electronics preparation. The Journeyman path does require CETa plus at least two years of combined training and experience.
A valid CompTIA A+ (ce) qualifies for a separate USD 80 rollover route. A lifetime A+ does not qualify for that route, so holders of a lifetime A+ would take the standard examination.
With a clear view of the format, fees, pathways, and all 14 competency areas, you can build a preparation plan that covers the whole competency list rather than just the topics you already know. When you are ready to test your readiness under timed conditions, head to the main practice test site and work through full-length sets.