- The ETA DCI exam is 75 multiple-choice questions in 2 hours; you need 75% to pass.
- The written exam costs USD $155, and one free retake is allowed within one year.
- Certification also requires an ETA-approved hands-on course and practical assessment, even if you test remotely.
- The outline lists 22 knowledge categories with no official percentage weights, so study every domain.
Which DCI This Sheet Covers
"DCI" is an acronym shared by several unrelated credentials. This cheat sheet covers one of them: the Data Cabling Installer (DCI) certification from ETA International. It is a stand-alone credential, so you do not need the Associate CET (CETa) first. If you want the plain-language background before the facts, see What Is DCI? and What Does DCI Stand For?. For the full study plan, the companion piece is the DCI Study Guide 2026.
Everything below comes from ETA's published credential pages, its FAQ and maintenance pages, and the DCI competency requirements document. Public sources were reviewed on October 5, 2026. Use this page as a fast review layer, then confirm current details with ETA before you register.
Exam Facts at a Glance
| Item | What to Know |
|---|---|
| Certifying body | ETA International (ETA) |
| Credential | Data Cabling Installer (DCI) |
| Prerequisite credential | None; stand-alone, no Associate CET (CETa) required |
| Written exam fee | USD $155 |
| Question count | 75 multiple-choice questions |
| Time allowed | 2 hours |
| Passing score | 75% |
| Retake policy | One free retake within one year of the first examination |
| Hands-on component | ETA-approved hands-on training course plus practical assessment |
| Certification term | Four years |
The arithmetic is worth memorizing: 75% of 75 questions is about 56.25, so you should plan on getting at least 57 correct. For a closer look at the cut score, read DCI Passing Score 2026. For the full fee picture beyond the exam itself, see DCI Certification Cost 2026.
The Hands-On Requirement
This is the fact most candidates miss when they skim a cheat sheet. Passing the multiple-choice exam is not the whole credential. ETA requires an ETA-approved hands-on training course and a practical assessment for certification. Taking the written exam remotely does not remove the practical requirement.
- Written exam: 75 multiple-choice questions, 2 hours, 75% to pass.
- Practical side: approved hands-on course and assessment.
- Optional self-study: ETA's eITprep resource costs $59.95 for six months. It does not award certification and does not replace the required hands-on course or the examination.
For the eligibility details in one place, see DCI Requirements 2026. For course options, see DCI Training.
The 22 Domains on One Page
ETA's competency requirements document (copyright 2023) lists 22 major knowledge categories. ETA does not publish a percentage allocation for them, so no weights are inferred here. Because every category is fair game, the practical approach is to group them by theme and make sure none is left unstudied. The DCI Exam Domains Guide goes deeper on each one.
Foundations (Domains 1-4)
Domain 1: Safety. Domain 2: Basic Electricity. Domain 3: Data Cabling Introduction. Domain 4: Data Communications Basics.
- Expect basic electrical relationships and safe working practice questions.
- Know the vocabulary of data communications before tackling standards.
Standards, Design and Construction (Domains 5-8)
Domain 5: Cabling Specifications and Standards. Domain 6: Basic Network Design: Architecture and Implementation. Domain 7: Cable Construction. Domain 8: Cable Performance Characteristics.
- Connect how a cable is built to how it performs.
- Learn which standards the outline references, and which edition, before assuming a newer one applies.
Code and Structure (Domains 9-10)
Domain 9: National Electrical Code and Underwriters Laboratories Requirements. Domain 10: Telecommunications Cabling System Structure.
- Code and listing requirements are testable facts, not judgment calls.
- Be able to describe how a cabling system is organized end to end.
Tools, Media and Connectivity (Domains 11-16)
Domain 11: Data Cabling Installer Tools. Domain 12: Transmission Media for Networking and Telecommunications. Domain 13: Work Area Telecommunications Outlet and Connectors. Domain 14: Local Area Network Interconnection and Internetworking. Domain 15: Wireless Heterogeneous Cabling Networks. Domain 16: Cabling System Components.
- Match each tool to its task, and each medium to its use.
- Do not skip the wireless domain just because the credential is about cabling.
Design, Install, Test, Fix, Document (Domains 17-22)
Domain 17: Cabling System Design. Domain 18: Cabling Installation. Domain 19: Connector Installation. Domain 20: Cabling Testing and Certification. Domain 21: Cabling Troubleshooting. Domain 22: Documentation.
- This block mirrors the real job sequence, so scenario questions tend to live here.
- Documentation is its own domain; treat it as testable, not an afterthought.
Calculation and Troubleshooting Cues
The outline includes Basic Electricity, Cable Performance Characteristics, Cabling Testing and Certification, and Cabling Troubleshooting. Together these are where calculation-style and diagnose-the-fault questions are most likely to appear. ETA's exam rules allow a nonprogrammable scientific calculator and scratch paper, so practice the arithmetic by hand and with that kind of calculator.
Calculation habits to build
- Practice basic electrical relationships until unit conversions are automatic.
- Rehearse working through performance measurements step by step on scratch paper rather than in your head.
- Check units and reasonableness of every result before choosing an answer.
A troubleshooting routine that maps to Domain 21
- Identify the symptom precisely: no link, intermittent link, or poor performance.
- Check the simplest causes first: connections, terminations, and patching.
- Compare against documentation and test results from when the link was certified.
- Isolate the segment, fix one variable at a time, and retest.
- Record what you found and changed, which connects directly to Domain 22.
Copper Installation, Testing and Documentation
Copper cabling is a core theme of the credential, running through cable construction, connector installation, installation practice, testing, and documentation. Rather than memorize isolated trivia, learn the chain of work as a candidate would perform it.
Installation and Termination
Domains 18 and 19 cover how cable is run and how connectors are installed.
- Know why handling and termination technique affect performance.
- Tie termination quality back to the performance characteristics in Domain 8.
- Connect the work area outlet (Domain 13) to the rest of the structured system (Domain 10).
Testing and Certification of Links
Domain 20 addresses verifying that installed cabling meets requirements.
- Know the difference between simply getting a link to work and certifying it against a standard.
- Understand what a failed test is telling you, then map that to a likely cause in Domain 21.
Documentation
Domain 22 is the record of what was built and verified.
- Documentation supports troubleshooting later and proves the work was done correctly.
- Expect questions on what records an installer should produce and keep.
Key Takeaway
Study the installer workflow as one connected loop: design, install, terminate, test, document, and troubleshoot. Questions that look unrelated usually test a different step of the same loop.
Test-Day Logistics
- Delivery: ETA Certification Administrators administer online testing through Trapeza or paper examinations. ETA's general FAQ also lists Exam Room.AI remote proctoring.
- Identification: photo ID is required.
- Allowed materials: scratch paper and a nonprogrammable scientific calculator.
- Retake: one free retake within one year of your first examination.
- Scheduling: arrange your test window around your hands-on course timeline; see DCI Exam Dates 2026.
Because the exam is 75 questions in 120 minutes, you have roughly 96 seconds per question. That is comfortable for recall questions and tight only if you stall on a calculation. Mark a hard item, move on, and return with leftover time. To judge how demanding the experience is, read How Hard Is the DCI Exam?, and for what published data does and does not say about results, see DCI Pass Rate 2026.
Assigning Domains to Weeks
This is the one study-method section, and it is tied to DCI content. Sequence the domains so that early weeks supply the vocabulary that later weeks depend on. Adjust the length to your own timeline and your hands-on course dates.
Foundations
- Safety, Basic Electricity, Data Cabling Introduction, Data Communications Basics.
- Why first: every later domain assumes this vocabulary.
Standards and Construction
- Cabling Specifications and Standards, Basic Network Design, Cable Construction, Cable Performance Characteristics.
- Why here: performance makes sense only after you know how cable is built.
Code, Structure and Hardware
- NEC and UL requirements, system structure, installer tools, transmission media, outlets and connectors.
- Why here: these are fact-heavy and reward repetition.
Networks and Components
- LAN interconnection, wireless heterogeneous cabling networks, cabling system components, system design.
- Why here: they build on the media and structure you already know.
The Work Loop
- Cabling installation, connector installation, testing and certification, troubleshooting, documentation.
- Why last: scenario questions pull from everything above, so finish with timed practice.
Take timed sets in the final week using the DCI practice test, and review any domain where you consistently miss questions. Our full set of practice questions is built around the same 22 knowledge categories.
Certification Term and Maintenance
The credential runs on a four-year term. Maintaining it with Hands-On follows a defined set of requirements:
| Maintenance Item | Requirement |
|---|---|
| Form | Maintenance form |
| Continuing education | 6 hours per year; 24 hours over four years |
| Verification | Supervisor-completed employer verification |
| Fee | USD $25 per year; $100 over the cycle |
Plan renewal from the day you certify: log continuing-education hours as you earn them and keep your supervisor in the loop. Whether the credential pays off for your situation is a separate question, and it should be answered with evidence rather than assumption. See the DCI ROI analysis and the DCI salary guide, and for employer-side demand, DCI Jobs.
FAQ
The written exam has 75 multiple-choice questions with a 2-hour limit. You need 75% to pass, which works out to at least 57 correct answers.
No. Certification also requires an ETA-approved hands-on training course and practical assessment. Taking the written exam remotely does not remove that requirement.
No. The Data Cabling Installer credential is stand-alone and does not require CETa. See the DCI requirements guide for the complete eligibility picture.
ETA allows one free retake within one year of your first examination. Use the gap to review the domains where you were weakest before sitting it again.
Photo identification is required. Scratch paper and a nonprogrammable scientific calculator are permitted under ETA's examination instructions.
The term is four years. Maintenance with Hands-On requires a maintenance form, 6 continuing-education hours per year (24 over the cycle), supervisor-completed employer verification, and $25 per year ($100 over the four years).