- What the Mile2 C)HT Credential Actually Covers
- How to Read the 25 Content Areas
- Domains 1-14: The Hardware Side
- Domains 15-25: The Operating Systems Side
- Exam Format, Delivery and Policies
- Validity and Renewal Mechanics
- Sequencing the Domains in Your Study Plan
- Where This Knowledge Gets Used
- Source Conflicts Candidates Should Know About
- Frequently Asked Questions
- The 25 domains are published preparation topics from Mile2's outline, not an official weighted exam blueprint.
- Domains 1-14 cover hardware; Domains 15-25 map to the eleven Operating Systems Technician chapters.
- Mile2 publishes no percentage weights, so study every domain rather than guessing at emphasis.
- Credentials are valid for three years, with CEU-based or exam-based renewal routes.
What the Mile2 C)HT Credential Actually Covers
This guide is about the Hardware Technician & Operating Systems Technician (C)HT) credential administered by Mile2. Mile2's own terms identify the two halves separately: C)HT/CHT stands for Certified Hardware Technician, and C)OST/COST stands for Certified Operating Systems Technician. Mile2's self-study page describes the two certifications as delivered in one course, which is why this site covers them together. If you are new to the terminology, our explainers on what C)HT certification is and what C)HT stands for cover the naming in more depth.
The acronym is shared by several unrelated credentials in the industry. Everything below comes from Mile2's published C)HT-C)OST course outline and its web outline PDF, so none of it applies to other certifications that happen to abbreviate the same way.
How to Read the 25 Content Areas
The outline is organized as two course tracks. The hardware track has detailed chapters covering the physical machine, peripherals, mobile devices, printing and professional practice. The operating systems track has eleven detailed chapters covering operating systems, Windows management, networking, virtualization, cloud and security.
The 25 domains in this guide are built like this:
- Domains 1-13 follow the detailed hardware chapters in order.
- Domain 14 (TCP/IP and Transport Protocols) comes from the hardware summary list. It does not correspond to a separately numbered chapter in the detailed outline.
- Domains 15-25 follow the eleven detailed operating systems chapters.
There is a small discrepancy worth knowing: the hardware summary includes TCP/IP but omits Mobile Devices, while the detailed hardware outline includes Mobile Devices and omits a standalone TCP/IP chapter. We keep both so nothing a candidate might see is left out. Similarly, "Power Supplies" in the summary is an alias for Computer Power Supplies in the detailed chapters.
Domains 1-14: The Hardware Side
Domains 1-4: Diagnostics, Core Components and Memory
Domain 1: Troubleshooting
This is the foundation the rest of the hardware track builds on. Expect methodical thinking about how a technician isolates a fault, rather than memorized fixes.
- Work from symptoms toward causes in a repeatable order
- Learn to recognize which component families produce which symptoms
- Revisit this domain after finishing each later one, since every component chapter feeds back into diagnosis
Domain 2: Motherboards and CPUs
The central platform of any system. Candidates should understand how processors, sockets, chipsets, form factors and board components fit together, because compatibility questions in later domains depend on this vocabulary.
Domain 3: Computer Power Supplies
Power delivery is a frequent source of real-world faults. Know what a power supply provides to the system and how power problems present themselves.
Domain 4: Memory
Understand memory types, how modules are matched to platforms, and how memory faults show up during startup and operation.
Domains 5-8: Expansion, Storage and Peripherals
Domain 5: Computer Expansion
Covers adding capability to a system through expansion interfaces and cards. Pair this with Domain 2, since expansion options depend on what the board provides.
Domain 6: Physical Storage
Storage devices, their interfaces and their failure behavior. Technicians are expected to connect, configure and troubleshoot drives, so think in terms of tasks rather than definitions alone.
Domain 7: Input-Output Devices
The peripherals users touch every day, and the ports and connections that link them to the system.
Domain 8: Display Devices
Display technologies, connections and common visual faults. Questions here tend to reward practical recognition of what a symptom implies.
Domains 9-14: Cabling, Mobile, Printing, Builds, Procedure and Protocols
Domain 9: Network Cables and Connectors
The physical layer of networking: cable types, connectors and where each is used. This is the bridge between the hardware track and the networking domains later in the operating systems track.
Domain 10: Mobile Devices
Laptops and other portable hardware have their own components, repair considerations and connectivity features. Note that this appears in the detailed hardware outline but not in the hardware summary list.
Domain 11: Printers and Multifunction Print Devices
Printing technologies, maintenance and troubleshooting, including devices that combine printing with scanning and other functions.
Domain 12: Custom Computers
Assembling or specifying a system for a purpose. The outline's Custom Computers chapter also lists Wi-Fi standards and wireless-encryption subsections, so do not assume it is purely about physical assembly.
Domain 13: Operational Procedures
The professional side of the job: how a technician works safely and conducts themselves. Candidates sometimes under-study this because it feels less technical, but it is a published topic area like any other.
Domain 14: TCP/IP and Transport Protocols
Retained from the hardware summary. It overlaps conceptually with Domains 17 and 18 later, so studying them close together reinforces both.
If you want to see how these areas translate into difficulty, our breakdown in How Hard Is the C)HT Exam? discusses where candidates tend to struggle.
Domains 15-25: The Operating Systems Side
These eleven domains follow the detailed C)OST chapters. They shift from the physical machine to what runs on it and how it connects and defends itself.
Domains 15-16: Operating Systems and Windows Management
Domain 15: Operating Systems
The conceptual groundwork: what an operating system does, how different systems compare and how they are installed and maintained.
Domain 16: Windows Management
Day-to-day administration of Windows systems. This is a hands-on domain; time in a lab or virtual machine pays off more than rereading notes.
Domains 17-20: Networking From the Operating System's View
Domain 17: Network Basics
Core networking concepts that everything else in this group depends on.
Domain 18: Network Protocols
How devices communicate. Study alongside Domain 14, since the hardware summary's TCP/IP topic and this domain cover related ground.
Domain 19: Wireless Networking
Wireless standards, configuration and security. Remember that Domain 12 also touches Wi-Fi standards and encryption, so wireless knowledge is reinforced from two directions.
Domain 20: Windows Networking
Connecting and managing Windows systems on a network, tying Domains 16 and 17 together.
Domains 21-25: Virtualization, Security and SOHO Networks
Domain 21: Virtualization and Cloud Computing
Virtual machines and cloud services from a technician's perspective. Practical exposure to a hypervisor makes this far easier than theory alone.
Domain 22: Security Principles
The concepts behind protecting systems, which frame the more applied security domains that follow.
Domain 23: Security Technologies
The tools and mechanisms used to implement security.
Domain 24: Securing Devices and Data
Applying protection to endpoints and information, including how a technician hardens and safeguards the systems they support.
Domain 25: SOHO Network Configurations
Small office and home office networks pull together nearly every earlier networking and security topic into configuration scenarios. Treat it as a capstone and review it last.
Exam Format, Delivery and Policies
The combined outline describes 100 multiple-choice questions, approximately two hours and a 70% minimum grade. However, the outline's single exam paragraph does not clearly say how those figures divide between the separately named C)HT and C)OST exams. Because of that ambiguity, this guide does not assume a combined question count or a combined time limit. Check your Mile2 account for the exact parameters attached to the exam you are scheduling. For more on scoring, see C)HT Passing Score 2026.
| Item | What the sources say |
|---|---|
| Question style | Multiple choice |
| Described question count and time | 100 questions, about two hours, but not clearly allocated between the C)HT and C)OST exams |
| Minimum grade | 70% |
| Delivery | Online, through Mile2's Learning Management System with a Mile2.com account |
| Pre-exam requirements | Identification verification and policy acceptance |
| Training requirement | Not required to enter the certification exam |
| Exam version | No C)HT/C)OST exam revision is published |
One trap to avoid: the course-outline page's "Exam Only/Purchase Exam Combo" link leads to an unrelated product, the C)CSA exam combo. That page cannot tell you anything about this credential's exam identity or fees, so do not use it for budgeting. Also note that the outline's references to the five-day live class for each credential and 80 CEUs are course measures, not exam time. Our guide to exam dates and scheduling and the page on eligibility requirements expand on the practical side.
Validity and Renewal Mechanics
Credentials are valid for three years. Mile2's current renewal pages describe alternative routes:
- CEU route: a standard 60-CEU cycle with documented activities, paid renewal and an ethics attestation.
- Exam route: renewal by passing the latest applicable certification exam.
Mile2's FAQ lists USD 200 for the U.S. regional CEU renewal path. Eligible developing-region candidates may qualify for a lower price, and exam-based renewal may cost more. These are the only dollar figures this guide cites for this credential; confirm current pricing with Mile2 before budgeting.
Sequencing the Domains in Your Study Plan
Since there are no published weights, an even-coverage plan with deliberate pairing of overlapping domains is the sensible approach. A concise schedule that respects the dependencies between domains:
Platform hardware
- Domains 2, 3, 4 and 5 together, since compatibility questions cross all four
- Start Domain 1 (Troubleshooting) and keep returning to it
Storage, peripherals and the physical network
- Domains 6, 7, 8 and 9
- Domains 10, 11, 12 and 13, noting the wireless content inside Domain 12
Protocols and the operating system
- Domain 14 paired with Domains 17 and 18
- Domains 15, 16 and 20 using a lab or virtual machine
Wireless, cloud, security and capstone
- Domains 19, 21, 22, 23 and 24
- Domain 25 last, as a synthesis of everything before it
Key Takeaway
Pair Domain 14 with Domains 17 and 18, and Domain 12's wireless content with Domain 19. The overlaps are where one study session can serve two domains. For a fuller plan, see the C)HT Study Guide, and reinforce recall with the C)HT cheat sheet and practice questions on our main site.
Where This Knowledge Gets Used
The domains describe entry-level, hands-on support work: assembling and repairing machines, configuring operating systems, setting up small networks and applying baseline security. That maps naturally to help desk, desktop support, field service and small-office IT roles. We do not cite salary figures here because none are published in the sources for this credential; for context on roles, see C)HT jobs, and for return-on-investment thinking, Is the C)HT certification worth it? and the salary guide.
Source Conflicts Candidates Should Know About
Mile2's documents do not agree with each other in a few places, and a careful candidate should know where:
- Renewal requirements: the undated outline lists both an exam retake and 20 annual CEUs as requirements, while the renewal pages describe alternative routes.
- Grace period: the May 2026 policy's page 13 requires the CEU/recertification route within seven days of expiry and a full exam without CEUs afterward, while page 22 retains annual-CEU wording and says a full-price retake may be required after seven days.
- Exam version: the outline mentions a legacy CompTIA A+ 220-1002 reference, but that does not establish the Mile2 exam version or current A+ alignment.
- Topic lists: the hardware summary and detailed outline differ on TCP/IP and Mobile Devices, as described above.
When documents conflict, the safest move is to ask Mile2 directly and keep a record of the answer. Our pass rate article notes that no pass-rate data is published for this credential in the sources used here.
Frequently Asked Questions
No. They are the union of Mile2's published, unweighted preparation topics from the C)HT-C)OST outline. They are not an official domain count or an exhaustive blueprint, and no percentage weights are published in the sources reviewed.
No. Mile2's May 2026 Policies and Procedures permit certification-exam entry without buying Mile2 training. You still need a Mile2.com account, identification verification and policy acceptance.
Three years. Renewal is described as either a standard 60-CEU cycle with documented activities, paid renewal and an ethics attestation, or passing the latest applicable certification exam.
The combined outline describes a 70% minimum grade, 100 multiple-choice questions and about two hours, but does not clearly allocate those figures between the separately named C)HT and C)OST exams. Confirm the details for your specific exam in your Mile2 account.
Domain 14 (TCP/IP and Transport Protocols) overlaps with Domains 17 and 18, and the wireless content in Domain 12 overlaps with Domain 19. Studying these together saves time and reinforces both areas.