- The Honest Difficulty Verdict
- Format and Time Pressure: What ITS-110 Actually Asks of You
- Domain-by-Domain Difficulty Ranking
- Who Finds It Harder (and Easier)
- Question Patterns That Trip Candidates
- Sequencing Your Prep Around the Blueprint
- The Cost of a Miss: Voucher, Retake, and Renewal
- Frequently Asked Questions
- ITS-110 has 100 multiple-choice/multiple-response questions in 120 minutes, including five minutes each for the agreement and tutorial.
- Securing IoT Portals carries 29% of the blueprint, so it deserves your largest block of study time.
- The passing score is 60% or 61% depending on form, so aim well above that on practice tests.
- No formal prerequisites exist, but IoT and security familiarity is recommended before you sit the exam.
The Honest Difficulty Verdict
The CertNexus Certified Internet of Things Security Practitioner (CIoTSP) exam, coded ITS-110, sits in the moderate range for security certifications. It is not a gatekeeper exam that demands years of hands-on penetration testing, and it is not a trivia quiz you can pass by skimming a glossary. Its difficulty comes from breadth: the blueprint spans web portals, identity, networking, cryptography, privacy, firmware, and physical security, all viewed through the lens of constrained, connected devices.
Because there are no formal education, experience, training-hour, or prior-certification prerequisites (see our CIoTSP requirements guide), the candidate pool is mixed. Some people arrive from network security, others from embedded development, others from general IT. That mix is why the exam feels easy to one person and punishing to another. The same question about securing a firmware update channel reads as routine to a developer and as unfamiliar to a network administrator.
If you want a sense of how candidates actually perform, review the CIoTSP pass rate analysis. Keep in mind that CertNexus does not publish a headline pass rate that we can quote as fact, so treat any specific percentage you see circulating online with caution.
Format and Time Pressure: What ITS-110 Actually Asks of You
The exam delivers 100 questions that mix multiple-choice (one correct answer) and multiple-response (select all that apply) items. You get 120 minutes, but that clock includes five minutes for the candidate agreement and five minutes for the tutorial, which leaves roughly 110 minutes of real question time. That works out to a little over a minute per question, which is comfortable for single-answer items and tighter for multiple-response items that require you to evaluate every option.
The exam is closed book, and we have not verified any permission to use an external calculator, so plan to work without one. It is delivered at Pearson VUE testing centers or through OnVUE online proctoring. If you choose online delivery, the proctoring requirements apply: a clean workspace, a working webcam and microphone, and a stable connection. Technical or environmental problems cost nerves and sometimes time, which is its own kind of difficulty.
| Exam Factor | ITS-110 Detail | Difficulty Impact |
|---|---|---|
| Question count | 100 multiple-choice/multiple-response | Moderate; breadth matters more than depth |
| Total time | 120 minutes (includes 5 min agreement and 5 min tutorial) | Manageable if you do not stall on multiple-response items |
| Passing score | 60% or 61% depending on form | Forgiving margin, but not a license to skip domains |
| Reference materials | Closed book | Requires genuine recall of protocols and controls |
| Delivery | Pearson VUE center or OnVUE online | Online adds environment and proctoring stress |
For the exact scoring threshold and how forms may differ, see our dedicated CIoTSP passing score breakdown.
Domain-by-Domain Difficulty Ranking
The blueprint (version 1.4, issued 15 January 2019 and modified 29 June 2022) divides the exam into seven domains totaling 100%. Weight tells you how many questions to expect; it does not tell you how hard each domain feels. Below is how the domains tend to play out for most candidates, ordered from where the points are to where the risk is.
Domain 1: Securing IoT Portals (29%)
The heaviest domain by far, and the one most likely to decide your result. It covers the web, mobile, and cloud-facing interfaces that users and administrators use to manage IoT devices.
- Common web application weaknesses and how they appear in device management dashboards
- Secure session handling, input validation, and protection of administrative interfaces
- Why default credentials and exposed management endpoints are recurring IoT failures
Difficulty rating: moderate to high. It is large, and candidates without a web security background need real study time here. Because it is nearly a third of the exam, a weak showing is hard to offset elsewhere.
Domain 2: Implementing Authentication, Authorization, and Accounting (14%)
This is the identity domain: proving who or what a device or user is, controlling what they can do, and recording what they did.
- Device identity versus user identity, and why constrained devices complicate credential storage
- Role-based and least-privilege access models
- Logging and accounting so that actions on devices can be audited
Difficulty rating: moderate. The concepts are standard, but the exam frames them around IoT constraints such as limited memory and intermittent connectivity.
Domain 3: Securing Network Services (14%)
Covers protecting the communication paths between devices, gateways, and back-end systems.
- Secure transport and why unencrypted protocols are a persistent risk
- Network segmentation and limiting exposure of device services
- Wireless and low-power networking considerations common in IoT deployments
Difficulty rating: moderate, easier if you already have networking experience and harder if your background is purely software.
Domain 4: Securing Data (14%)
Focuses on protecting data at rest, in transit, and in use across the device lifecycle.
- Encryption fundamentals and key management on resource-limited hardware
- Data integrity and protecting sensor data from tampering
- Secure storage and secure disposal of data when devices are retired
Difficulty rating: moderate to high for candidates new to cryptography, since you need to choose appropriate controls rather than just define terms.
Domain 5: Addressing Privacy Concerns (12%)
Examines how connected devices collect and expose personal information, and how to design for privacy.
- Data minimization and purpose limitation in device design
- User consent and transparency expectations for connected products
- How aggregated sensor data can reveal sensitive behavior even when individual readings look harmless
Difficulty rating: moderate. It is more conceptual than technical, but candidates who skip it lose 12% of available points.
Domain 6: Securing Software/Firmware (10%)
Addresses the code running on devices and how it is built, updated, and verified.
- Secure update mechanisms, signed firmware, and rollback protection
- Secure development practices and handling of third-party components
- Why unpatchable devices become long-term liabilities
Difficulty rating: moderate, with a steeper curve for non-developers.
Domain 7: Enhancing Physical Security (7%)
The smallest domain, covering threats that come from direct access to a device.
- Tamper resistance and tamper detection
- Protecting debug ports and exposed interfaces
- Risks to devices deployed in unsupervised public or industrial locations
Difficulty rating: lowest of the seven, but still worth a focused review since the questions can be easy points. For a deeper tour of every area, read our complete guide to the seven CIoTSP exam domains.
Who Finds It Harder (and Easier)
Because the blueprint is broad, your starting background predicts your difficulty better than your general intelligence or study hours. Use this as a self-assessment, not a verdict.
| Your Background | Likely Strengths | Likely Gaps |
|---|---|---|
| Network or systems security | Network Services, Authentication/Authorization/Accounting | Firmware, portal-specific web weaknesses, privacy |
| Web or application developer | Securing IoT Portals, Software/Firmware | Physical security, network protocols, privacy frameworks |
| Embedded or hardware engineer | Firmware, Physical Security, constrained-device reasoning | Portal security (the 29% domain), identity models |
| General IT or help desk | Practical familiarity with devices and users | Cryptography, secure design reasoning, most technical domains |
Notice that the embedded engineer, who might feel most at home with IoT, faces a gap in the single largest domain. That is a common surprise. If you fit that profile, front-load portal security in your plan.
Question Patterns That Trip Candidates
Rather than memorizing facts, expect to apply them. These patterns show up repeatedly in how candidates describe the exam, and they reflect the way the blueprint is built.
Multiple-response questions with plausible distractors
When a question tells you to select more than one answer, every option usually sounds reasonable in isolation. The skill is judging which controls actually address the stated threat. Read the scenario's threat first, then test each option against it.
"Best next step" scenarios
Several items describe a deployed IoT system with a flaw and ask for the most appropriate action. The wrong answers are often valid security practices applied at the wrong layer or the wrong time. For example, recommending a long-term redesign when the question asks for an immediate mitigation.
Constrained-device reasoning
Standard enterprise answers do not always fit a device with limited processing power, memory, or battery. Questions about authentication or encryption may reward the control that is practical for a constrained device, not the one that would be ideal on a server.
Cross-domain scenarios
A single item might involve an insecure portal that exposes a firmware update function, touching Domains 1, 3, and 6 at once. This is why studying only by isolated domain leaves candidates exposed.
Key Takeaway
Practice by threat, not by topic label. After each scenario, name the layer being attacked (portal, network, data, firmware, or physical) and the control that fits that layer. This habit transfers directly to ITS-110's scenario questions.
Sequencing Your Prep Around the Blueprint
Study method matters less here than study order. Tie the order to the weights: spend the most time where the most points are, and schedule your weakest domain early so you have time to revisit it. A sample arrangement for someone with a general security background is below; adjust it using the self-assessment above.
Securing IoT Portals (29%)
- Cover the full domain once, then revisit it at the end of the week with practice questions
- Give this domain extra time because it is nearly a third of the exam
Authentication/Authorization/Accounting and Network Services (14% each)
- Pair these because identity and transport controls often appear together in scenarios
- Practice constrained-device variations of standard controls
Securing Data and Software/Firmware (14% and 10%)
- Focus on encryption choices, key handling, signed updates, and rollback protection
- Spend extra time here if you lack a development or cryptography background
Privacy, Physical Security, and full-length practice
- Cover Addressing Privacy Concerns (12%) and Enhancing Physical Security (7%)
- Take timed 100-question practice tests and review every miss against the blueprint
Since the blueprint has been stable since its last modification in June 2022, you can rely on domain weights rather than guessing at coverage. For a fast final review, the CIoTSP cheat sheet condenses the must-know facts, and you can pressure-test your readiness on the CIoTSP practice tests before booking.
The Cost of a Miss: Voucher, Retake, and Renewal
Part of how hard an exam feels is what is at stake if you fail. For ITS-110, the stakes are moderate and softened by policy. The current voucher is $367.50 USD. Current policy includes one free same-version retake within the voucher validity period, which is normally 18 months. That retake is meaningful: it turns a first failure into a recoverable setback rather than a second full purchase, provided you use it on the same exam version and inside the window.
A few practical points follow from this:
- Do not treat the free retake as a plan. Schedule your first attempt for a date when you are genuinely ready, and treat the retake as insurance.
- If you miss, use your score feedback to target weak domains rather than rereading everything.
- The certification is valid for three years. The verified renewal route is taking the latest-version exam before your credential expires.
- CIoTSP is not on the reviewed CertNexus continuing-education-eligible list, so do not assume that 90 CE credits or a CE-only renewal fee apply to it.
For the complete money picture, see the CIoTSP certification cost breakdown, and for timing and scheduling windows, check CIoTSP exam dates. If you are weighing whether the effort is justified, our analysis of whether the CIoTSP certification is worth it covers the return side of that equation.
Frequently Asked Questions
It is broadly comparable, with moderate difficulty. Its distinguishing challenge is that it applies security concepts to constrained IoT devices and spans seven domains, so candidates strong in one layer often have to learn others from scratch.
The current official page lists a passing score of 60% or 61% depending on the form, while an older blueprint states 60%. Aim comfortably above that range on timed practice tests rather than targeting the minimum.
No formal education, experience, training-hours, reference, or prior-certification prerequisites exist. However, IoT and security familiarity is recommended, and candidates without it should plan extra study time.
Securing IoT Portals, at 29% of the blueprint, is the largest domain and should get the most attention. After that, Authentication/Authorization/Accounting, Securing Network Services, and Securing Data each carry 14%.
Current policy includes one free same-version retake within the voucher validity period, normally 18 months. Use your score feedback to focus on weaker domains before rebooking.