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100+ Free CWIDP Practice Questions

Pass your CWNP Certified Wireless IoT Design Professional (CWIDP-402) exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: CWIDP Exam

60

Exam Questions

Multiple-choice and multiple-selection

90 min

Time Limit

Prometric delivery

70%

Passing Score

CWNP CWIDP-402 (2024)

$350

Exam Fee

Per attempt, USD

3 yrs

Validity

CWNP recertification policy

CWISA

Prerequisite

Required before CWIDP

The CWNP CWIDP-402 (Certified Wireless IoT Design Professional) is a 90-minute, 60-question exam delivered through Prometric, with a 70% passing score and a $350 USD fee. CWIDP-402 (2024 release) is the design-level CWNP IoT credential and requires CWISA as a prerequisite. The exam is divided across four domains: assessing existing IoT solutions (10%), gathering and defining requirements and constraints (30%), designing a wireless IoT solution (40%), and validating and optimizing the deployment (20%). It covers LoRaWAN, NB-IoT, LTE-M, 5G NR-RedCap, Zigbee, Thread, Matter 1.4, BLE 5.4, UWB (802.15.4z), Wi-SUN, RFID, MQTT 5.0, CoAP, OPC UA, LwM2M, DTLS 1.3, AES-CCM, DAC/PAI/PAA attestation, signed OTA, and RF validation. The credential is valid for 3 years.

Sample CWIDP Practice Questions

Try these sample questions to test your CWIDP exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A consultant is asked to evaluate an existing LoRaWAN deployment that has been running for two years. Which baseline artifact MUST be captured first to compare against future post-redesign measurements?
A.A current spectrum-occupancy and gateway-coverage map of the deployed sub-GHz band
B.A new RF site survey using only the 2.4 GHz band
C.A bill of materials for replacement gateways
D.A vendor quote for additional LoRaWAN end devices
Explanation: Assessment of an existing IoT solution requires documenting the current operating environment so it can be benchmarked. For a sub-GHz LoRaWAN system, that means capturing spectrum occupancy in the deployed ISM band (e.g., 868/915 MHz) and the resulting gateway coverage. Without that baseline, you cannot measure whether a redesign actually improved performance.
2While assessing a brownfield Zigbee 3.0 lighting deployment, you discover the network has slowly grown to 240 devices and has frequent parent-loss events. Which existing-system metric is the MOST useful to confirm the suspected scaling problem?
A.Average end-device sleep current in microamps
B.Router-to-end-device child-table utilization on the routers
C.Number of unique Wi-Fi SSIDs visible at the site
D.PoE budget on the lighting controller switch
Explanation: Each Zigbee 3.0 router maintains a finite child table (often 6-32 entries depending on stack). Frequent parent-loss in a growing mesh strongly suggests routers are at child-table capacity, forcing rejoins. Pulling child-table utilization from each router quantifies the saturation.
3An assessor is reviewing a hospital BLE asset-tracking deployment. Which document is the BEST single source for quickly identifying the as-built gateway placement and antenna types?
A.The hospital's HIPAA risk assessment
B.The original predictive Ekahau IoT design plus the as-built validation file
C.The BLE SIG core specification
D.The hospital's NIST CSF gap assessment
Explanation: The combination of the predictive (planned) design and the as-built validation export captures gateway coordinates, antenna models, and orientation as actually installed. CWIDP candidates are expected to read both the predictive plan and the post-install validation when assessing an existing deployment.
4An existing industrial Wi-SUN FAN deployment reports steadily rising packet error rate (PER) across the past 12 months. Which is the MOST likely root-cause category to investigate first during the assessment?
A.Foliage growth and seasonal multipath changes around the field area network
B.End-device firmware certificates expiring
C.Increased application-layer payload size
D.A new IPv6 prefix on the head-end router
Explanation: Wi-SUN Field Area Networks operate outdoors in sub-GHz bands and are sensitive to environmental change. Tree leaf-out, foliage growth, and new physical obstructions across a year measurably degrade link budget and increase PER. This is a classic 'environment drift' finding in CWIDP assessment work.
5You are assessing a multi-tenant warehouse with overlapping Zigbee, BLE, and 2.4 GHz Wi-Fi 6 networks. Which finding is the STRONGEST indicator that 2.4 GHz spectrum congestion is the primary issue?
A.Channel utilization above 60% on Wi-Fi channels 1, 6, and 11 during business hours
B.BLE devices showing TX power of +4 dBm
C.Zigbee coordinator running stack version 3.0
D.Wi-Fi 6 APs broadcasting both 2.4 GHz and 5 GHz radios
Explanation: Channel utilization above ~50-60% on the only three non-overlapping 2.4 GHz Wi-Fi channels (1/6/11) is a direct measurement of congestion that affects every 2.4 GHz technology sharing that band, including Zigbee and BLE. Spectrum analyzer measurements are the canonical evidence for coexistence-driven failures.
6During a brownfield assessment, the customer cannot produce any documentation for an installed Z-Wave network. Which approach is the MOST appropriate FIRST step?
A.Replace the entire network because undocumented systems cannot be assessed
B.Inventory and capture metadata from the Z-Wave controller (node list, SUC/SIS role, security class)
C.Send a packet sniffer trace to the manufacturer for reverse engineering
D.Open every device and read the chip markings
Explanation: When formal documentation is missing, the controller itself is the source of truth. Pulling the node list, SUC/SIS role, security class membership (S0 vs S2), and routing table re-creates an effective inventory of an undocumented Z-Wave network without disturbing it.
7Which combination BEST documents the security posture of an existing wireless IoT deployment for a CWIDP assessment report?
A.A vendor data sheet and a marketing whitepaper
B.Device identity inventory (cert/PSK), key rotation policy, OTA update history, and segmentation diagram
C.A list of installed power supplies
D.The site's surveillance camera count
Explanation: An assessment of security posture must capture how devices authenticate (X.509 / DAC / PSK), how cryptographic keys are managed, whether firmware is being patched (OTA history), and how the IoT segment is isolated from corporate IT. Those four items are the standard CWIDP security artifacts.
8An assessor is comparing an existing battery-powered LoRaWAN sensor's actual battery life (measured 14 months) against the design target (60 months). Which calculation is the BEST analytical tool to identify the gap?
A.Wh = (mAh x V) / 1000 combined with average current draw and active duty cycle
B.Free-space path loss at 868 MHz
C.Fresnel zone radius
D.Average wind speed at the site
Explanation: Battery-life gap analysis requires energy-budget math: total energy in watt-hours from the cell capacity (mAh x V / 1000) divided by average current draw (sleep current weighted with active TX/RX intervals). Comparing the measured average current to the design model exposes whether sleep current, TX duty cycle, or both have drifted from design assumptions.
9Which of the following is the BEST output of an existing-solution assessment phase before requirements are gathered for a redesign?
A.A signed change order for new gateways
B.A gap report listing measured KPIs vs. original design intent and current business needs
C.A list of every CWNP-certified engineer at the customer
D.A finalized RF channel plan
Explanation: The deliverable from the Assess domain is a gap report: what the current system was designed to do, what it actually does today, and where business needs have evolved. That gap report directly drives the next phase, requirements gathering.
10A retail chain reports that an installed BLE 5.0 beacon system intermittently fails to deliver proximity events. The assessor finds the original design specified 1 m accuracy but the deployment relies only on RSSI. Which redesign opportunity does this MOST directly justify?
A.Migration to UWB (IEEE 802.15.4z) for sub-meter ranging
B.Migration to LoRaWAN Class C
C.Migration to NB-IoT
D.Migration to Wi-Fi 7 only
Explanation: RSSI-based BLE proximity is well known to be unreliable below several meters. UWB (IEEE 802.15.4z) provides sub-meter ranging using time-of-flight and is the standard remediation when 1 m accuracy is a hard requirement.

About the CWIDP Exam

The CWNP Certified Wireless IoT Design Professional (CWIDP-402) credential validates the ability to define, design, validate, and assess wireless IoT solutions. Candidates are expected to gather requirements with stakeholders, navigate regulatory constraints (FCC Part 15, ETSI EN 300 220, EN 303 645, NIST IR 8259), design RF and network architecture across LPWAN, mesh, and cellular IoT technologies (LoRaWAN, NB-IoT, LTE-M, 5G NR-RedCap, Zigbee, Thread, Matter, BLE 5.4, UWB, Wi-SUN, RFID), choose application/transport protocols (MQTT 5.0, CoAP, AMQP, OPC UA, LwM2M, DTLS 1.3), engineer security (DAC/PAI/PAA, X.509 identity, AES-CCM, secure boot, signed OTA), and validate and optimize deployments using RSSI/SNR/PER measurements, sniffers, and spectrum analysis.

Assessment

60 multiple-choice and multiple-selection questions covering existing-solution assessment, requirements/constraints gathering, wireless IoT design (RF design, protocol selection, security and power architecture), and validation/optimization of wireless IoT deployments

Time Limit

90 minutes

Passing Score

70%

Exam Fee

$350 USD (CWNP / Prometric)

CWIDP Exam Content Outline

10%

Assess an Existing IoT Solution

Evaluate deployed IoT systems, document baselines (spectrum/coverage/security posture), produce gap reports against current business needs, identify risks introduced by environment drift and aging components

30%

Gather and Define Requirements and Constraints

Stakeholder elicitation, SMART functional and non-functional requirements, environmental and regulatory constraints (FCC Part 15, ETSI EN 300 220, EN 303 645, NIST IR 8259, GDPR/data residency), use-case workshops, traceability matrix, scaling and coverage targets

40%

Design a Wireless IoT Solution to Meet Requirements

RF design and link budgets, protocol selection (LoRaWAN 1.0.4, NB-IoT, LTE-M, 5G NR-RedCap, Zigbee 3.0, Thread, Matter 1.4 with Multi-Admin / DAC, BLE 5.4 / PAwR, UWB 802.15.4z, Wi-SUN, Wirepas, RFID, NFC, EnOcean, MIOTY), network architecture, application/transport (MQTT 5.0, CoAP, AMQP, OPC UA, LwM2M, DTLS 1.3), security architecture (X.509, AES-CCM, secure boot, signed OTA), power and energy harvesting

20%

Validate and Optimize the Wireless IoT Solution

Validation testing (RSSI/SNR/PER, throughput/latency/loss), walk and drive tests, 802.15.4 / BLE / Wi-Fi sniffers, spectrum analyzers, ADR tuning, channel and SF optimization, antenna placement, OTA reliability, lifecycle (onboarding, operation, decommissioning), and post-deployment KPI review

How to Pass the CWIDP Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: 60 multiple-choice and multiple-selection questions covering existing-solution assessment, requirements/constraints gathering, wireless IoT design (RF design, protocol selection, security and power architecture), and validation/optimization of wireless IoT deployments
  • Time limit: 90 minutes
  • Exam fee: $350 USD

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

CWIDP Study Tips from Top Performers

1Memorize the four-domain weighting (Assess 10% / Requirements 30% / Design 40% / Validate 20%) and use it to plan how much study time you spend on each area
2Practice writing SMART requirements from vague stakeholder statements; CWIDP-402 frequently tests your ability to convert 'fast and secure' into measurable KPIs
3Build a protocol-selection matrix comparing LoRaWAN, NB-IoT, LTE-M, 5G NR-RedCap, Zigbee, Thread, Matter, BLE 5.4, UWB, Wi-SUN, and RFID across range, throughput, latency, power, and license model
4Master RF link-budget math at SF7-SF12 for LoRaWAN and Wi-Fi/BLE PHY-rate trade-offs; expect numerical questions on coverage probability and fade margin
5Learn the Matter security model end-to-end: DAC chained to PAI to PAA, BLE-then-Wi-Fi/Thread commissioning, Multi-Admin Fabrics, and Matter Bridges to legacy Zigbee/Z-Wave
6Practice troubleshooting with the right tool for each radio: spectrum analyzer for RF energy, Sniffle/nRF Sniffer for BLE 5.x, Killerbee/Ubiqua for Zigbee/802.15.4, and Wireshark with cellular dissectors for NB-IoT/LTE-M backhaul

Frequently Asked Questions

What is the CWNP CWIDP-402 exam?

CWIDP-402 (Certified Wireless IoT Design Professional) is the design-level CWNP IoT credential released in 2024. It validates the ability to assess existing wireless IoT solutions, gather and define requirements and constraints with stakeholders, design RF and network architectures across LPWAN, mesh, and cellular IoT technologies, and validate and optimize the deployed solution. CWNP plans to refresh the exam as CWIDP-403 in 2027.

How many questions are on the CWIDP-402 exam and what is the passing score?

CWIDP-402 has 60 questions delivered in 90 minutes through Prometric, with a passing score of 70%. The question mix includes multiple-choice and multiple-selection items distributed across the four official domains: Assess an Existing IoT Solution (10%), Gather and Define Requirements and Constraints (30%), Design a Wireless IoT Solution to Meet Requirements (40%), and Validate and Optimize the Wireless IoT Solution (20%).

How much does the CWIDP exam cost and how is it scheduled?

The CWIDP-402 exam fee is $350 USD per attempt. CWNP migrated all certification exams from Pearson VUE to Prometric on August 1, 2024, so candidates schedule CWIDP-402 through Prometric, either at a test center or via online proctoring.

What prerequisites are required for the CWIDP?

CWNP requires the CWISA (Certified Wireless IoT Solutions Administrator) certification as a prerequisite for CWIDP. Candidates are expected to enter CWIDP already grounded in administering wireless IoT solutions and to layer design-level skills (requirements engineering, RF and protocol design, validation/optimization) on top of that base.

What technologies are covered on the CWIDP-402 exam?

CWIDP-402 covers a broad set of wireless IoT technologies and design disciplines: LoRaWAN 1.0.4 (with chirp spread spectrum, OTAA, ADR, and star-of-stars topology), Sigfox, NB-IoT (3GPP Release 13/14), LTE-M (Cat M1/M2), 5G NR-RedCap, Wi-SUN FAN, Wirepas Massive, MIOTY, Zigbee 3.0 over IEEE 802.15.4, Thread (with Border Routers, Routers, REEDs, Sleepy End Devices), Matter 1.4 (DAC/PAI/PAA, Fabrics, Multi-Admin, Bridges, Matter-over-Wi-Fi and Matter-over-Thread), Bluetooth Mesh and BLE 5.4 (including PAwR), UWB per IEEE 802.15.4z, RFID (UHF/HF/LF), NFC, and EnOcean. It also covers application/transport stacks (MQTT 5.0, CoAP/RFC 7252, AMQP 1.0, OPC UA, LwM2M, DTLS 1.3/TLS 1.3) and security primitives (AES-CCM, secure boot, signed OTA).

How long is the CWIDP credential valid?

CWIDP, like other CWNP credentials, is valid for 3 years from the issue date. Candidates renew by passing the current CWIDP exam version or by earning the higher CWNE (Certified Wireless Network Expert) where applicable to their track.

How should I prepare for the CWIDP-402?

Prepare by completing CWISA first, then studying CWNP's official CWIDP-402 exam objectives (the four-domain breakdown), practicing requirements gathering and traceability matrices, working RF link-budget math (TX power + antenna gain - path loss - building loss + fade margin against receiver sensitivity), reviewing protocol-selection matrices across LoRaWAN, NB-IoT, LTE-M, 5G NR-RedCap, Zigbee, Thread, Matter, BLE 5.4, and UWB, and practicing validation/troubleshooting using sniffers (Sniffle, Nordic nRF Sniffer, Killerbee) and spectrum analyzers.