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100+ Free Tenable OT Practice Questions

Pass your Tenable Certified — OT Security exam on the first try — instant access, no signup required.

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In Tenable OT Security, what information is typically visible in an OT asset's detail page?

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2026 Statistics

Key Facts: Tenable OT Exam

60–90

Exam Questions

Tenable

70%

Passing Score

Tenable

90 min

Exam Duration

Tenable

$0–$200

Exam Fee

Tenable (free for customers)

150+

Industrial Protocols Supported

Tenable OT Security

3 years

Certification Validity

Tenable

The Tenable Certified OT exam has ~60–90 questions in 90 minutes with a 70% passing score. Core domains: OT security fundamentals and ICS architecture (20–25%), Tenable OT Security platform (25–30%), OT asset inventory (20–25%), threat detection and vulnerability management (20–25%), and compliance reporting (10–15%).

Sample Tenable OT Practice Questions

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

1What is the primary reason passive monitoring is preferred over active scanning in OT/ICS environments?
A.Active scanning probe packets can crash legacy PLCs and cause unintended physical process activations
B.Active scanning requires purchasing additional Tenable licenses not included with the OT platform
C.OT protocols like Modbus are not supported by active Nessus scan plugins
D.Regulatory requirements prohibit active scanning in all industrial environments
Explanation: Industrial controllers (PLCs, RTUs) often run real-time operating systems and communication stacks that were not designed to handle unexpected network probe traffic. Active scanning packets can cause CPU overload, unexpected register reads that trip safety interlocks, or communication failures that disrupt physical processes. Passive monitoring captures existing network traffic without injecting any probes, eliminating this risk.
2In the Purdue Enterprise Reference Architecture, which level contains PLCs (Programmable Logic Controllers) and RTUs (Remote Terminal Units)?
A.Level 1 (Basic Control)
B.Level 0 (Physical Process)
C.Level 2 (Supervisory Control)
D.Level 3 (Manufacturing Operations)
Explanation: Level 1 of the Purdue model is the Basic Control level, containing PLCs (Programmable Logic Controllers), RTUs (Remote Terminal Units), DCS (Distributed Control Systems) controllers, and other devices that directly control physical equipment by reading sensors and actuating control outputs. Level 0 contains the physical process equipment (pumps, valves, motors) itself.
3Which industrial protocol uses TCP port 502 for Ethernet-based communications?
A.Modbus TCP
B.DNP3
C.EtherNet/IP
D.Profinet
Explanation: Modbus TCP is the Ethernet implementation of the Modbus protocol and uses TCP port 502 as its standard communication port. Modbus was originally a serial protocol (Modbus RTU/ASCII) and Modbus TCP adapts it for modern Ethernet networks. It is one of the most widely deployed industrial protocols globally.
4How does the Tenable OT Security platform discover OT assets without disrupting industrial processes?
A.By passively analyzing network traffic captured via SPAN port or network TAP to identify device types from protocol fingerprinting
B.By sending low-frequency ICMP ping packets to enumerate live OT devices without triggering controllers
C.By connecting to each PLC's engineering workstation and reading the project configuration files
D.By scanning only during scheduled maintenance windows using the Tenable.io scanner
Explanation: Tenable OT Security's primary discovery method is passive network monitoring: a network sensor captures traffic from an OT network SPAN port or network TAP, then analyzes protocol messages (Modbus register reads, EtherNet/IP identity responses, etc.) to identify device vendor, model, firmware version, and communication relationships — without sending any probe packets.
5What does the Tenable OT Security platform use to classify OT assets by type (PLC, RTU, HMI, engineering workstation)?
A.OT protocol fingerprinting and response analysis during passive monitoring
B.Manual asset type assignment by the security administrator
C.Vendor-provided asset lists imported via CSV
D.Active Nessus scanning with OS fingerprinting plugins
Explanation: Tenable OT Security automatically classifies device types by analyzing the OT protocols each device uses, the responses to protocol queries, and the communication patterns observed. Siemens S7 protocol traffic identifies Siemens PLCs, EtherNet/IP identity responses identify Rockwell Automation devices, and Modbus function code patterns distinguish field devices from supervisory systems.
6In OT security, what does the term 'backplane detection' refer to in the context of Tenable OT Security?
A.Identifying individual I/O modules and cards installed in PLC chassis slots through protocol analysis
B.Detecting communications crossing the IT/OT network boundary
C.Monitoring backplane bus traffic between server CPUs and storage controllers
D.Identifying encrypted VPN connections from field devices to SCADA servers
Explanation: Backplane detection in Tenable OT Security refers to the platform's ability to identify individual modules installed in a PLC or DCS chassis's backplane slots by analyzing rack-query protocol messages (e.g., Rockwell CIP identity requests, Siemens S7 slot queries). This provides granular inventory down to individual I/O cards, not just the overall PLC chassis.
7Which OT compliance standard applies specifically to the cybersecurity of bulk electric systems (power grid)?
A.NERC CIP (North American Electric Reliability Corporation Critical Infrastructure Protection)
B.IEC 62443 (Industrial Automation and Control Systems Security)
C.NIST SP 800-82 (Guide to Industrial Control Systems Security)
D.ISA/IEC 62443-2-1 (Security Management System)
Explanation: NERC CIP (North American Electric Reliability Corporation Critical Infrastructure Protection) is the mandatory cybersecurity compliance framework for organizations operating bulk electric systems (generators, transmission systems, control systems for the power grid) in North America. Compliance is enforced by regional entities and FERC. Non-compliance results in significant financial penalties.
8What makes IEC 62443 significant as an OT security standard?
A.It provides a comprehensive framework for cybersecurity across industrial automation and control systems applicable to all industries
B.It applies exclusively to oil and gas pipeline control systems
C.It replaces NERC CIP as the mandatory compliance framework for all energy sectors
D.It defines only the minimum password length requirements for SCADA user accounts
Explanation: IEC 62443 is the international series of standards for industrial cybersecurity developed by IEC and ISA. It covers security management (62443-2-1), component security requirements (62443-4-2), security levels (SL 1–4), and supply chain security. It applies to all industrial sectors (manufacturing, energy, water, chemicals) and addresses system owners, integrators, and component vendors.
9In the Tenable OT Security platform, what does the 'Network Map' feature visualize?
A.Communication relationships between OT assets discovered through passive traffic analysis
B.Physical cable routing between PLCs and field instruments
C.Geographic locations of industrial assets across multiple facilities
D.Firewall rule sets between OT network zones
Explanation: The Network Map in Tenable OT Security provides a visual topology diagram showing discovered OT assets as nodes and the observed communication relationships between them as edges. This map is built from passively analyzed protocol traffic, revealing which devices communicate with each other and helping identify unexpected or unauthorized communication paths.
10Which type of Tenable OT Security event would be triggered if a new device appears on the OT network that was not present during the baseline discovery period?
A.New Asset Detected event (policy-based network change detection)
B.Critical vulnerability CVE event for the new device
C.Firmware version mismatch alert
D.License capacity warning for exceeding the asset count limit
Explanation: Tenable OT Security's policy-based detection generates events when the OT environment deviates from its established baseline. A 'New Asset Detected' event fires when a device appears on the network that was not part of the baseline inventory — a critical alert in OT environments where rogue or unauthorized devices pose significant safety and security risks.

About the Tenable OT Exam

The Tenable Certified OT Security exam validates expertise in securing industrial control systems (ICS), SCADA systems, and operational technology environments using the Tenable OT Security platform (formerly Tenable.ot / Indegy). It tests knowledge of OT/IT convergence, industrial protocols, passive asset discovery, threat detection, and OT compliance frameworks.

Questions

75 scored questions

Time Limit

90 minutes

Passing Score

70%

Exam Fee

$0–$200 (Tenable)

Tenable OT Exam Content Outline

20–25%

OT Security Fundamentals & ICS Architecture

Purdue model (levels 0–4), IT/OT convergence risks, industrial protocols (Modbus TCP, DNP3, EtherNet/IP, Profinet, BACnet), safety instrumented systems, and OT security priorities (availability > confidentiality)

25–30%

Tenable OT Security Platform

Platform deployment (network tap, SPAN port, passive sniffing), sensor placement strategy, active querying vs. passive monitoring, integration with Tenable.io/Tenable.sc via connector, and user management

20–25%

OT Asset Inventory & Management

Automatic device discovery via protocol analysis, asset classification (PLC, RTU, HMI, engineering workstation), backplane slot detection, firmware and software version tracking, and network topology visualization

20–25%

Threat Detection & Vulnerability Management

OT-specific CVE detection, ICS-CERT advisories, policy-based event detection (network change, new device, firmware change), threat intelligence integration, and event-to-alert workflows

10–15%

Reporting & OT Compliance

IEC 62443 compliance mapping, NERC CIP reporting, NIST SP 800-82 alignment, dashboard customization, and executive-level OT risk reporting

How to Pass the Tenable OT Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 75 questions
  • Time limit: 90 minutes
  • Exam fee: $0–$200

Keys to Passing

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

Tenable OT Study Tips from Top Performers

1Master the Purdue model levels 0–4 — exam questions map detection strategies to specific model layers
2Know that OT security prioritizes availability over confidentiality — opposite of traditional IT security
3Passive monitoring is the primary detection method in OT to avoid disrupting live industrial processes
4Tenable OT identifies assets via protocol fingerprinting, not port scanning — critical exam concept
5Know the major industrial protocols: Modbus (TCP/RTU), DNP3, EtherNet/IP, Profinet, BACnet
6IEC 62443 is the primary international standard for industrial control system cybersecurity
7NERC CIP applies specifically to bulk electric systems (power grid) — different from general OT frameworks

Frequently Asked Questions

What is the Tenable OT Security platform?

Tenable OT Security (formerly Indegy) is a purpose-built platform for discovering, monitoring, and securing operational technology assets in industrial environments. It uses passive network monitoring to detect assets and threats without disrupting sensitive OT systems, and can integrate with Tenable.io for unified IT/OT visibility.

What industrial protocols does Tenable OT support?

Tenable OT Security supports over 150 industrial protocols including Modbus, DNP3, EtherNet/IP, Profinet, BACnet, IEC 61850, OPC UA, HART-IP, and many proprietary vendor protocols (Siemens S7, Rockwell CIP, Schneider Modicon). Protocol knowledge is critical for the certification exam.

What is the Purdue model in OT security?

The Purdue Enterprise Reference Architecture defines five levels of industrial network hierarchy: Level 0 (physical process/field devices), Level 1 (basic control — PLCs, RTUs), Level 2 (supervisory — SCADA, HMI), Level 3 (manufacturing operations — historians, batch management), and Level 4 (enterprise IT). Security controls differ at each level.

Why is passive detection preferred in OT environments?

Active scanning (sending probe packets) can crash legacy PLCs, cause unexpected valve/actuator activations, or disrupt time-sensitive control loops. Passive detection captures and analyzes existing network traffic without sending any packets to OT devices, eliminating disruption risk while still building a complete asset inventory.

What compliance frameworks are relevant to OT security?

Key OT compliance frameworks include IEC 62443 (industrial cybersecurity standard for automation and control systems), NERC CIP (Critical Infrastructure Protection for bulk electric systems), and NIST SP 800-82 (Guide to Industrial Control Systems Security). Tenable OT Security includes built-in compliance dashboards for these frameworks.

How should I prepare for the Tenable Certified OT exam?

Study Tenable University's OT Security courses, understand the Purdue model and key industrial protocols, learn passive vs. active detection trade-offs, practice with Tenable OT Security's asset inventory and event management features, and complete 100+ practice questions across all five domains.