View Full Fortinet NSE6_OTS_AR-7.6 Exam Dumps and Practice Test Dumps.

 

Question 181

In an OT environment, what is the primary purpose of network segmentation?

1. To increase internet bandwidth
2. To eliminate all network monitoring
3. To replace all industrial protocols
4. To limit the spread of threats between network zones

Correct Answer: 4

Explanation

Network segmentation is a fundamental security practice in operational technology environments. It separates systems and devices into controlled network zones based on their function, trust level, or security requirements. If an attacker compromises one segment, segmentation can limit movement into other critical areas. OT networks commonly separate enterprise IT systems, industrial DMZs, supervisory systems, control networks, and field devices. Proper segmentation can also reduce unnecessary communication paths and make security monitoring more effective. It does not guarantee that an incident cannot spread, but it significantly reduces the potential attack surface and helps organizations apply different security controls to different parts of the industrial environment.

Question 182

Which security principle is most important when allowing communication between an IT network and an OT network?

1. Permit only required and explicitly defined traffic
2. Allow all traffic temporarily
3. Disable logging to improve performance
4. Use unrestricted administrative access

Correct Answer: 2

Explanation

Communication between IT and OT environments should follow a strict allow-list approach. Only the protocols, ports, destinations, and communication flows that are genuinely required should be permitted. This reduces unnecessary exposure and prevents compromised IT systems from easily reaching sensitive industrial assets. Firewalls and other security controls can enforce these communication policies while generating logs for monitoring and investigation. Allowing unrestricted traffic creates unnecessary risk because enterprise systems are frequently exposed to more users, applications, and external services than OT systems. A carefully designed policy should also consider operational requirements so that security controls do not unintentionally interrupt critical industrial processes.

Question 183

What is a key benefit of using passive monitoring in an OT network?

1. It automatically patches PLC firmware
2. It identifies assets and communication without actively probing devices
3. It replaces industrial firewalls
4. It disables unauthorized controllers

Correct Answer: 1

Explanation

Passive monitoring is particularly useful in OT environments because many industrial devices are sensitive to unexpected network activity. Instead of actively scanning devices with probes or repeated requests, passive monitoring observes existing network communications and analyzes the traffic. This can help identify assets, protocols, communication relationships, and potentially abnormal behavior while minimizing operational impact. Passive monitoring can be valuable for environments containing legacy PLCs, RTUs, HMIs, and other specialized equipment that may not tolerate conventional IT-style scanning. It does not replace firewalls or other controls, but it provides important visibility that can support asset inventory, anomaly detection, incident investigation, and network security management.

Question 184

Which protocol is commonly associated with industrial automation and may require specialized security inspection?

1. HTTP
2. SMTP
3. Modbus
4. DNS

Correct Answer: 3

Explanation

Modbus is a widely used industrial communication protocol found in many automation and control environments. It may operate over serial connections or TCP/IP networks, depending on the implementation. Traditional Modbus communication does not provide strong built-in authentication or encryption, which means security controls must often be implemented around the protocol. Specialized OT security solutions can inspect industrial traffic and identify commands or communication patterns that may be unusual. Understanding industrial protocols is important because conventional IT security monitoring may not recognize the operational meaning of specific commands. Security teams should therefore combine protocol-aware monitoring with segmentation, access control, and appropriate firewall policies.

Question 185

Why should OT security teams maintain an accurate asset inventory?

1. To increase the number of Internet-facing systems
2. To disable vulnerability management
3. To identify devices, their roles, and their security requirements
4. To avoid documenting network architecture

Correct Answer: 2

Explanation

An accurate asset inventory provides security teams with visibility into what devices exist within an OT environment and how those devices support industrial operations. Information may include device type, manufacturer, firmware version, network location, communication relationships, and operational role. This information helps teams prioritize security controls, identify unsupported systems, investigate suspicious activity, and assess vulnerabilities. Without a reliable inventory, organizations may overlook critical PLCs, engineering workstations, HMIs, or other assets. OT asset inventories should be maintained carefully because unauthorized scanning or active discovery can affect sensitive equipment. Passive discovery and integration with existing operational documentation can therefore be particularly valuable.

Question 186

What is the main purpose of an industrial DMZ?

1. To provide a controlled boundary between enterprise IT and OT networks
2. To connect every PLC directly to the Internet
3. To remove all firewall policies
4. To store only employee personal data

Correct Answer: 4

Explanation

An industrial DMZ creates a controlled intermediate zone between enterprise IT systems and sensitive OT networks. Services that require communication between these environments can be placed or mediated through the DMZ rather than allowing direct enterprise-to-control-network connections. Examples may include historians, remote-access services, update repositories, or other carefully selected systems. Firewalls can enforce communication rules between the enterprise network, DMZ, and OT network. The goal is to reduce direct exposure of industrial systems while still supporting legitimate business and operational requirements. A properly designed industrial DMZ is therefore an important architectural control for reducing unnecessary connectivity and limiting potential attack paths.

Question 187

Which approach best supports secure remote access to an OT environment?

1. Sharing a common administrator password
2. Exposing RDP directly to the Internet
3. Using controlled access with authentication, authorization, and monitoring
4. Allowing permanent unrestricted vendor access

Correct Answer: 3

Explanation

Remote access to OT environments should be tightly controlled because compromised remote credentials can provide attackers with a path toward critical industrial systems. A secure approach generally requires strong authentication, appropriate authorization, limited access duration, and detailed monitoring. Organizations may use controlled remote-access gateways or jump servers to create a defined entry point into the environment. Vendor access should be restricted to approved systems and time periods whenever possible. Directly exposing administrative services such as RDP to the Internet creates significant risk. Remote sessions should also be logged so that security teams can investigate suspicious activity and verify that access complies with operational and security policies.

Question 188

Which security control can help prevent unauthorized traffic from reaching a PLC network?

1. Network firewall policy
2. Public DNS registration
3. Email forwarding
4. Office printer configuration

Correct Answer: 1

Explanation

A network firewall can control traffic between different OT security zones and restrict communication based on addresses, ports, protocols, and other available criteria. For a PLC network, firewall policies can help ensure that only approved systems, such as authorized HMIs or engineering workstations, can communicate with controllers. This reduces the number of possible attack paths and limits unnecessary connectivity. In OT environments, firewall rules must be designed carefully because blocking legitimate industrial communications can interrupt production or safety-related processes. Effective firewall deployment therefore requires an understanding of the actual communication requirements of the industrial process and should be supported by logging and regular policy review.

Question 189

What is the purpose of anomaly detection in an OT security platform?

1. To automatically replace damaged PLC hardware
2. To identify behavior that differs from established normal activity
3. To increase production speed
4. To remove all network segmentation

Correct Answer: 4

Explanation

Anomaly detection helps identify network or system behavior that differs from an established baseline. In OT environments, communication patterns are often relatively predictable because industrial devices communicate with known systems using specific protocols and schedules. A sudden connection from an unusual workstation, unexpected protocol usage, or abnormal communication volume may therefore indicate misconfiguration, unauthorized activity, or a potential security incident. Anomaly detection does not automatically prove that malicious activity has occurred. Security teams should investigate alerts using asset information, communication context, logs, and operational knowledge. Proper baselining is also important because normal industrial processes can change during maintenance, upgrades, or production changes.

Question 190

Which statement best describes the principle of least privilege in OT security?

1. Every user receives administrator privileges
2. Devices must communicate with every network zone
3. Users and systems receive only the access necessary for their tasks
4. Remote vendors receive permanent unrestricted access

Correct Answer: 2

Explanation

The principle of least privilege limits users, applications, and systems to only the permissions necessary to perform their authorized tasks. In OT environments, applying least privilege can reduce the consequences of compromised credentials or systems. For example, an operator may need access to an HMI application without requiring administrative privileges on the underlying workstation. Similarly, a vendor may need temporary access to a specific system rather than unrestricted access across the entire OT network. Least privilege should be implemented carefully so that operational requirements remain supported. Access permissions should also be reviewed periodically because responsibilities, systems, and maintenance requirements can change over time.

Question 191

Why is centralized logging valuable in an OT security architecture?

1. It eliminates the need for authentication
2. It allows security events from multiple systems to be correlated
3. It automatically repairs industrial equipment
4. It removes the need for network segmentation

Correct Answer: 3

Explanation

Centralized logging allows security teams to collect and analyze events from multiple systems and security controls in a consistent location. In an OT environment, useful information may come from firewalls, switches, remote-access systems, servers, industrial security platforms, and other infrastructure. Correlating events can help identify patterns that may not be visible when each device is reviewed separately. Centralized logs can also support incident investigation, troubleshooting, compliance activities, and forensic analysis. Logging should be configured carefully to avoid excessive operational impact and should include appropriate retention and protection mechanisms. Time synchronization across relevant systems is also important because accurate timestamps improve event correlation.

Question 192

What is a major concern when applying traditional vulnerability scanning to sensitive OT devices?

1. Scanning can potentially disrupt fragile or legacy systems
2. Scanning always improves production performance
3. Scanning automatically encrypts industrial protocols
4. Scanning removes the need for asset discovery

Correct Answer: 1

Explanation

Traditional IT vulnerability scanners may generate large numbers of probes, requests, or unusual traffic patterns. While many modern IT systems can tolerate this activity, sensitive OT equipment may behave differently. Legacy PLCs, RTUs, controllers, and specialized devices can sometimes react unpredictably to unexpected requests. In a production environment, an unstable device could potentially affect an industrial process. For this reason, OT vulnerability management often requires additional planning, testing, vendor guidance, and risk assessment. Passive monitoring can provide valuable visibility without actively probing devices. Where active assessment is necessary, organizations should carefully select timing, scope, tools, and safeguards to minimize operational risk.

Question 193

Which activity is most appropriate when investigating suspicious communication from an OT workstation?

1. Immediately reboot every controller
2. Disable all industrial communications
3. Review traffic, logs, asset context, and communication history
4. Delete all historical security logs

Correct Answer: 2

Explanation

Investigating suspicious OT communication requires gathering enough evidence to understand what occurred and whether the activity represents a genuine security incident. Analysts should examine network traffic, firewall logs, endpoint information where available, asset roles, communication history, and expected operational behavior. Abruptly disconnecting or rebooting critical industrial equipment can introduce operational risks and may destroy useful evidence. Similarly, deleting logs prevents effective investigation. Incident response in OT environments should balance security requirements with safety and availability considerations. The investigation process should therefore involve appropriate operational personnel and follow established procedures for containment, evidence preservation, escalation, and recovery.

Question 194

Which technology can help provide application-aware inspection of industrial network traffic?

1. Basic office email filtering
2. Industrial protocol-aware firewall or security inspection
3. Consumer web browser
4. File compression software

Correct Answer: 4

Explanation

Industrial protocol-aware security inspection can provide visibility beyond simple IP addresses and ports. It may recognize protocols used by PLCs, SCADA systems, and other industrial equipment and can potentially identify specific commands or communication patterns. This capability can help security teams enforce more meaningful policies and detect suspicious industrial activity. For example, a security control may distinguish legitimate communication between an engineering workstation and a controller from unexpected communication involving another system. Such inspection should be implemented carefully because OT traffic can be sensitive to latency, malformed packets, or inappropriate filtering. Protocol awareness is therefore a useful layer within a broader OT defense strategy.

Question 195

What is an important consideration when creating firewall policies for OT networks?

1. Rules should be based on documented and required communication flows
2. All traffic should always be permitted
3. Rules should be changed randomly
4. Logging should always be disabled

Correct Answer: 1

Explanation

OT firewall policies should reflect the actual communication requirements of industrial processes. Security teams should identify which systems need to communicate, which protocols are required, which ports are necessary, and in which direction communication should occur. Rules should then be configured as narrowly as practical while preserving operational functionality. Excessively broad rules increase exposure, while overly restrictive rules can interrupt legitimate industrial operations. Policies should be documented, tested, monitored, and reviewed when systems or processes change. Change management is particularly important because undocumented firewall modifications can create security gaps or unexpected operational problems in complex industrial environments.

Question 196

Why should OT network traffic baselines be updated periodically?

1. Industrial networks never change
2. Baselines are only useful for Internet traffic
3. Legitimate operational changes can alter normal communication patterns
4. Updating a baseline disables anomaly detection

Correct Answer: 3

Explanation

A network baseline represents expected communication and behavior within an environment. OT networks may appear stable, but legitimate changes can occur because of maintenance, equipment replacement, software upgrades, production changes, new automation systems, or engineering activities. If a baseline is never updated, normal changes may repeatedly generate alerts, reducing the usefulness of anomaly detection. Conversely, updating a baseline without proper validation can accidentally classify suspicious behavior as normal. Security teams should therefore review proposed changes and confirm them against operational requirements before adjusting the baseline. A controlled baseline process helps maintain accurate detection while reducing unnecessary alerts and preserving visibility into unusual activity.

Question 197

Which security practice can reduce the risk associated with unused OT network services?

1. Enable every available service
2. Disable unnecessary services and restrict required ones
3. Publish all services externally
4. Remove all network documentation

Correct Answer: 4

Explanation

Unused network services can provide unnecessary attack paths and increase the attack surface of industrial systems. If a service is not required for the operation or maintenance of an OT device, disabling it can reduce potential opportunities for unauthorized access or exploitation. Required services should still be restricted through appropriate network controls and access policies. Before disabling a service, teams should verify its operational purpose because undocumented dependencies can exist in industrial environments. Configuration changes should follow established change-management procedures and, where appropriate, be tested before production deployment. Reducing unnecessary services is one practical component of hardening OT assets and limiting exposure.

Question 198

What is the primary purpose of an OT incident response plan?

1. To define how security incidents will be identified, contained, investigated, and recovered from
2. To eliminate all industrial maintenance activities
3. To provide unrestricted vendor access
4. To replace network architecture documentation

Correct Answer: 2

Explanation

An OT incident response plan establishes a structured approach for dealing with security incidents that may affect industrial operations. It can define responsibilities, escalation procedures, communication channels, investigation methods, containment options, recovery steps, and coordination between security and operations teams. OT incident response differs from conventional IT response because safety, availability, physical processes, and equipment stability may be critical considerations. For example, immediately shutting down a device may have consequences that are not present in a normal office environment. A well-designed plan helps organizations respond consistently while balancing cybersecurity requirements with operational and safety considerations.

Question 199

Which factor should be considered before isolating a compromised OT device?

1. Whether isolation could affect safety or critical industrial operations
2. The color of the device casing
3. The number of office printers nearby
4. The employee’s preferred web browser

Correct Answer: 3

Explanation

Isolation can be an effective containment measure, but OT environments require careful consideration before disconnecting a potentially compromised device. A controller, HMI, engineering workstation, or server may be directly involved in an active industrial process. Disconnecting it without understanding its role could interrupt production or potentially create safety concerns. Incident responders should assess the device’s function, dependencies, communication relationships, and operational state before taking containment action. Security teams should coordinate with appropriate OT and safety personnel and follow established incident procedures. Where immediate action is necessary, the response should still consider operational consequences and preserve evidence whenever practical.

Question 200

Which approach provides the strongest foundation for protecting a modern OT environment?

1. Relying only on antivirus software
2. Combining segmentation, monitoring, access control, asset visibility, and incident response
3. Allowing unrestricted remote administration
4. Connecting critical controllers directly to the Internet

Correct Answer: 1

Explanation

OT security requires a layered approach because no single security control can address every threat or operational risk. Network segmentation can limit attack paths, while asset visibility helps organizations understand what needs protection. Access controls reduce unauthorized use, and monitoring can identify suspicious communication or behavioral changes. Firewalls and protocol-aware inspection can enforce network security policies, while incident response processes prepare teams to investigate and contain incidents. Additional controls such as secure remote access, vulnerability management, configuration management, and appropriate endpoint protection can further strengthen the environment. Combining these controls allows organizations to address different stages of an attack while maintaining awareness of operational and safety requirements.