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● Cybersecurity Glossary

What is IT/OT convergence?

IT/OT convergence is the integration of enterprise Information Technology systems (business applications, cloud services, corporate networks) with Operational Technology systems (SCADA, PLCs, DCS, industrial control systems). Convergence enables organizations to use operational data for business intelligence, predictive maintenance, and remote monitoring. But it also exposes previously air gapped industrial environments to the full IT threat landscape. Securing converged networks requires a fundamentally different approach: network segmentation following the Purdue model and IEC 62443, passive Network Traffic Analysis for OT visibility, and unified IT/OT security management that correlates threats across both domains.

IT/OT convergence definition and drivers

IT/OT convergence is the process of connecting Information Technology systems with Operational Technology systems so that data and services can flow between the corporate and industrial domains. In practical terms, this means that SCADA data reaches ERP systems, sensor readings feed machine learning models, engineers can monitor equipment remotely through cloud dashboards, and business logic influences production schedules in real time.

For decades, IT and OT operated as entirely separate worlds. OT networks used proprietary protocols, ran on dedicated hardware, and had no connection to the internet. This physical isolation (the air gap) was the primary security control. Convergence dissolved that air gap, driven by several forces:

1
Industrial IoT (IIoT) and sensor data
IIoT devices generate massive volumes of operational data from equipment, processes, and environments. This data is only valuable if it reaches analytics platforms, which typically reside on IT infrastructure or in the cloud.
2
Predictive maintenance and AI
Machine learning models analyze vibration, temperature, and performance data from OT sensors to predict equipment failures before they occur. These models require connectivity between the sensors (OT) and the compute infrastructure (IT/cloud).
3
Remote monitoring and management
Engineers and operators need to monitor and manage geographically distributed sites without traveling to each location. This requires OT systems to be accessible through IT networks and, increasingly, through cloud platforms.
4
ERP and supply chain integration
Production data from the factory floor feeds directly into enterprise resource planning systems for inventory management, scheduling, and supply chain optimization. This requires real time data flow from OT Level 3 into IT Level 4.
5
Regulatory reporting and compliance
Regulations like NIS2 require organizations to report on the security posture of their critical infrastructure. This demands visibility across both IT and OT, which is only possible in converged architectures.

The convergence paradox: Convergence creates operational efficiency and competitive advantage, but every connection between IT and OT is also a potential attack path. Organizations that converge without securing the boundary face the full IT threat landscape reaching their most critical industrial systems.

Flat networks vs segmented networks

The single most important architectural decision in IT/OT convergence is whether the network is flat or segmented. This distinction determines whether a security incident stays contained or spreads from office systems to the factory floor:

A flat network allows any device to communicate with any other device without restriction. There are no zones, no firewalls between IT and OT, and no access controls separating a business laptop from a PLC. In a flat converged network, an attacker who compromises an employee’s email account through phishing can move laterally until they reach SCADA servers, HMIs, or PLCs. The attack surface is the entire network.

A segmented network divides the environment into zones based on function and security requirements. The Purdue model defines the standard hierarchy: enterprise IT at Levels 4-5, an IT/OT DMZ as the boundary, site operations at Level 3, control systems at Levels 1-2, and physical processes at Level 0. Traffic between zones is controlled by firewalls with deny all, permit by exception rules. A compromise in the IT zone cannot reach OT without passing through the DMZ, where it is inspected and blocked.

Dimension Flat Network Segmented Network
Communication Any device talks to any device Traffic only flows between authorized zones through firewalls
Attack surface Entire network is reachable from any point Each zone is isolated; compromise is contained
Lateral movement Unrestricted; attacker moves freely from IT to OT Blocked at zone boundaries by firewalls and access controls
Visibility Difficult; traffic patterns are chaotic Clear; each zone has defined traffic baselines
Compliance Does not meet IEC 62443 or NIST SP 800-82 Aligned with Purdue model, IEC 62443 zones and conduits
Recovery A single breach can affect the entire operation Breach is contained to one zone; other zones continue operating

Manufacturing remains the most ransomware targeted sector for the fourth consecutive year, with attacks rising 61% in 2025. The majority of successful attacks exploit flat networks where there is no segmentation between IT and OT. Network segmentation is the single most effective defense against lateral movement from IT into production environments.

Convergence risks and attack paths

Understanding how attacks traverse converged networks is essential for designing effective defenses. The typical attack path in a converged IT/OT environment follows a predictable pattern:

1
Initial access through IT
The attacker gains entry through a phishing email, exploited vulnerability in a public facing application, or compromised third party vendor with VPN access. This happens entirely within the IT network.
2
Lateral movement toward OT
The attacker escalates privileges and moves laterally through the IT network. If the network is flat or the IT/OT DMZ is poorly configured, the attacker reaches OT network segments.
3
OT reconnaissance
Once inside the OT network, the attacker identifies industrial devices (PLCs, SCADA servers, HMIs) by observing industrial protocol traffic (Modbus, DNP3, OPC UA). OT devices are typically unauthenticated, making reconnaissance straightforward.
4
Industrial impact
The attacker deploys ransomware that encrypts OT systems, sends unauthorized commands to PLCs to alter setpoints, disables safety instrumented systems, or exfiltrates proprietary process data. The consequences range from production downtime to equipment damage to physical safety incidents.
5
Persistent access
Advanced attackers establish persistent access within OT networks, which is difficult to detect because OT environments lack the endpoint detection tools common in IT. The attacker can return at will to cause further damage.

The convergence risk in numbers: Over 70% of OT organizations experienced malware intrusions in the past year, with the majority entering through IT. Manufacturing is the most ransomware targeted sector for the fourth consecutive year. The average cost of downtime from an OT ransomware attack is $1.9 million per day. 45% of OT environments assessed by security firms had complete lack of network visibility.

How to secure converged IT/OT networks?

Securing a converged environment is not a single project but a phased program. The following practices, ordered by impact, form the foundation of a converged security architecture:

1
Establish the IT/OT DMZ
Create a network buffer zone between enterprise IT and operational OT. All traffic between the two domains must pass through the DMZ, where firewalls, data diodes, and inspection systems enforce access control. No direct communication from Level 4 to Level 3 or below. This is the most important single control.
2
Segment OT into zones and conduits
Divide the OT network into zones based on function and risk, following IEC 62443. Each production line, control system, or facility becomes a zone with its own firewall policies. Conduits between zones are inspected and restricted to only the protocols and devices that need to communicate.
3
Deploy passive Network Traffic Analysis
Use NTA tools that observe OT traffic without injecting packets. AI models learn the normal behavior of the industrial network (which devices communicate, using which protocols, at what intervals) and flag anomalies that indicate unauthorized access, lateral movement, or protocol abuse.
4
Implement virtual patching
Apply IPS signatures at the network level to block exploit traffic targeting known vulnerabilities in legacy OT devices that cannot be patched directly. This protects PLCs, RTUs, and SCADA software without requiring production downtime.
5
Enforce identity based access control
Replace shared credentials and broad VPN access with granular, identity based controls. Require multi factor authentication for all remote sessions. Ensure vendor and contractor access is time limited and restricted to specific devices and protocols.
6
Unify IT/OT security monitoring
Deploy a single security platform (XDR) that correlates events from both IT and OT environments. An attack that starts with a phishing email in IT and moves toward OT should be detected as a single correlated incident, not as two separate unrelated alerts.

Visibility and monitoring in converged environments

Visibility is the foundation of security in converged networks. Without knowing what devices are connected, what traffic is flowing, and what constitutes normal behavior, security teams cannot detect threats or respond effectively.

The asset visibility challenge

Many organizations do not have a complete inventory of their OT assets. Devices installed over decades by different vendors create environments where no one knows exactly what is on the network. Traditional IT asset discovery tools use active scanning, which can crash OT equipment. OT asset discovery must use passive methods: observing network traffic to identify devices by their communication patterns without sending any probing packets.

Network Traffic Analysis with AI

Network Traffic Analysis (NTA) is the primary monitoring tool for converged environments. NTA passively observes all traffic on the OT network, building a behavioral baseline of normal operations. AI models learn which devices communicate with which other devices, using which protocols, at what intervals, and with what payload characteristics. When something deviates from this baseline, whether it is an unauthorized IT device communicating with a PLC, a Modbus command sent outside normal operating hours, or an unusual volume of data leaving the OT network, the NTA system generates an alert.

Correlated detection across IT and OT

The most advanced attacks traverse both IT and OT. A phishing email compromises an IT account, the attacker moves laterally through IT, crosses the DMZ, and reaches OT. If IT and OT security operate in silos with separate monitoring tools, each team sees only part of the attack. A unified Extended Detection and Response (XDR) platform correlates events across IT endpoints, network traffic, cloud services, and OT telemetry, presenting the full attack chain as a single incident.

Visibility gaps are the norm, not the exception: 45% of OT environments assessed by professional security teams in 2024 had a complete lack of network visibility. Without visibility, detection, triage, and response are impossible at scale. Passive NTA combined with unified XDR closes this gap without disrupting industrial operations.

Frameworks and governance for convergence

Securing IT/OT convergence is as much a governance challenge as a technical one. Clear ownership, shared policies, and alignment with recognized frameworks are essential:

IEC 62443 zones and conduits

IEC 62443 provides the definitive technical framework for securing converged industrial networks. Its zones and conduits model defines how to segment the network, what security controls to apply at each boundary, and how to assign Security Levels (SL-1 through SL-4) based on risk. The standard also addresses the roles of asset owners, system integrators, and product suppliers, ensuring accountability across the entire supply chain.

NIST CSF and SP 800-82

The NIST Cybersecurity Framework provides the overall governance structure (Identify, Protect, Detect, Respond, Recover), while NIST SP 800-82 maps those functions specifically to industrial control systems. Together they complement IEC 62443 and are widely referenced by organizations building converged security programs.

NIS2 and regulatory mandates

The NIS2 Directive in Europe mandates that operators of critical infrastructure implement risk management measures that cover their entire technology estate, including converged IT/OT networks. NIS2 requires incident reporting within 24 hours, supply chain security measures, and personal liability for management. Similar mandates exist in the US through CIRCIA and NERC CIP for specific sectors.

Organizational alignment

Convergence requires IT and OT teams to work together under shared governance. In 2025, 52% of organizations reported that the CISO is now responsible for OT cybersecurity (up from 18% in 2022), and 80% planned to move OT security under the CISO within 12 months. A cross functional security committee that includes IT, OT, operations leadership, and executive management creates shared accountability. Unified security policies that acknowledge OT specific constraints, rather than applying IT policies wholesale, build buy in from both sides.

Teldat solutions for IT/OT convergence

Teldat addresses the security challenges of IT/OT convergence through two integrated solutions: be.OT for industrial OT security and be.Safe XDR for unified threat detection and response across both domains.

be.OT: securing the OT side of convergence

be.OT provides the four pillars of OT security in converged environments. Visibility through automated asset discovery identifies every device on the industrial network using passive methods. Control through NGFW with over 1,000 ICS specific application controls and IPS signatures for industrial protocols (Modbus, DNP3, BACnet, OPC UA). Detection through Network Traffic Analysis with AI that learns normal OT behavior and detects anomalies including lateral movement from IT, unauthorized protocol commands, and zero day attacks. Protection through virtual patching that blocks exploit traffic targeting legacy devices without requiring production downtime.

be.Safe XDR: unified IT/OT threat detection

be.Safe XDR correlates security events from IT endpoints, network traffic, cloud services, and OT telemetry from be.OT into a single platform. An attack that begins with a phishing email in IT and progresses toward OT appears as one correlated incident chain, not as disconnected alerts in separate consoles. AI powered detection identifies complex attack patterns that span both domains, and automated response workflows contain threats before they reach critical OT assets.

Embedded security at every boundary

Teldat embeds NGFW and IDS/IPS capabilities directly into its networking hardware, turning each router and switch into a security enforcement point. In converged architectures, this means security is applied at the IT/OT DMZ, at every zone boundary within OT, and at every branch or remote site, without requiring separate security appliances. Dedicated CPUs handle inspection without impacting network throughput.

Teldat’s convergence advantage: As both a network hardware manufacturer and cybersecurity provider, Teldat delivers security at the intersection of IT and OT. be.OT secures the industrial network with asset discovery, ICS specific NGFW, NTA with AI, and virtual patching. be.Safe XDR unifies IT and OT security monitoring with correlated detection and automated response. Together, they provide organizations with a single ecosystem that secures the entire converged architecture, from the enterprise edge to the factory floor.

Frequently asked questions about IT/OT convergence (FAQ’s)

❯ What is IT/OT convergence?

IT/OT convergence is the integration of enterprise IT systems (business applications, cloud, corporate networks) with Operational Technology systems (SCADA, PLCs, industrial control systems). It enables operational data to be used for business intelligence and predictive maintenance, but it also exposes previously isolated OT environments to cyber threats from the IT network.

❯ Why is IT/OT convergence risky?

Convergence connects industrial systems designed for reliability (not security) to corporate networks facing constant cyber threats. Over 70% of OT organizations experienced malware intrusions in the past year, with the majority originating from IT. A flat converged network without segmentation allows an attacker who compromises a business system to reach SCADA and PLC equipment directly.

❯ What is the difference between flat and segmented networks?

A flat network allows any device to communicate with any other device. A segmented network divides the environment into zones (following the Purdue model and IEC 62443) with firewalls between them. Segmentation is the single most effective defense against lateral movement from IT into production environments.

❯ How do you secure a converged IT/OT network?

Secure converged networks by: (1) Establishing the IT/OT DMZ. (2) Segmenting OT into zones and conduits per IEC 62443. (3) Deploying passive NTA for OT visibility. (4) Implementing virtual patching for legacy devices. (5) Enforcing identity based access with MFA. (6) Unifying IT/OT security monitoring with XDR.

❯ What is the IT/OT DMZ?

The IT/OT DMZ is a network buffer zone between enterprise IT and operational OT. All traffic between IT and OT must pass through the DMZ, where firewalls and inspection systems enforce access control. No direct communication is allowed between IT systems and OT controllers. It is the most critical security control in any converged architecture.

❯ What role does Network Traffic Analysis play?

NTA provides passive visibility into converged IT/OT networks without disrupting operations. AI models learn normal OT behavior and detect anomalies such as unauthorized commands, lateral movement from IT, or exploitation of industrial protocols. NTA combined with XDR closes the visibility gap that 45% of OT environments still face.

Secure your converged IT/OT Network with Teldat

be.OT and be.Safe XDR deliver asset discovery, ICS specific NGFW, NTA with AI, virtual patching, and unified IT/OT security monitoring for converged industrial environments.