TAP vs. SPAN in OT Environments: Making the Right Choice for Network Traffic Monitoring

In the world of network traffic monitoring, two essential tools vie for the spotlight: TAPs (Test Access Points) and SPANs (Switched Port Analysers). While both serve the purpose of overseeing network traffic, they differ significantly in how they achieve this goal. In this comprehensive guide, we'll explore the intricacies of TAPs and SPANs, focusing on their utility in OT (Operational Technology) environments. By the end of this journey, you'll understand why TAPs are often the superior choice for monitoring network traffic in critical OT environments.

Before we embark on this enlightening exploration, let's clarify what TAPs and SPANs are:

TAPs:
These are physical devices inserted between two network devices. Their primary function is to create a copy of all traffic flowing between these devices, all without affecting the live traffic. This unique ability to monitor network traffic without impacting performance makes TAPs an ideal choice for critical environments like OT.

SPANs:
On the other hand, SPANs are configuration options available on network switches. They enable the mirroring of traffic from one port to another, allowing network traffic monitoring without the need for additional hardware. However, it's crucial to note that SPANs can impact network performance, as they utilise bandwidth to mirror traffic.

When it comes to monitoring network traffic in OT environments, TAPs have several advantages over SPANs:

1. Performance

One of the most significant advantages of TAPs is that they have no impact on network performance. Since they create a copy of traffic rather than mirroring it, live traffic remains unaffected. This is paramount in OT environments, where performance is often mission-critical.

2. Security

TAPs provide a more secure method of monitoring network traffic. In contrast, SPANs can be vulnerable to attack because they essentially create a copy of network traffic on a different port. This vulnerability can expose your network to potential threats, a risk that's unacceptable in OT environments where security is paramount.

3. Scalability

The ability to scale network monitoring solutions to meet the needs of the OT environment is essential. TAPs offer this flexibility. You can easily add or remove TAPs as necessary, adjusting your monitoring infrastructure without affecting the network's overall performance.

While TAPs are the preferred choice for monitoring network traffic in OT environments, there may still be scenarios where SPANs are appropriate. SPANs could be a suitable option in non-critical environments where performance is not a major concern. However, for OT environments where performance and security are critical, TAPs remain the better choice.

In the context of TAP vs. SPAN in OT environments, organisations can benefit from the following Microminder services to enhance their network visibility, security, and performance:

Network Security Solutions:
Microminder's network security solutions can assist organisations in enhancing their overall network security posture. These solutions help identify and mitigate potential threats, ensuring that the network remains secure. When deciding between TAPs and SPANs, it's crucial to maintain a secure network environment. Network security solutions can provide insights into which approach is better suited for specific security needs.

Unified Security Management (USM) Services:
USM services offer a centralised view of the security landscape. For organisations in OT environments, having a unified view of network security, including the use of TAPs or SPANs, can help streamline security management. USM services can assist in monitoring the effectiveness of either approach and identifying potential security issues.

Vulnerability Assessment Services:
Understanding vulnerabilities in the network is essential for making informed decisions about TAPs or SPANs. Vulnerability assessment services identify potential weaknesses in the network, enabling organisations to address these vulnerabilities effectively.

Managed Network Detection and Response (NDR):
Managed NDR services continuously monitor the network for suspicious activities and provide insights into potential security incidents. Whether using TAPs or SPANs, NDR can enhance threat detection capabilities and provide real-time visibility into network events.

Network Tap (TAP) vs. SPAN Assessment Services:
Organisations can benefit from assessment services that help them determine whether TAPs or SPANs are more suitable for their specific OT environment. These services provide expert guidance on selecting the right network monitoring solution based on security, performance, and visibility needs.

Cyber Risk Quantification:
Cyber risk quantification services help organisations understand the potential risks associated with TAPs and SPANs in their specific OT environments. By quantifying the risks, organisations can make informed decisions about which solution aligns better with their risk tolerance and security requirements.

IoT Security Services:
If IoT devices are part of the OT environment, IoT security services are invaluable. They can help secure IoT devices and networks and ensure that TAPs or SPANs are effectively monitoring these devices.

By leveraging these Microminder services, organisations can make informed decisions about whether to implement TAPs or SPANs in their OT environments. The services provide insights into security vulnerabilities, risk assessments, and network monitoring capabilities, enabling organisations to choose the most suitable solution for their specific requirements.

Talk to our experts today

In Conclusion, When it comes to monitoring network traffic in OT environments, TAPs emerge as the superior choice. Their ability to ensure high performance, provide robust security, and offer scalability without impacting the network makes them the go-to solution. In contrast, SPANs, with their potential impact on network performance and security vulnerabilities, are best suited for non-critical scenarios.

At Microminder CS, we understand the intricacies of OT environments and the critical need for robust network traffic monitoring. We offer solutions that seamlessly integrate with TAPs, ensuring that your OT environment remains secure, efficient, and reliable.