Network Segmentation


Network segmentation is a strategy that involves dividing a computer network into smaller, more manageable subnetworks or segments. By doing so, it helps improve security, performance, and efficiency of the overall network. This allows administrators to better control and monitor traffic, protect sensitive data, and prevent unauthorized access to specific areas of the network.

Key Takeaways

  1. Network segmentation is the process of dividing a larger network into smaller, more manageable subnetworks or segments, aimed at improving efficiency, security and performance.
  2. By isolating sections of the network from each other, network segmentation can reduce the risk of security breaches, resulting from unauthorized access and the spread of threats like malware and viruses.
  3. Network segmentation can also optimize network performance by reducing congestion and limiting the volume of unnecessary traffic, thereby improving overall network speed and latency.


Network segmentation is important because it enhances the overall security, performance, and manageability of a network.

By dividing the network into smaller, interconnected subnets, it limits the potential damage caused by cyber threats, as unauthorized access or attacks can be confined to a specific segment.

Furthermore, network segmentation improves performance by reducing collision domains, minimizing data packet congestion, and isolating network traffic, resulting in faster data transfers and reduced latency.

It also simplifies network management and maintenance by allowing administrators to focus on specific segments and implement access controls, monitoring, and updates more efficiently and with fewer disruptions to the entire network.

Ultimately, network segmentation plays a crucial role in maintaining a secure, efficient, and manageable IT infrastructure.


The purpose of network segmentation is to increase the overall security and efficiency of a network. In today’s modern world, businesses and organizations typically have numerous devices and systems connected to their networks which are of vital importance to their operations. Network segmentation involves dividing a large, complex network into smaller, more manageable subnetworks or “segments,” which are primarily done for security reasons as well as for optimized network performance.

By creating separate segments, it helps to limit the damage in case a cyber attack occurs by restraining the attacker within a single segment, instead of granting access to the entire network. Network segmentation is not only an essential element for security, but it also proves to be beneficial for the performance of the whole network. Each segment operates independently, allowing for reduced congestion, thus efficiently managing network traffic.

This ultimately results in minimizing the propagation of broadcast storms and limiting the strain on network resources. Furthermore, segmentation ensures that network resources are allocated appropriately, as critical or sensitive data remains isolated in respective segments, preventing unauthorized access. In conclusion, network segmentation enhances security and boosts overall network performance, making it an indispensable tool for any organization’s IT infrastructure.

Examples of Network Segmentation

Healthcare Organizations: In large hospitals and healthcare systems, network segmentation is crucial for protecting sensitive patient data and ensuring compliance with regulations such as HIPAA. Patient records, billing information, and lab results are all stored on different segments, reducing the likelihood of unauthorized access to critical data. For example, a hospital might separate the Electronic Health Record (EHR) system from its guest Wi-Fi network and administrative systems, ensuring that any potential cyber attack or network breach does not compromise medical data.

Corporate Offices: Companies often use network segmentation to protect their intellectual property, employee information, and financial records. In a typical corporate setting, the finance department, human resources, and research & development might have their own separate network segments. This not only ensures better security but also enhances performance by limiting the number of devices and traffic on each segment. For instance, a software company could separate software development environments from their general office systems, preventing unauthorized access to sensitive code and data.

Educational Institutions: Schools, colleges, and universities employ network segmentation to protect student records, research data, and other sensitive information. They might segment their networks based on various user types such as students, faculty, administration, and guests, each with different access levels and security requirements. For example, an educational institution could create separate network segments for student dormitories, administrative offices, research laboratories, and classroom computers, ensuring that students can access internet services without being able to access the confidential faculty or research data.

Network Segmentation FAQ

1. What is network segmentation?

Network segmentation is the practice of dividing a larger network into smaller, more manageable subnetworks or segments. This is done to improve network security, enhance performance, and better manage network traffic.

2. What are the benefits of network segmentation?

The main benefits of network segmentation include improved security – by isolating sensitive data and systems, enhanced performance – by reducing network congestion and collision domains, and simplified management – by allowing administrators to monitor and control specific segments more effectively.

3. How does network segmentation improve security?

Network segmentation improves security by creating boundaries between segments, which restrict unauthorized access to sensitive data and systems, contain potential threats, and minimize the impact of successful cyber-attacks. Each segment can have tailored security policies and access controls, ensuring that only authorized users can access specific resources.

4. What are some common techniques used for network segmentation?

Common network segmentation techniques include Virtual Local Area Networks (VLANs), subnetting, Network Access Control (NAC), and implementing firewalls and routers to control traffic between segments.

5. What factors should be considered when planning network segmentation?

When planning network segmentation, consider factors like the number of devices, network topology, security requirements, performance needs, ease of management, and available hardware and software resources. It’s important to carefully evaluate the organization’s goals and objectives before implementing the chosen segmentation technique.

6. Can network segmentation negatively impact network performance?

Though segmentation usually leads to improved performance, it may, in some cases, negatively impact the network performance if not properly configured. These negative impacts may occur due to excessive segmentation, inefficient routing, or poor traffic prioritization. Proper planning and monitoring can minimize these potential issues.

7. How often should network segmentation be reviewed and updated?

Network segmentation should be reviewed and updated regularly, ideally as part of an organization’s ongoing network management and security strategy. This process should take into account changes in the network, such as the addition of new devices, applications, or security policies. Regular audits and performance assessments can help ensure that network segmentation remains effective and optimized.

Related Technology Terms

  • Subnetting
  • Firewalls
  • Virtual Local Area Networks (VLANs)
  • Access Control Lists (ACLs)
  • Demilitarized Zones (DMZs)

Sources for More Information

  • Cisco Systems – A leading networking company with comprehensive resources about network segmentation.
  • Check Point Software Technologies – A cybersecurity company with expertise in endpoint and mobile security, as well as network segmentation.
  • VMware – A virtualization and cloud computing company with resources about virtualization-based network segmentation techniques.
  • Norton by Symantec – A reputable cybersecurity company with informative articles about network segmentation best practices.

About The Authors

The DevX Technology Glossary is reviewed by technology experts and writers from our community. Terms and definitions continue to go under updates to stay relevant and up-to-date. These experts help us maintain the almost 10,000+ technology terms on DevX. Our reviewers have a strong technical background in software development, engineering, and startup businesses. They are experts with real-world experience working in the tech industry and academia.

See our full expert review panel.

These experts include:


About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

More Technology Terms

Technology Glossary

Table of Contents