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Network Segmentation For Security

network segmentation concept

Network segmentation is a fundamental cybersecurity practice that involves dividing a computer network into smaller, isolated segments or subnetworks. Each segment is created to enhance security by isolating different types of data, systems, or user groups from each other. The primary goal of network segmentation is to reduce the attack surface, limit lateral movement of attackers, and contain the impact of a potential breach.

As a Managed IT Services Provider in Toronto, with a special focus on IT security and compliance for SMB’s, we will walk you through an overview of the types and benefits of network segmentation for small business and how it can help you. Let’s start with why – the benefits!

Benefits Of Network Segmentation

As you can imagine, breaking up data and access based on need and importance has several benefits. These strategies assist with:

  • Improved Security: By separating critical assets from less sensitive resources, we reduce attack surface so that attackers have a limited scope for lateral movement if they breach one segment.
  • Access Control: Segmented networks allow for more precise control over who can access specific resources, reducing the risk of unauthorized access.
  • Compliance: Network segmentation can help organizations comply with industry-specific regulations by isolating sensitive data.
  • Reduced Lateral Movement: In case of a breach, attackers find it harder to move laterally from one segment to another, slowing down their progress.
  • Traffic Isolation and Performance: Segmentation can improve network performance by isolating and optimizing traffic within each segment.
  • Breach Containment: If a segment is compromised, other segments remain unaffected, minimizing the overall impact.

Types Of Network Segmentation

Here are some common types of network segmentation that we use here at TUCU to help our small business clients with their IT security services and needs.

Internal Segmentation:

This involves dividing an internal network into isolated segments. It can be further categorized into:

  • Departmental Segmentation: Different departments or teams are placed in separate segments.
  • Functional Segmentation: Different functions, such as HR, finance, and engineering, are isolated.
  • Server/Service Segmentation: Servers and services are placed in separate segments based on their roles.

External Segmentation:

This involves isolating parts of the network that interact with external entities, such as guests or third-party vendors. It is commonly used for guest Wi-Fi networks or partner access.

Perimeter Segmentation:

Creating separate segments for different external-facing services (e.g., web servers, email servers) to minimize their exposure to potential attacks.

Logical Segmentation:

This involves creating virtual segments within a single physical network using techniques such as VLANs (Virtual Local Area Networks) and subnetting. It helps segregate traffic based on different network requirements.

Physical Segmentation:

Involves using separate physical network infrastructures, such as separate cables or switches, to create distinct segments. This provides an added layer of isolation and security.


A more granular approach that segments the network down to the individual device level. It is often used in data center environments to isolate workloads and applications.

Use Cases

Guest Networks: Many organizations create separate guest networks to provide internet access to visitors while keeping them isolated from internal resources.

IoT Devices: Internet of Things (IoT) devices often have varying levels of security. Segmentation ensures that compromised IoT devices cannot easily access critical systems.

Sensitive Data Security: Segregating databases containing sensitive customer data from general corporate networks helps protect sensitive information.

Development and Testing: Network segmentation can isolate development and testing environments from production systems, reducing the risk of unintended impacts.


Maintenance: Regular updates, patches, and security configurations must be maintained across all segments.

Complexity: Managing and configuring segmented networks can be complex, especially as the network grows and changes.

Communication: Segmentation can potentially hinder communication between legitimate systems if not properly planned.

Network segmentation is a crucial component of a defense-in-depth strategy, enhancing overall cybersecurity posture by limiting the impact of potential breaches and reducing the likelihood of un authorized access. It’s beneficial, worth the undertaking, and best performed by experienced professionals.

How To Plan MicroSegmentation On Your Network

Implementing microsegmentation involves creating highly granular network segments that isolate individual devices or workloads. This advanced security practice enhances your organization’s ability to control communication between different components within your network. Here’s a step-by-step guide to help you implement microsegmentation effectively:

1. Define Goals and Scope

– Identify the specific assets, devices, or workloads you want to segment.
– Determine the goals of microsegmentation, such as enhancing security, improving compliance, or isolating critical resources.

2. Inventory and Classification:

– Create an inventory of all devices, applications, and services in your network.
– Classify assets based on their sensitivity, purpose, and communication requirements.

3. Design Network Architecture:

– Map out your network architecture, including existing VLANs, subnets, and communication flows.
– Design the microsegments based on your inventory and classification.

4. Select a Microsegmentation Solution:

– Choose a microsegmentation solution that aligns with your organization’s needs. Some options include VMware NSX, Cisco ACI, or cloud-native solutions like AWS VPC Security Groups.

5. Policy Creation:

– Define segmentation policies that specify which devices or workloads are allowed to communicate with each other.
– Implement policies based on the principle of least privilege-only allow necessary communication.

6. Implementation:

– Deploy the chosen microsegmentation solution within your network infrastructure.
– Configure security groups, firewall rules, and access controls according to your defined policies.

7. Testing:

– Thoroughly test communication between microsegments to ensure that necessary connections are maintained and unauthorized communication is blocked.

8. Monitoring and Management:

– Set up continuous monitoring to detect any anomalies or policy violations within the microsegments.
– Implement logging and auditing to track communication patterns and potential security incidents.

9. Training and Documentation:

– Educate your IT staff on how to manage and maintain microsegmentation rules and policies.
– Create documentation outlining the purpose, configuration, and policies of each microsegment.

10. Regular Review and Update:

– Periodically review and update your microsegmentation policies as your network evolves, new devices are added, or communication requirements change.

11. Consider Automation:

– Leverage automation tools to help manage and enforce microsegmentation policies, especially in dynamic environments.

12. Incident Response Planning:

– Develop an incident response plan that includes procedures for addressing security incidents within microsegments.

13. Compliance and Documentation:

– Ensure that your microsegmentation implementation aligns with any regulatory requirements your organization must meet.
– Document your microsegmentation strategy, policies, and procedures for future reference.

Implementing microsegmentation requires careful planning, coordination, and ongoing management. While it offers enhanced security, it can also introduce complexity. Therefore, a well-executed implementation with a focus on policy definition, testing, and monitoring is crucial to realizing its benefits effectively.

As a small business IT support company in Toronto, we have been designing, building, monitoring and managing cloud and IT networks since 2003. We ae well versed in network segmentation and would be happy to help you achieve your network security goals. Reach out to us today!


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