How can you implement network segmentation like a pro?

1 Assess your network

Before you start segmenting your network, you need to understand your current network architecture, topology, and traffic patterns. You can use tools like network scanners, analyzers, and mappers to collect and visualize data about your network devices, connections, and flows. You should also identify your network assets, such as servers, workstations, printers, and IoT devices, and classify them according to their role, function, and sensitivity. This will help you determine the best way to segment your network based on your business needs and security objectives.

2 Choose your segmentation method

There are various methods to segment your network, depending on the level and type of isolation you want to achieve. VLANs are logical segments that separate devices on the same physical switch or network based on their VLAN ID. Subnets are logical segments that separate devices on the same network based on their IP address and subnet mask. Firewalls are devices that filter and control traffic between different segments based on predefined rules. And VPNs are encrypted tunnels that connect remote devices or networks over the internet. All of these methods can help reduce broadcast domains, optimize routing, enforce security policies, protect data in transit, and enable remote access.

3 Design your segmentation strategy

Once you have chosen your segmentation method, you need to design your segmentation strategy based on your network assessment and segmentation goals. Factors to consider include the number and size of segments, the criteria and logic for grouping devices, the inter-segment communication and routing you want to allow or deny, the security policies and controls for each segment, and the monitoring and auditing tools to track and verify your segmentation.

4 Implement your segmentation plan

Once you have designed your segmentation strategy, it's time to implement your plan by configuring your network devices and components. It is important to document and backup your network configuration. Testing your segmentation plan in a lab or pilot environment prior to deploying it to production is also recommended. Furthermore, you should implement the plan gradually, starting with the least critical segments. Verifying the connectivity, performance, and security of each segment is essential, as is monitoring and troubleshooting with tools such as ping, traceroute, and netstat.

5 Review and update your segmentation

Network segmentation is not a one-time project, but an ongoing process that requires regular review and update. To implement network segmentation like a pro and enjoy the benefits of a more efficient, secure, and manageable network, you should evaluate the segmentation results and measure its impact on your network performance, manageability, and security. Additionally, collect and analyze feedback from your users, administrators, and stakeholders, identify any gaps or issues that arise from your segmentation, and adjust and optimize your plan as your network changes.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?