As Tufin stated in a white paper on this topic: "Segmentation is the division of an organization's network into a smaller group of interfaces and therefore more manageable." In other words, network segmentation essentially uses and isolates a network of connected assets to increase security and manageability.
One of the main goals of network segmentation is to limit the damage caused by attacks on an organization's network, especially attacks by insider threats. Without strong network segmentation, any threat beyond perimeter defense can affect the entire network.
Best practices for network segmentation: Conduct regular network checks
You cannot adequately isolate and protect what you don't know. Regular network reviews are a must for any in-depth defense strategy. Otherwise, there is a risk that some endpoints and network connections will be lost and security breaches occur that an attacker could exploit.
Performing frequent network checks to identify new assets added to the network is one of the most effective network security best practices to fix security gaps in your organization. Therefore, carry them out regularly.
Best practice # 2 for network segmentation: Consolidate similar resources into one database
When preparing to implement a network segmentation strategy, it can be helpful not only to review all of the data in the network, but also to consolidate similar data and resources into individual databases. This makes it easier for you to create a policy with the least privileges and to protect additional confidential information.
Suppose you have customer information that only a few people in your company need to access. Instead of having this data on dozens of workstations, it is better to consolidate it into a single, well-protected database to increase security.
This requires fewer resources than trying to protect dozens of endpoints, and allows you to take more stringent security measures without affecting overall network performance or the user experience.
By defining which resources are "similar" for consolidation purposes, you can sort the data by type and level of sensitivity.
Recommended practice ° 3 for network segmentation: creation and isolation of access portals for certain providers.
Most organizations work with different providers to meet their different needs. From HVAC repair providers to supply chain providers to providers of specific software licenses, the list of specialists that a company could hire for services is endless. While not all providers need access to your company's backend, some may need to access their systems to provide services.
When creating access portals for external providers in your network, it is important to block them as much as possible and only grant access to the resources they need to fulfill their role in your company. This helps to limit the possible impact of a security breach on the organization of the provider.
For example, if the provider is breached and you have full access to their systems, the attacker could also breach your network. However, if the provider's access is limited to a few systems that are isolated from the rest of their network, the harm is likely not to be serious.Please check here for more info on managed firewall services