In this lesson, Professor Wool presents a simple yet highly effective strategy to help you future proof your network segmentation policy against future changes. Using the concept of a diamond, Professor Wool shows how you can define very specific rules at each end point of the diamond and broader policies in the middle. This will significantly reduce the time and effort needed to work on change requests—without compromising on security in any way.

In this lesson, Professor Wool recommends a simple matrix to define network segments and security zones, and the traffic allowed to and from each zone. This matrix can then be used to immediately assess a firewall change requests as well as validate that existing security policies have been implemented correctly.

In this lesson, Professor Wool examines common missteps when organizations create security zones and best practices to consider for an improved defense.

In this lesson, Professor Wool provides recommendations for how to design your network for optimal segmentation in two typical scenarios: Allowing traffic from an external partner application into the corporate data center, and structuring network traffic flows within the data center to force specific flows with more check points for better security.

In this lesson, Professor Wool presents some of the challenges of setting up security policies for East-West traffic. On the one hand these policies need to allow all legitimate business traffic to flow through the data center, yet on the other hand they need to be very specific so as to block everything else. Watch this video to find out more.

Following on from Professor Wool’s previous lesson, this lesson presents a step-by-step process for writing firewall policies for East-West traffic. This involves an iterative process of discovering, identifying and then writing explicit ‘allow’ rules for all valid business traffic that goes through the network segment. Watch this video to find out more.