What does network segmentation aim to achieve?

Network segmentation is a critical practice in computer security that aims to enhance both performance and security by dividing a larger network into smaller, more manageable segments. This division allows organizations to contain and limit potential security breaches within smaller segments, thus preventing them from affecting the entire network. When one segment is compromised, the others can remain secure, minimizing overall risk.

Furthermore, segmentation can improve network performance by reducing congestion. By limiting broadcast traffic to specific segments, each segment can operate more efficiently, leading to faster response times and better resource allocation.

In contrast, combining all networks into one would negate the benefits of segmentation, as it would create a single point of failure and increase vulnerability. Decreasing the number of devices on a network doesn't directly relate to the goals of segmentation, as segmentation focuses on the structure rather than the total count of devices. Simplifying network management can be a secondary benefit of segmentation but is not its primary objective. Instead, the main goals are to enhance security and optimize performance, which is precisely what option B represents.