In a scenario where a network is designed to prevent unauthorized access, which approach is typically implemented?

In a scenario aimed at preventing unauthorized access to a network, segmentation is a key approach because it involves dividing a network into distinct segments or zones. This division enhances security by isolating sensitive areas of the network from less secure zones. Each segment can have its own security controls, making it harder for unauthorized users or malicious actors to traverse the entire network.

By implementing segmentation, organizations can ensure that access is granted based on role, function, or need-to-know criteria. This means that even if a breach occurs in one segment, it doesn't necessarily compromise the entire network. Segmentation also aids in monitoring and controlling traffic flow, allowing for more effective detection and response to potential security threats.

While other approaches like captive portals, access control policies, and firewalls also play important roles in network security, segmentation specifically focuses on limiting the movement of users across network boundaries, which directly contributes to the prevention of unauthorized access. Each of these other options supports security, but segmentation stands out in its ability to create isolated environments within a network, enhancing the overall security posture.