What should be verified to ensure a DMZ is properly implemented?

To ensure a DMZ (Demilitarized Zone) is properly implemented, it is crucial to verify that inbound traffic is limited to specific authorized services. The purpose of a DMZ is to add an additional layer of security to an organization's internal network by creating a buffer zone between the public internet and the internal network. By allowing only specific authorized services to communicate through the DMZ, you minimize the attack surface and reduce the risk of unauthorized access to the internal network.

This controlled approach allows for necessary services to function, such as web servers or email servers, while preventing potentially malicious traffic from compromising the security of the organization's internal resources. Limiting inbound traffic to only what is needed helps to protect sensitive internal data and systems.

In contrast, allowing inbound traffic from all public networks or making all systems accessible to the public expands the potential for security breaches. Similarly, if no traffic is allowed in or out, it defeats the purpose of a DMZ, as it would not facilitate any services that need to be accessible while still providing an additional security measure.