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A Demilitarized Zone (DMZ) in network security refers to a physical or logical subnetwork that contains an organization's external-facing services, such as web servers, mail servers, and other resources that must be accessible from the internet. The primary purpose of a DMZ is to act as an additional layer of security between the internet and a company's internal network.

The correct use of a DMZ specifically involves isolating the elements of a network that are exposed to external attacks. By placing these elements in a DMZ, any potential threats or attacks from external sources are contained within this zone, preventing them from directly accessing the internal network. This isolation creates a buffer zone, which helps protect sensitive internal resources while still allowing legitimate traffic to reach the external-facing services. Security devices, such as firewalls, control the traffic flow into and out of the DMZ, further enhancing security by monitoring and filtering traffic.

While the other choices may touch on aspects of network security, they do not accurately define the specific purpose of a DMZ. For instance, securing all private networks is a broader task that does not specifically involve the concept of a DMZ. Monitoring network traffic is an important security practice, but does not directly relate to the isolation function that the