Which zone acts as a barrier between internal networks and the internet, providing a controlled boundary?

Which zone acts as a barrier between internal networks and the internet, providing a controlled boundary?

• A. Internet Zone
• B. Production Network Zone
• C. Internet DMZ
• D. Management Network Zone

Answer: (C)

A DMZ (demilitarized zone) serves as a controlled buffer between the trusted internal network and the untrusted internet. It hosts services that must be reachable from outside (like web or mail servers) while keeping the internal network protected behind additional firewall rules. Traffic from the internet to these DMZ hosts is tightly controlled, and access from the DMZ to the internal network is restricted, often requiring separate firewall policies to permit only what’s necessary. This setup means that if a service in the DMZ is compromised, the attacker doesn’t automatically have direct access to internal systems. The other zones don’t fit this role. An Internet Zone would sit on the internet side without buffering internal resources. A Production Network Zone is an internal segment, not the exposed boundary. A Management Network Zone is dedicated to administration and monitoring, not the public boundary to the internet.

A DMZ (demilitarized zone) serves as a controlled buffer between the trusted internal network and the untrusted internet. It hosts services that must be reachable from outside (like web or mail servers) while keeping the internal network protected behind additional firewall rules. Traffic from the internet to these DMZ hosts is tightly controlled, and access from the DMZ to the internal network is restricted, often requiring separate firewall policies to permit only what’s necessary. This setup means that if a service in the DMZ is compromised, the attacker doesn’t automatically have direct access to internal systems.

The other zones don’t fit this role. An Internet Zone would sit on the internet side without buffering internal resources. A Production Network Zone is an internal segment, not the exposed boundary. A Management Network Zone is dedicated to administration and monitoring, not the public boundary to the internet.