What is the purpose of implementing a DMZ in a network according to PCI-DSS?

Implementing a DMZ (Demilitarized Zone) in a network serves a crucial role in enhancing security, particularly in compliance with PCI-DSS (Payment Card Industry Data Security Standard). The primary purpose of a DMZ is to limit inbound traffic to authorized services. By placing public-facing servers, such as web servers, in the DMZ, organizations can control access and reduce the attack surface for potential intruders.

Increased security is achieved through the segmentation of the internal network from external networks. The DMZ acts as a buffer zone, allowing only specific, controlled connections to the internal network. This setup means that even if an attacker compromises a server in the DMZ, they will face additional barriers before reaching sensitive internal data or systems. Thus, the DMZ effectively limits unauthorized access and helps safeguard the integrity of the internal network, aligning with the goals of PCI-DSS to protect cardholder data.

The other choices do not align with the primary function of a DMZ in terms of security priorities dictated by PCI-DSS. The focus of a DMZ is not on increasing internal network speed, creating a backup network, or managing redundant connections, which may have their own operational benefits but do not address the critical security measures outlined by PCI-D