To convert a directory server's private IP address to its public IP address, which feature should a technician enable?

The correct answer is NAT, which stands for Network Address Translation. NAT is a crucial network feature that allows multiple devices on a local network to share a single public IP address for accessing the internet. In this context, the technician needs to convert the directory server's private IP address into a public IP address so that it can communicate with external networks effectively.

When NAT is enabled, it modifies the IP address information in the IP packet headers as the packets pass through a router or firewall, allowing private IP addresses to be mapped to a public IP address. This is particularly useful for securing internal network structures and minimizing the use of available public IP addresses.

In contrast, while the other features have their own uses, they do not perform the required conversion of IP addresses. A VPN (Virtual Private Network) is used to create a secure connection over the internet, DNS (Domain Name System) is responsible for resolving domain names into IP addresses, and a DMZ (Demilitarized Zone) generally refers to a buffer zone to add an extra layer of security to an organization's internal networks. None of these redirect or translate IP addresses like NAT does.