A technician wants to increase the reliability of a DHCP server. Which of the following components should be installed to increase the server's uptime on the network?

To enhance the reliability and uptime of a DHCP server on the network, installing redundant network interface cards (NICs) is a highly effective approach. By implementing redundant NICs, you create a failover mechanism that ensures continuous network connectivity. If one NIC fails or experiences issues, the other can take over without interrupting DHCP services, thereby minimizing downtime.

This solution is particularly valuable for critical infrastructure, such as DHCP servers, where maintaining consistent service is essential for network function. Redundant NICs can also help in load balancing, allowing a higher throughput and better resource utilization.

While boosting the amount of RAM can enhance overall server performance, it does not specifically address the issue of reliability in terms of network connectivity. Utilizing a lower voltage power supply might not impact the server's uptime significantly and could introduce other risks. Likewise, while a hardware firewall increases security and can protect the server from malicious attacks, it does not directly contribute to the inherent reliability of the DHCP service itself. Hence, adding redundant NICs stands out as the most effective choice for ensuring high availability of the DHCP server.