A mission-critical server has a faulty PCI-X network interface card. Which NIC can be immediately substituted?

In this scenario, the substitution of a network interface card (NIC) for a mission-critical server requires compatibility with the existing system. The correct choice is a 33 MHz 3.3V PCI NIC because it adheres to a fundamental standard of PCI technology that allows it to work in PCI-X slots.

While a PCI-X network interface card (like options C and D) may offer better performance due to their higher bandwidth capabilities, they are specifically designed for systems that support PCI-X specifications. If the functional card is PCI-X, a NIC that adheres to PCI specifications can operate within the same environment, albeit at reduced performance levels.

The 33 MHz 3.3V PCI card is also an older technology but remains compatible due to its voltage and data transfer rate specifications. It can physically fit and function in the server, allowing for a quicker technical resolution by replacing the faulty NIC without requiring additional changes to the server's architecture or settings.

In contrast, the 66 MHz 5V PCI option is not compatible because of its different voltage and interface specifications, which do not align with PCI-X architecture. Therefore, while higher-performance PCI-X cards are available, if immediate substitution is necessary without upgrade or redesign of the existing infrastructure, the