Final answer:
For network monitoring to function correctly, a PC and network card must be in promiscuous mode. So, option C is correct.
Step-by-step explanation:
For network monitoring to work properly, a PC and network card must be running in promiscuous mode. This mode allows the network card to pass all traffic it receives to the CPU rather than just the frames that are addressed to it. It is a special mode used for packet sniffing that takes control of all traffic available on a network segment. Network administrators utilize this mode for monitoring and analyzing network traffic to diagnose or investigate network issues or for network traffic analytics.
Promiscuous mode is critical for tasks such as network traffic analysis and intrusion detection systems, where capturing all network packets is essential for the operation. It is a security-relevant feature, and careful consideration must be applied whenever it's used to prevent unauthorized network monitoring.
When monitoring network traffic, such as with packet sniffers or network analyzers, promiscuous mode enables the capturing of data packets not explicitly addressed to the monitoring device. This is essential for diagnosing network problems, detecting anomalies, and ensuring the overall security and performance of the network by providing comprehensive visibility into the data flowing through it.