To answer this question, you need to understand the different diagnostic tools used to troubleshoot network issues. Let's go through each option to understand why it is correct or incorrect:
Option A) Multimeter - This option is incorrect because a multimeter is a tool used to measure voltage, current, and resistance in electrical circuits. It is not specifically designed to diagnose network interface card (NIC) issues.
Option B) Protocol Analyzer - This option is correct because a protocol analyzer is a diagnostic tool that captures and analyzes network traffic. It can help identify issues with a malfunctioning network interface card by examining the packets being sent and received by the card.
Option C) Signal Detector - This option is incorrect because a signal detector is used to detect and locate wireless signals, such as Wi-Fi or cellular signals. It is not specifically designed to diagnose network interface card issues.
Option D) Null Network Unit - This option is incorrect because a null network unit is a device used to simulate network connections and test network equipment. It is not specifically designed to diagnose network interface card issues.
Option E) Port Sniffer - This option is incorrect because a port sniffer, also known as a packet sniffer, is a tool used to capture and analyze network traffic. While it can help identify network issues, it is not specifically designed to diagnose network interface card issues.
The correct answer is B) Protocol Analyzer. This option is correct because a protocol analyzer is a diagnostic tool that captures and analyzes network traffic, helping to identify issues with a malfunctioning network interface card.