What type of tool is used to capture and display Ethernet communications?

The correct answer is a packet capture. This tool is specifically designed to capture, analyze, and display data packets that are transmitted over Ethernet communications. Packet capturing tools work by intercepting the data packets flowing through a network and can provide detailed insights into the contents of these packets, including the headers and payloads. This allows users to monitor network traffic, troubleshoot issues, and analyze performance or security concerns in real-time.

In contrast, a vulnerability assessment tool focuses primarily on identifying and evaluating security vulnerabilities within a network or system rather than capturing communication data. Port mirroring is a technique used to send a copy of network packets to a monitoring port for analysis but does not perform analysis itself; it simply facilitates the data flow to another tool like a packet capture. A network analyzer can refer to various tools or software that analyze network traffic, but it often implies a broader functionality that includes packet capturing as a component, whereas "packet capture" specifically denotes the act of intercepting and storing packets for analysis.