What tool is used by network administrators to capture packets from a network?

Network administrators utilize packet capture tools to monitor and analyze network traffic, and one of the primary tools for this purpose is a packet sniffer. A packet sniffer is software or hardware designed specifically to intercept and log traffic that passes over a digital network or part of a network. By capturing packets, administrators can analyze the data being transmitted, diagnose network issues, evaluate performance, and ensure security compliance.

The reason a packet sniffer is essential for network administration is that it provides deep insights into the network's functionality. It allows for the capture of data packets, which contain information about the source and destination of network communication, as well as the protocols being used. This visibility is crucial in troubleshooting and maintaining optimal network performance.

Other tools like firewalls, routers, or switches serve different primary functions in the network ecosystem. Firewalls focus on monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. Routers are essential for directing data packets between different networks, while switches connect devices within the same network. However, none of these tools are primarily focused on packet capture like a sniffer is, emphasizing the unique role of packet sniffers in network management and monitoring.