netstat is a command-line tool that displays network connections, routing tables, interface statistics, and more. It can help the technician identify which processes or applications are using the network bandwidth on the user's computer. netstat can also show the current bandwidth usage in bytes per second for each network interface. Reference netstat - Wikipedia provides an overview of the netstat tool and its features. How to get current bandwidth usage from command line using built-in Linux tools? - Super User explains how to use netstat and other tools to monitor bandwidth usage on Linux systems. Get network utilization from command line - Super User shows how to use typeperf and other tools to monitor bandwidth usage on Windows systems.