Which workstation utility could you use to find out which router is causing this problem?

To identify which router is causing a problem, you can use the "traceroute" utility. This tool traces the path that packets take from your workstation to a specified destination, displaying each hop along the way, including the routers they pass through. By analyzing the output, you can pinpoint where the delays or failures occur, helping to isolate the problematic router. Additionally, "ping" can be used to test connectivity to specific routers along the path.