Tracert is used to show several details about the path that a packet takes from the PC to the destination specified. This command can be used for troubleshooting purposes to find out where a packet stopped on the network. It is able to show you the series of routers used between source and destination PCs. If a router is faulty or not functioning, this command can show you the last router it was able to successfully communicate to and thus, you will be able to find out which router is not working.