On operating systems like Windows or Linux, there is an invaluable tool called the traceroute command (on Windows, the equivalent command is called tracert). This command-line tool enables system administrators or network engineers to troubleshoot common networking issues.
Administrators use a traceroute to probe for bottlenecks whenever a user complains that connection to a website or server is slow. In addition, the traceroute command is used if a server is unreachable as it will show which particular part of the network route is problematic.