Explain how the trace route utility uses Internet Control Message Protocol (ICMP) Echo requests to trace the path from one networked node to another, identifying all intermediate hops between the two nodes. Provide an example trace route result. Explain what happens when an administrator issues the mtr command. Describe the function of the route utility and provide examples of how it is entered on a UNIX or Linux system, a Windows-based system, and a Cisco-brand router.