This happens often. An information worker notifies the help desk that their computer is offline. The technician embarks on a series of troubleshooting steps: verify the fault, eliminate user error, try turning the computer off and on again. On most occasions those steps solve the problem. But once in a while, the network really is down. No ping reply from the IP address. No link light on the network interface card. Really, a broken connection. And now it's necssary to find the fault and fix it, or bypass it.