|  | 4.4 | Basic Networking Testing
| 4.4.8 | Checking real-time traffic with debug
The router includes hardware and software to aid it in tracking down problems, on it, or on other hosts in the network. The debug privileged EXEC command starts the console display of the network events specified in the command parameter. Use the terminal monitor command to forward debug output to your Telnet session terminal. In this example, data link broadcasts received by the router are displayed. Use the undebug all command (or no debug all) to turn debugging off when you no longer need it. Debugging is really intended for solving problems. (Note: Be very careful with this tool on a live network. Substantial debugging on a busy network will slow down the network significantly. Do not leave debugging turned on; use it to diagnose a problem, and then turn it off.) By default, the router sends system error messages and output from the debug EXEC command to the console terminal. Messages can be redirected to a UNIX host or to an internal buffer. The terminal monitor command gives you the capability to redirect these messages to a terminal.