When is a crossover cable necessary when configuring a device?
Local configuration of a device can be done by connecting a PC serial connector to the console connector on the device. The PC is a DTE. If the device is a DCE, a crossover cable is necessary. You will not always know if a device you are configuring is set up as a DCE so you may have to first try a crossover cable and if that does not work, a direct cable.