Final answer:
The items needed in the replacement of a failed device include replacement tools, backup devices, and spare parts.
Step-by-step explanation:
The items you will need in the replacement of a failed device include replacement tools, backup devices, and spare parts. These items are essential for efficiently replacing a failed device and restoring functionality to your network. Replacement tools such as screwdrivers and cable testers will be needed to physically replace the device. Backup devices such as spare routers or switches can be used temporarily while the failed device is being replaced. Spare parts such as network cables or power supplies may be needed to ensure a smooth replacement process.