Which of the following identifies the hardware address of a device in a network?

The hardware address of a device in a network is identified by its MAC address. A MAC (Media Access Control) address is a unique identifier assigned to network interfaces for communications on the physical network segment. Unlike IP addresses, which can change based on the network being used, a MAC address is typically fixed to the hardware of a device, making it a reliable means of identifying devices within a local network.

In contrast, IP addresses are logical addresses that can change depending on the network configuration and are used for routing traffic across different networks. DNS names are human-readable addresses that are translated into IP addresses, and URLs are specific types of web addresses used to access resources on the internet. None of these alternatives serve the same purpose as a MAC address in terms of identifying devices at the hardware level.