What is the numerical label assigned to each device connected to a computer network or the internet called?

• A. IP Address
• B. MAC Address
• C. Hostname
• D. Domain

Answer: (A)

The label used to identify each device for routing data on a network is the IP address. This numeric identifier lets the Internet Protocol know where to send packets, whether the device is on a local network or somewhere across the internet. IP addresses come in two forms: IPv4, like 192.168.0.2, and IPv6, like 2001:0db8:85a3:0000:0000:8a2e:0370:7334.

MAC addresses are hardware identifiers tied to a network interface card and are used mainly within a local network segment for data-link delivery, not for routing across networks. A hostname is a human-friendly label for a device that DNS translates into an IP address, while a domain refers to a DNS domain like example.com, part of naming rather than the device’s numeric address.