What is the unique address that identifies a device on the internet or local network?

What is the unique address that identifies a device on the internet or local network?

• A. MAC address
• B. IP address
• C. Ports
• D. Modem

Answer: (B)

The primary thing this question tests is how devices are identified on a network for routing and communication. An IP address is the unique identifier assigned to a device on a network or the internet, allowing routers to deliver packets from one host to another across multiple networks. IP addresses can be IPv4 or IPv6 and may be public or private, with NAT often mapping private addresses to a single public one when sharing a connection. In contrast, a MAC address is a hardware identifier tied to a network interface card and used within a local network segment to deliver frames, not for routing across the internet. Ports are not addresses; they specify which service (like a web server or email) a device should use. A modem is a device that provides connectivity, not an address. So the address that uniquely identifies a device on the internet or local network is the IP address.

The primary thing this question tests is how devices are identified on a network for routing and communication. An IP address is the unique identifier assigned to a device on a network or the internet, allowing routers to deliver packets from one host to another across multiple networks. IP addresses can be IPv4 or IPv6 and may be public or private, with NAT often mapping private addresses to a single public one when sharing a connection. In contrast, a MAC address is a hardware identifier tied to a network interface card and used within a local network segment to deliver frames, not for routing across the internet. Ports are not addresses; they specify which service (like a web server or email) a device should use. A modem is a device that provides connectivity, not an address. So the address that uniquely identifies a device on the internet or local network is the IP address.