Question

a(n) ___ uniquely identifies every network - connected device in the world.
a vpn
b gateway
c mac address
d hub

Explanation:

• A VPN (Virtual Private Network) is used for secure remote access to a network, not for uniquely identifying devices.
• A gateway is a device that connects different networks, not for unique device identification.
• A MAC (Media Access Control) address is a unique identifier assigned to network interfaces for communications on the physical network segment.
• A hub is a simple network device that connects multiple devices but does not uniquely identify them.

Answer:

C. MAC address