Which addressing is used to send information from one network to another network?

• A. Multicast
• B. Logical/IP
• C. Physical/MAC
• D. Broadcast

Answer: (B)

Sending data between networks relies on logical addressing with IP addresses. IP addresses identify devices across different networks and are used by routers to determine where to forward each packet. This routing happens at the network layer, the part of the stack designed for inter-network communication. Within a single local network, devices use MAC addresses to deliver frames on the local link, but those hardware addresses aren’t used to route across networks. When a packet moves toward its destination on another network, routers examine the IP destination and forward accordingly, possibly through multiple hops, until the packet reaches the correct network. Once on the target network, the final delivery to the device uses the local (MAC) address. Broadcast and multicast refer to delivering to multiple devices, often within a single network, and don’t provide the universal mechanism for cross-network routing. So the addressing that enables sending information from one network to another is IP addressing.