Discussion
In networking, which device operates at Layer 3 of the OSI model and makes forwarding decisions based on IP addresses ?
Answer: A
The device is a Router.
A router works at the network layer (Layer 3). It reads the destination IP address in each packet, looks it up in its routing table and forwards the packet towards the destination network, connecting separate networks together.
Bridges and switches work at the data link layer (Layer 2) using MAC addresses, and a hub works at the physical layer (Layer 1), repeating signals. Some switches add Layer 3 routing, but the device defined by Layer 3 forwarding is the router.
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