Discussion
Which layer of the OSI model is responsible for routing ?
Answer: C
Routing is the job of the Network Layer.
The network layer (layer 3 of the OSI model) provides logical addressing, such as IP addresses, and chooses the path a packet takes from source to destination across interconnected networks. Routers are layer-3 devices.
The data link layer (layer 2) moves frames between neighbouring nodes on one link, using MAC addresses. The transport layer (layer 4) gives end-to-end delivery between processes, with reliability and flow control in TCP. The application layer (layer 7) provides services such as HTTP and SMTP to user programs.
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