In the OSI model, which layer is responsible for routing packets across different networks using logical addressing?
Network Layer
The OSI reference model organises network communication into seven layers, each with a defined responsibility, and moving data between two physically separate networks is the job of one specific layer.
The Network Layer (Layer 3) is responsible for logical addressing and routing: it assigns and uses logical addresses such as IP addresses, and it selects the best path so that packets can travel from a source network to a destination network.
Routers operate at this layer, examining the destination IP address of each packet and forwarding it toward the correct next network, which is precisely the routing behaviour the question asks about.
The Data Link Layer (Layer 2) uses hardware MAC addresses and only moves frames within a single local network segment, so it cannot route across different networks.
The Session Layer (Layer 5) sets up, controls and tears down the dialogue between two applications; it manages conversations, not packet routing.
The Transport Layer (Layer 4) provides end-to-end delivery with segmentation and reliability (as TCP does), but it does not choose routes between networks.
Because routing packets across networks using logical addressing is the defining role of Layer 3, the correct answer is the Network Layer.
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