Which OSI layer is identified as Layer 3 in the model?

Which OSI layer is identified as Layer 3 in the model?

• A. Network Layer
• B. Transport Layer
• C. Session Layer
• D. Application Layer

Answer: (A)

Layer 3, the Network Layer, is where routing and logical addressing happen. It moves packets between different networks by determining the best path from source to destination and forwarding them through routers based on IP-like addresses. This layer sits between the data-link layer, which handles a single network segment, and the transport layer, which provides end-to-end reliability and flow control. In practice, IP routing and routers operate at this layer, making Layer 3 the one responsible for inter-network delivery.

Layer 3, the Network Layer, is where routing and logical addressing happen. It moves packets between different networks by determining the best path from source to destination and forwarding them through routers based on IP-like addresses. This layer sits between the data-link layer, which handles a single network segment, and the transport layer, which provides end-to-end reliability and flow control. In practice, IP routing and routers operate at this layer, making Layer 3 the one responsible for inter-network delivery.