- 2072 Kartik · 2 marks
Why network layer is key layer
Short answer
The network layer is key because it enables end-to-end delivery across heterogeneous networks using globally unique logical addresses. It performs routing, hides physical network differences, provides transport layer service interface, and handles fragmentation, congestion, and error reporting.
Network layer is one of the key layers in the OSI reference model, why?
The network layer is the key layer because it is the lowest layer that deals with end-to-end delivery across many networks. Layers below it work only between neighbouring nodes on one link.
- It gives every host a globally unique logical address (IP address), independent of the hardware used.
- It performs routing: selecting the path through many routers, which no other layer does.
- It hides the differences between LANs, WANs and technologies (Ethernet, Wi-Fi, PPP) by providing one common packet format.
- It provides the service interface used by the transport layer; if it fails, no host-to-host communication is possible.
- It handles fragmentation, congestion and error reporting so upper layers can ignore the internal topology.
✓ Answer checked by Claude Opus 5.5 (high effort)
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