Semester 4 / Computer Networks /Network Layer

Network Layer

1 min read Updated Sun May 03 2026 07:56:35 GMT+0000 (Coordinated Universal Time)
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Layer 3 of the OSI model. Responsible for delivering packets from a source host to a destination host across multiple networks. Provides addressing and routing mechanisms that allow packets to travel through intermediate routers.

Key functions:

  • Addresses hosts and network devices.
  • Establishes, maintains and terminates connection between hosts.
  • Determintes the path packets take through the network

Protocols

In the network layer:

  • Routing protocols such as RIP, Border Gateway Protocol and OSPF are used
  • IP is used to address hosts.
  • ICMP is used for error reporting and inter-router communication.

Internet Layer

The network layer of the Internet responsible for packet delivery across networks. The Internet uses essentially a single network-layer protocol (IP), unlike layered alternatives.