Network Layer | Layer 3 | The OSI-Model

OSI Layer 3 – Network Layer

In the seven-layer OSI model of computer networking, the network layer is layer 3. The network layer is responsible for packet forwarding including routing through intermediate routers, since it knows the address of neighboring network nodes, and it also manages quality of service (QoS), and recognizes and forwards local host domain messages to the Transport layer (layer 4). The data link layer (layer 2) is responsible for media access control, flow control and error checking.

The network layer provides the functional and procedural means of transferring variable-length data sequences from a source to a destination host via one or more networks, while maintaining the quality of service functions.

Wikipedia

Functions

• Connection model

• Host addressing

• Message forwarding

Popular Network Layer Protocols

DDP

Datagram Delivery Protocol

DVMRP

Distance Vector Multicast Routing Protocol

ICMP

Internet Control Message Protocol

IGMP

Internet Group Management Protocol

IPsec

Internet Protocol Security

IPv4/IPv6

Internet Protocol

IPX

Internetwork Packet Exchange

PIM-DM

Protocol Independent Multicast Dense Mode

PIM-SM

Protocol Independent Multicast Sparse Mode

RSMLT

Routing Information Protocol

Shortest Path Bridging

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