What is the network layer?

Located in ~ Layer 3 that the open Systems Interconnection (OSI) communications model, the primary function of the network class is to move data into and through various other networks. Network class protocols achieve this goal by packaging data v correct network address information, picking the appropriate network routes and forwarding the packaged data up the stack to the move layer (Layer 4).

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Existing protocols that normally map come the OSI network layer encompass the IP section of the Transmission manage Protocol/Internet Protocol (TCP/IP) version -- both IPv4 and also IPv6 -- as well as NetWare Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX). Almost all companies networks use the TCP/IP stack, and also cellular data networks, including 3G, 4G LTE and also most recently, 5G networks.

The routing information included within a packet includes the resource address that the sending out host and the eventual location host resolve of the far host. This info is had within the network class header the encapsulates network frames in ~ the data attach layer (Layer 2). The crucial difference -- and importance -- in between transport information consisted of at great 2 when compared to deliver information included at the network layer is the the information can move past the neighborhood network to with hosts in far network places or different network segments. The following network topology chart depicts tools in one IP subnet using Layer 3 routing to connect with gadgets in a 2nd IP subnet.

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exactly how Layer 3 of the OSI design works

Functions that the network layer

The primary role of the network great is to allow different networks to be interconnected. The does this by forwarding packets come network routers, which count on algorithms to identify the finest paths for the data to travel. These courses are known as "virtual circuits." The network layer depends on the Internet regulate Message Protocol (ICMP) because that error control handling and diagnostics to ensure packets are sent correctly. Top quality of organization (QoS) is also easily accessible to permit details traffic to it is in prioritized over various other traffic. The network layer have the right to support either connection-oriented or connectionless networks, yet such a network data transmission can only it is in of one form and no both.

What is the OSI model and its 7 layers?

OSI is a interactions reference design to aid conceptualize exactly how data deserve to be transmitted and received on a network. The model is composed of seven unique layers developing a stack. Every layer in the ridge is performed in a step-by-step manner: first, moving up the stack throughout data transmissions and also then from the optimal of the ridge down once the data get its destination. The great of the OSI model, including the network layer, are shown below:

The network class of the OSI version

Protocols at the network layer

While IP is the most popular and widely provided protocol in ~ the network class today, there space plenty of other protocol examples to note. Network protocols at Layer 3 encompass those used for dynamic routing of networks, secure communications, network translations and also network redundancy. Below are a couple of examples:

Hot Standby Router Protocol (HSRP) is a network path redundancy protocol. Virtual Router Redundancy Protocol (VRRP) is a network path redundancy protocol.
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