It’s main function is to transfer network packets from the source to the destination. The network layer provides services to direct packets to a destination host on another network. Tweet. The network layer is an important layer in the OSI model because some of the important concepts it applies, including IP addressing, connection model, message forwarding etc. The Ultimate Guide to TCP/IP. How the Application Layer … To travel to other networks, the packet must be processed by a router. we will also discuss the Design issues with Network Layer and the working of Network Layer with the help of its diagram and an example. It hides to the transport layer all the complexity of the underlying subnetworks and ensures that information can be exchanged between hosts connected to different types of subnetworks. 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 Network Access Layer is just one layer of the TCP/IP model, however- and in our next section we will be taking a closer look at logical addressing at its finest- the Internet Layer! Network layer is the third layer in the OSI model of computer networks. Protocols that may be present in the Network Layer include the Datagram Delivery Protocol (DDP), Internet Control Message Protocol (ICMP), Internet Group Message Protocol (IGMP), and Internet Protocol Security (IPsec). The network layer is the glue between these subnetworks and the transport layer. The TCP/IP Stack and the OSI Model. The Network Layer handles the task of routing network messages from one computer to another. A key element of this layer is that each network in the whole web of networks is assigned a network address; and such addresses are used to route packets (which is covered under the topics of Addressing and Switching, explained later on). Data is transferred in the form of packets via logical network paths in an ordered format controlled by the network layer. Layer 3 mapping scans for IPs of devices and determines the networks and subnets they're associated with to build out the Layer 3 map. The network layer uses various routing algorithms to guide data packets from a source to a destination network. The role of the router is to select paths for and direct packets toward the destination host in a process known as routing. Layer 3: The Network Layer. Layer 3, or Network Layer, switching takes place when a packet arrives on one router interface and is forwarded on to another. Description and Functions of Network Layer in the OSI model: In this tutorial, we are going to learn what the Network layer is and the Functions of Network Layer in the OSI model in Computer Networking. Submitted by Monika Jha, on October 02, 2019 The network layer is the third level of the Open Systems Interconnection Model (OSI Model) and the layer that provides data routing paths for network communication. While Layer 2 is the data link layer of your network, Layer 3 uses IP addresses to communicate between network infrastructure. Layer 3 provides the network’s routing and switching technologies that create logical paths known as virtual circuits (VC), which are used for the transmission of data between network nodes. The two most popular Layer-3 protocols are IP (which is usually paired with TCP) and IPX (normally paired with SPX for use with Novell and Windows networks). Related Posts. The third layer of the OSI Model, the network layer, is where most network engineers focus their time and expertise. It is involved both at the source host and the destination host.

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