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What does the vane form do? Where does it sit in relationship to the other four storeys of our simplified net profit model? web layer is the third layer of the OSI model. It performs switching androuting by creating logical paths, cognize asvirtual circuits, for deputering data from unitary node to another node. Routing and publicity are the major lives of this layer. It as well performs other operations such asaddressing, inter lucreing, computer error handling,congestion,control and packet sequencing.It maintains the quality of service requested by the transportation layer. It determines how data are transferred between web devices. It Routes packets according to singular network device addresses and Provides flow and congestion control to prevent network resource depletion. The network layer provides the functional and procedural means of transferring variable distancedata sequences from a source to a destination soldiers via one or more networks while maintaining thequality of serviceanderror control functions.At this layer, the computer system engages in a confabulation with the network to specify the destination address and to request certain network facilities, such as priority net income Layer consists of three hired gun layers Sub network Access This layer considers protocols that deal with the interface to networks, such as X. 25. Sub network Dependent Convergence This layer is infallible to bring the aim of a transit network up to the level of networks on either side. Sub network Independent Convergence It handles transfer crosswise multiple networks. The major Functions of the network layer are RoutingThe well-nigh outstanding function of network layer is routing which includes Moving data across a series of inter combineed networks the network layer. At the network layer, the devices and computer software routines handles incoming packets from various sources, determines their final destination, and then transfers the data t o their destination. Logical Addressing any communication device in a network of an logical address, which is also called as layer three address. The earnings Protocol (IP) is the network layer protocol which is the best known example of network layer and every machine consists of its own IP address.It manages the connectionless transfer of data one hop at a time, from end system to ingress router, to router to router, and from military issue router to destination end system. It is not responsible for reliable delivery to a next hop, but only for the detection of eroded packets so they whitethorn be removed. Connection model The OSI Network Layer protocol stick out be either connection-oriented, or connectionless. In general, theTCP/IP Internet Layer supports only the connectionless Internet Protocol (IP). Message forwarding This is the almost important function of network layer.Since many networks are partitioned into sub networks and connect to other networks for wide-area com munications, networks use specialized hosts, called gateways orrouters to forward packets between networks. Datagram Encapsulation Network layer performs encapsulation of messages received from higher layers by placing them intodatagramswhich are also referred to as packets with a network layer header. Fragmentation and Reassembly The major function of the network layer is transmitting messages down to the data touch base layer. whatsoever data link layer technologies consist of certain limitations on the length of any message that can be sent.If the packet that the network layer wants to send is too large, the network layer has to fragment the packet in the lead transmitting it to data link layer. It transmits each piece to the data link layer. The fragmented pieces are then reassembled once they arrive at the network layer on the destination machine. Handling and Diagnostics At the network layer Special protocols are used to allow devices that are logically connected, or that a re trying to route traffic, to exchange information roughly the status of hosts on the network or the devices themselves.