An internetworking device is a widely-used term for any hardware within networks that connect different network resources. When a device has multiple paths to reach a destination, it always selects one path by preferring it over others. Protocol Layering d Needed because communication is complex d Intended primarily for protocol designers Hub Hub is one of the basic icons of networking devices which works at physical layer and hence connect networking devices physically together. Protocol Layering and Layering Models. The network layer performs addressing to find out the specific devices on the network. Network services are protocols that work with the user's data. B. Layer 3 (Network Layer) C. Layer 4 (Transport Layer) D. Layer 7 (Application Layer) Click Here for Answers 1 – D / 2 – C / 3 – D / 4 – B / 5 – C / 6 – C / 7 – A / 8 – D / 9 – A / 10 – B Multiple Choice Questions of Computer Networking 2-1 Each IP packet must contain A. Two Key Network-Layer Functions! Network topology considerations For a fully connected local area network (LAN), this is done by datalink layer. Network layer takes the responsibility for routing packets from source to destination within or outside a subnet. The services should be independent of the router technology. The Network Layer is the third layer of the OSI model. Use the Layers panel to examine layers and show or hide the content associated with each layer. Items on locked layers cannot be hidden. The network layer translates the logical addresses into physical addresses 2. This selection process is termed as Routing. Almost all link-layer protocols encapsulate each network-layer datagram within a network-layer datagram is inserted, and a number of header fields. 2. This is done by using a routing table. It divides network communication into seven layers. Network Layer - OSI Model. Some well-known protocols for the data link layer include High-level Data Link Control (HDLC), LAN drivers and access methods such as Ethernet and Token Ring, and the LAP-D protocol in ISDN networks. Within the service layering semantics of the OSI network architecture, the network layer responds to service requests from the transport layer and issues service requests to the data link layer . The layers that appear in the PDF are based on the layers created in the original application. Advertisements. The network layer is the third level (Layer 3) of the Open Systems Interconnection Model (OSI Model) and the layer that provides data routing paths for network communication. —Network Layer adalah lapisan ketiga dari Open Systems Interconnection model(OSI Model) dan lapisan yang menyediakan routing jaringan komunikasi. If two systems are attached to different networks with devices like routers, then N/W layer is used. Addresses at Layers Physical Layer: no address necessary Data Link Layer - address must be able to select any host on the network (MAC). Network Layer It is responsible for the source to destination delivery of a packet across multiple networks. 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. Computer Networks Notes Pdf Material – CN Notes Pdf. The third layer of OSI model is the Network Layer. View the network layer.pdf from ITSC 3146 at University of North Carolina, Charlotte. Network Layer - address must be able to provide information to enable routing (IP). CS3201 Computer Networks Socket Programming Dr Peter Robinson peter.robinson@cityu.edu.hk Slides based on book 78 The Network Layer 79 What does the network layer do? View Network Layer (Data Plane)-1.pdf from CS 3201 at City University of Hong Kong. Physical layer: ensures a safe and efficient travel of data; consists of electronic circuits for data transmission etc. This feature is accomplished by Internet Protocol (IP). Layer 4 (Application): Also called the Process layer, this layer combines the OSI model’s L5, L6, and L7. • Connection service: before datagrams flow, two end hosts and intervening routers establish virtual connection (VC)! Chapter 5 ­ The Network Layer Objective Move packets from source machine to destination machine. Key devices that comprise a network are routers, bridges, repeaters and gateways. A data-link protocol specifies the structure of the frame, as well as a channel access protocol that specifies the rules by which a … Network Layer: Logical addressing, internetworking, tunneling, address mapping, ICMP, IGMP, forwarding, uni-cast routing protocols, multicast routing protocols. 6 Network Layer 4-11 Virtual circuits call setup, teardown for each call before data can flow each packet carries VC identifier (not destination host address) every router on source-dest path maintains “state” for each passing connection link, router resources (bandwidth, buffers) may be allocated to VC “source-to-dest path behaves much like telephone circuit” It also takes care of packet routing i.e. Network layer manages options pertaining to host and network addressing, managing sub-networks, and internetworking. This layer takes data segment from transport layer and adds logical address to it. The sender & receiver’s IP address are placed in the header by the network layer. 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