Network Layer - Addresses & Routing
layer 4-7 router
The physical layer in the OSI Model. For TCP/IP, this applies to the IP packet that contains the IP destination address, IP source address and ToS byte. See also Layer 2.
the path control layer, which routes packets through an inter-network and can subdivide datagrams and reassemble them to accommodate the transmission facilities.
In OSI Model terms, the conceptual networking layer that defines logical addressing and routing.
the network layer, defines protocols for routing data by opening and maintaining a path on the network between systems to ensure that data arrives at the correct destination node.
The term used to describe the network layer of the Open Systems Interconnection (OSI) reference model, where protocols such as Internet Protocol (IP) operate. See OSI and IP.
Network Layer Switching and routing layer
Layer 3 refers to the network layer of the commonly referenced multilayered communication model, Open Systems Interconnection (OSI). The network layer is concerned with knowing the address of the neighboring nodes in the network, selecting routes and quality of service, and recognizing and forwarding to the transport layer incoming messages for local host domains. A router is a Layer 3 device, although some newer switches also perform Layer 3 functions. The Internet Protocol (IP) address is a Layer 3 address.
Network The Network layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks while maintaining the quality of service requested by the Transport layer. The Network layer performs network routing, flow control, segmentation/desegmentation, and error control functions. The router operates at this layer -- sending data throughout the extended network and making the Internet possible, although there are layer 3 (or IP) switches. This is a logical addressing scheme - values are chosen by the network engineer. The addressing scheme is hierarchical IP ICMP IPsec ARP RIP OSPF BGP
Switching Layer 3 switching technology integrates routing with switching to yield very high routing throughput rates in the millions-of-packets-per-second range. The movement to Layer 3 switching is designed to address the downsides of the current generation of layer 2 switches, which are functionally equivalent to bridges. These downsides for a large, flat network include being subject to broadcast storms, spanning tree loops, and address limitations that drove the injection of routers into bridged networks in the late 1980s.
The third, or routing, layer of the open systems interconnection (OSI) model. The network layer routes data to different LANs and WANs based on network addresses.
Network layer of the OSI reference model defined in ITU X.200. It is responsible for the network routing and delivery of messages. Examples of Layer 3 protocols include the X.25 packet level protocol and the Internet Protocol. Q.931 is not considered a Layer 3 protocol because it does not route or deliver messages.
Network layer where switching and routing occurs.
In the (OSI) model, the network layer is concerned with the routing and switching of data from its source to its destination.