- The definition of a router is a service or person to transfer messages, or a device for smoothing the bottoms of grooves in wood or metal, or a computer networking device that allows multiple devices to access the Internet simultaneously through a single IP address..
- An example of a router is a mail carrier.
- An example of a router is a woodworking tool.
- An example of a router is computer hardware that transfers Internet messages to a laptop in another room; a wireless router.
router definition by Webster's New World
- a plane for gouging out recesses and smoothing the bottoms of groovesin full router plane
- a machine for routing out areas on a wood or metal surface
router definition by American Heritage Dictionary
- One that routes, especially one who prepares shipments for distribution and delivery.
- Computer Science a. A device in a network that handles message transfers between computers.b. See gateway.
router - Computer Definition
An intelligent switch capable of deciding where to forward packets based on a view of the network as a whole. A router is a programmable device that works with other routers, via a routing protocol, to establish the best path on which to forward a packet with a given address. A router can consider the network as a whole in determining the route for a given call. A router can be programmed to consider a number of factors including the addresses of the originating and destination devices, the least-cost route, the least congested route, the route with the fewest number of hops, and the geographically shortest route. Routers operate at least at Layer 3, the Network Layer, of the OSI Reference Model. Simple switches operate at Layer 2, the Data Link Layer, seeing only an individual link, and having no sense of the larger network. Depending on the applications, routers can operate at higher layers, as well, including Layer 7, the Application Layer. Routers can be capable of performing the gateway functions associated with protocol conversions such as code conversions or those necessary to connect dissimilar networks, such as circuitswitched and packet-switched networks. See also Data Link Layer, gateway, hop, Network Layer, OSI Reference Model, packet, protocol, and switch.
A network device that forwards packets from one network to another. Based on the destination network address in the incoming packet and an internal routing table, the router determines which port (line) to send the packet out (ports typically connect to Ethernet cables). Routers require packets to be formatted in a routable protocol, and the global standard routable protocol today is TCP/IP, or simply "IP." In the home or small office, a wireless router is commonly used to direct traffic to and from the Internet. It combines a router, network switch and Wi-Fi in one box (see wireless router). However, in a large company, routers are also used to separate local networks (LANs) into subnetworks (subnets) to balance traffic within workgroups and to filter traffic for security purposes and policy management. Large-scale enterprise routers take traffic load, congestion, line costs and other factors into consideration to determine which port to forward to. Routers in the Core Within the large enterprise, routers serve as an internet (lower case "i") backbone that connects all internal networks, in which case they are typically connected via Ethernet twisted pair metal wires. Within the global Internet (upper case "I"), routers do all the packet switching between the backbones and are typically connected via SONET fiber links. See Ethernet, SONET and collapsed backbone. Routers and Switches In a local area network (LAN), routers work in conjunction with Ethernet switches. The router forwards packets from network to network, and the switch forwards packets from machine to machine. Routers work at the network layer (layer 3) of the protocol, whereas switches work at the data link layer (layer 2), also known as the "MAC layer." See TCP/IP and data link protocol. Specialized Machines or Regular PCs Most routers are specialized computer-based devices optimized for communications; however, router functions can also be implemented by adding software to a server. For example, NAT32 is Windows software that lets a PC function as a router to the Internet. The major router vendors of equipment for enterprises and service providers are Cisco, Alcatel-Lucent, Huawei, Juniper and ZTE. Router Terminology Routers used to be called "gateways," which is why the term "default gateway" means the router in your network (see default gateway). For more details on the routable protocol layer (network layer 3), see OSI model and TCP/IP abc's. See layer 3 switch, route server, router cluster and routing protocol.
router - Science Definition