router

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Related to Ethernet router: Ethernet switch, Ethernet hub

router

1
any of various tools or machines for hollowing out, cutting grooves, etc.

router

2
Computing a device that allows packets of data to be moved efficiently between two points on a network
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

router

[′rau̇d·ər]
(communications)
A device that selects an appropriate pathway for a message and routes the message accordingly.
(design engineering)
A chisel with a curved point for cleaning out features such as grooves and mortises on wood members.
(mechanical engineering)
A machine tool with a rapidly rotating vertical spindle and cutter for making furrows, mortises, and similar grooves.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

router

2. A machine tool having a rapidly revolving vertical spindle and cutter; used for routing, cutting mortises, etc.
3. A chisel having a curved point; used for cleaning out grooves, mortises, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

router

(networking)
/roo't*/ A device which forwards packets between networks. The forwarding decision is based on network layer information and routing tables, often constructed by routing protocols.

Unix manual page: route(8).

See also bridge, gateway, Exterior Gateway Protocol, Interior Gateway Protocol, flapping router.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

router

A device that forwards data from one network to another. Based on an internal routing table and the address of the destination network in the incoming packet, the router determines whether to send the packet out or keep it within the network. The traffic traversing a router is formatted in a routable protocol, the global standard being TCP/IP, or simply IP (see TCP/IP and routable protocol).

At Home
In the home or small office, a "wireless router" or "wireless gateway" is used to manage Internet traffic. The wireless router contains a built-in Ethernet switch and Wi-Fi access point (see wireless router), and the wireless gateway also includes a modem (see cable/DSL gateway). Both router and gateway have a single port to the Internet.

In a Company
In the enterprise, routers in the local network (LAN) are dedicated to packet forwarding and connect to stand-alone modems and Wi-Fi access points. Although routers do have built-in Ethernet ports, they are often connected to additional Ethernet switches to reach more computers and printers. See Ethernet switch and access point.

Routers in the Core
Within a large enterprise, routers separate local area networks (LANs) into subnetworks (subnets) to balance traffic within workgroups and to filter traffic for security purposes and policy management. They also forward packets between the company's LANs and external networks (WANs), as well as to the Internet. Factors such as traffic load, external line costs and congestion may be taken into consideration to determine which port to forward to. See LAN and WAN.

Within the Internet, very large-scale routers do all the packet switching between the national and regional backbones and are typically connected via optical fibers. Measured in millions of packets per second (see PPS), large routers handle enormous amounts of traffic. See packet switching, Ethernet, SONET, edge router and collapsed backbone.

Specialized Machines or Regular PCs
Routers are dedicated communications devices, and the major router vendors for enterprises and service providers are Cisco, Alcatel-Lucent, Huawei, Juniper and ZTE. Linksys, NETGEAR and D-Link make popular consumer routers. However, a Windows PC can be turned into a router with software such as NAT32 (www.nat32.com).

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, see OSI model and TCP/IP abc's. See layer 3 switch, route server, router cluster and routing protocol.


Route Forwarding
Routing tables hold the data for making forwarding decisions. Although this is a simple example, routing tables become very complex. Static routing uses fixed tables, but dynamic routing uses routing protocols that let routers exchange data with each other.




Route Forwarding
Routing tables hold the data for making forwarding decisions. Although this is a simple example, routing tables become very complex. Static routing uses fixed tables, but dynamic routing uses routing protocols that let routers exchange data with each other.







Cisco Routers
For years, Cisco has been the leading router vendor, and these high-end, carrier-grade 7600 models process up to 30 million packets per second (pps). Cisco also makes faster routers as well as smaller routers for less intensive applications. (Image courtesy of Cisco Systems, Inc.)




Cisco Routers
For years, Cisco has been the leading router vendor, and these high-end, carrier-grade 7600 models process up to 30 million packets per second (pps). Cisco also makes faster routers as well as smaller routers for less intensive applications. (Image courtesy of Cisco Systems, Inc.)
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References in periodicals archive ?
If Bob's computer is on a LAN, the message will enter the LAN through Bob's Ethernet router which is connected to Bob's ISP.
The new Industrial Ethernet Router ensures that different networks interoperate in unison and with top-level security.
D-Link DWR-131 - D-Link DWR-131 is a Portable 3G Ethernet Router that provides users with all the flexibility of mobile broadband access.
D-Link's Wireless N range includes the following products: Gigabit Router DIR-655; Fast Ethernet Router DIR-635; ADSL Router DSL-2740B; USB Adapter DWA-142; USB Mini Adapter DWA-140; PCI Adapter DWA-547; CardBus Adapter DWA-645; bundle kit DKT-140 consisting of the DIR-635 & DWA-140; as well as bundle kit DKT-810 consisting of the DSL-2740B and the DWA-140.
Other Actiontec products for DSL service providers include the Actiontec USB Home DSL Modem, a full-rate ADSL USB modem that allows users to simultaneously talk and surf the Internet on the same phone line; the Actiontec USB/Ethernet Home DSL Modem (bridge only), which gives users the option of connecting either to a USB or an Ethernet port; and the Actiontec Wireless-Ready DSL Gateway, an ADSL modem with a 4-port 10/100 Mbps Ethernet router and a USB LAN port that can be used to connect five PCs in a wired network.
Today a Fast Ethernet routing switch port is around $700 and a Fast Ethernet router port is around $5,000.
The DSL605 range incorporates five products based on ADSL2+ technology, including Ethernet Routers with and without USB connectivity and a four-port Ethernet Router with VoIP and WLAN capabilities.
The NetVanta 3100 Series includes the NetVanta 3120 fixed-port Ethernet router, priced at USD595, with 10/100Base-T Ethernet WAN interface, four-port managed Ethernet switch and analog modem for remote management or dial-backup.
According to the company, the ADSL2+ Ethernet router is particularly suitable for broadband services up to 24Mb.

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