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Routers connect two or more logical subnets, which do not necessarily map
one-to-one to the physical interfaces of the router.. The term layer 3 switch
often is used interchangeably with router, but switch is really a marketing term
without a rigorous technical definition. In marketing usage, it is generally
optimized for Ethernet LAN interfaces and may not have other physical interface
types.
Routers operate in two different planes
Control Plane, in which the router learns the outgoing interface that is most
appropriate for forwarding specific packets to specific destinations,
Forwarding Plane, which is responsible for the actual process of sending a
packet received on a logical interface to an outbound logical interface.
Carrier Routing System
Routers for Internet connectivity and internal use
Provider Edge Router:
Small Office Home Office (SOHO) connectivity
Residential gateways (often called routers) are frequently used in homes to
connect to a broadband service, such as IP over cable or DSL. A home router may
allow connectivity to an enterprise via a secure Virtual Private Network.
Enterprise Routers to be found in ISPs, academic and research
facilities, as well as large businesses,
Access routers, including SOHO, are located at customer sites
Distribution routers aggregate traffic from multiple access routers, either at
the same site, or to collect the data streams from multiple sites to a major
enterprise location.
In enterprises, core router may provide a "collapsed backbone" interconnecting
the distribution tier routers from multiple buildings of a campus, or large
enterprise locations.
2Wire , 3Com , AirLink , AirLink Communications, Apple , Ativa
,
Belkin , Billionton , Blitzz Technology , Bountiful WiFi , Buffalo ,
Cables4PC ,
Cisco , CNet , CP Technology , Cradlepoint, CradlePoint
Technology ,
D-Link, Dell , Dynex , EnGenius, Global Marketing Partners ,
Hawking Technology,
HotBrick, Kyocera, Linkskey , Linksys , Linksys Network Everywhere,
Microsoft ,
Motorola , Multi-Tech Systems , Navman , Nearson , Netgear ,
Netopia ,
NexxTech , Paradyne, Siemens, SMC, Terk , Top Global,
Toshiba ,
TP-Link , TRENDnet , Trendware , Unknown, USRobotics ,
WiFi World, Zoom,
ZyXel.
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