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 a general 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. In comparison a network hub does not do any routing, instead every packet it receives on one network line gets forwarded to the other network lines.

Cisco is the world largest supplier of network routers as well as the most known.

CISCO PIX 515 UR 2FE INTERFACE 256D Memory    US $369.00

Adtran Atlas 550 3x 8 FXS 1x Nx 56 64 1x T1 1200305L1    US $195.00

CISCO 2610XM 64M 32F    US $16.50

Cisco 2811 Integrated Services Router Advanced K9 IOS    US $985.00

NEW Linksys Cisco SPA2102 VoIP Phone Adapter Router    US $52.95

Cisco NMD 36 ESW with 2GE    US $523.88

Cisco WS X4148 RJ45V for Catalyst 4000 or 4500    US $136.67

New LINKSYS VPN ROUTER W 4 PORT SWITCH Retail RV042    US $164.99

Cisco CSS 11155 256M AC Content Services Switch    US $359.88

Cisco 1750 Modular Access Router Used Good Condition    US $44.95

Cisco CCNA CCNP 3 Router 3 Switch Lab Kit 12321    US $514.99

Cisco 3600 3620 Router 64D 16F Serial 2 Ethernet Ports    US $159.99

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