Netgear RP114 Datasheet download pdf (Page 135)

Network and Routing Basics B-1

Appendix B

Network and Routing Basics

This chapter provides an overview of IP networks and routing.

Basic Router Concepts

Large amounts of bandwidth can be provided easily and relatively inexpensively in a local area

network (LAN). However, providing high bandwidth between a local network and the Internet can

be very expensive. Because of this expense, Internet access is usually provided by a slower-speed

wide-area network (WAN) link such as a cable or DSL modem. In order to make the best use of the

slower WAN link, a mechanism must be in place for selecting and transmitting only the data traffic

meant for the Internet. The function of selecting and forwarding this data is performed by a router.

What is a Router?

A router is a device that forwards traffic between networks based on network layer information in

the data and on routing tables maintained by the router. In these routing tables, a router builds up a

logical picture of the overall network by gathering and exchanging information with other routers

in the network. Using this information, the router chooses the best path for forwarding network

traffic.

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Netgear RP114 Datasheet Page 135