Netgear DSL Modem Internet Gateway DG814 User Manual download pdf (Page 91)

Networks and Routing Basics B-1

Appendix B

Networks and Routing Basics

This chapter provides an overview of IP networks, routing, and firewalls.

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.

Routers vary in performance and scale, number of routing protocols supported, and types of

physical WAN connection they support. The Model DG814 DSL Modem Internet Gateway is a

residential or small office router that routes the IP protocol over a single-user ADSL connection.

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Netgear DSL Modem Internet Gateway DG814 User Manual Page 91