Editing Network topology (section)

===Routers===
[[File:Adsl connections.jpg|thumb|right|A typical home or small office router showing the [[ADSL]] telephone line and [[Ethernet]] network cable connections]]
A [[Router (computing)|router]] is an [[internetworking]] device that forwards [[Packet (information technology)|packets]] between networks by processing the routing information included in the packet or datagram (Internet protocol information from layer 3).  The routing information is often processed in conjunction with the [[routing table]] (or forwarding table).  A router uses its routing table to determine where to forward packets. A destination in a routing table can include a [[Black hole (networking)|black hole]] because data can go into it, however, no further processing is done for said data, i.e. the packets are dropped.