Recap: Internets Most firms have multiple LANs and WANs They must create internets An internet is a collection of networks connected by routers so that any application on any host on any single network can communicate with any application on any other host on any other network in the internet Application Application LAN WAN LAN Router Router 55 LAN WAN LAN Recap: Internets • Most firms have multiple LANs and WANs. • They must create internets – An internet is a collection of networks connected by routers so that any application on any host on any single network can communicate with any application on any other host on any other network in the internet. Application Application Router Router