Bridges switches routers became cheap enough to

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Unformatted text preview: Conceptual View of LANs For simplicity, hubs, bridges, and wires are oZen shown as a collec8on of hosts a[ached to a single wire: host host ... host Carnegie Mellon Next Level: internets Mul8ple incompa8ble LANs can be physically connected by specialized computers called routers The connected networks are called an internet host LAN host ... host host host ... host LAN router WAN router WAN router LAN 1 and LAN 2 might be completely different, totally incompaHble (e.g., Ethernet and Wifi, 802.11*, T1-links, DSL, ...) Carnegie Mellon Logical Structure of an internet host router router router router host router router Ad hoc interconnec8on of networks No par2cular topology Vastly different router & link capaci2es Send packets from source to des8na8on by hopping through networks Router forms bridge from one network to another Different packets may take different routes Carnegie Mellon The No8on of an internet Protocol How is it possible to send bits across incompa8ble LANs and WANs? Solu8on: pro...
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