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End systems running network applications.
Host
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Fiber, copper, radio, and satellite.
Communication links
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Forward packets (chunks of data). Egs: routers and switches.
Packet switches
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A network of billions of connected computing devices.
Internet
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End hosts such as clients and servers
Network edge
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Wired, wireless communication links connecting end hosts.
Access networks:
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Interconnected routers, network of networks.
Network core
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Voice and data transmitted at different frequencies over dedicated phone line to central office.
Digital Subscriber Line (DSL)
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At the central office multiplex data from Internet, and voice from telephone network.
DSL Access Multiplexer (DSLAM)
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Network of cable, fiber attaches homes to ISP router.
Cable Network
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