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Backbone: National ISP

Local/Regional ISP

Local/Regional

ISP

Internet Physical Infrastructure

Residential Access

Modem

DSL

Cable modem

Access to ISP, Backbone transmission

T1/T3, OC-3, OC-12

ATM, SONET, WDM

Internet Service Providers

Local/Regional/National

They exchange packets at Point of Presence (POP)

Campus network access

Ethernet

FDDI

Wireless

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