Internet structure: network of networks

• roughly hierarchical

• national/international backbone providers (NBPs)

  • e.g. BBN/GTE, Sprint, AT&T, IBM, UUNet
  • interconnect (peer) with each other privately, or at public Network Access Point (NAPs)

• regional ISPs

  • connect into NBPs

• local ISP, company

  • connect into regional ISPs

NBP A

NBP B

regional ISP

regional ISP

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