Why the Hourglass Architecture?

• Why an internet layer?

  • make a bigger network
  • global addressing
  • virtualize network to isolate end-to-endprotocols from network details/changes

• Why a single internet protocol?

  • maximize interoperability
  • minimize number of service interfaces

• Why a narrow internet protocol?

  • assumes least common network functionalityto maximize number of usable networks

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