History of Heterogeneous Nets

• Early ‘70s emulating specific terminals

• ‘75 - ‘85 JANUS application level gateways

  • Slow, points of failure, pre-located

• ‘85 - ‘95 Rise of the routers

  • Packet forwarding functionality at network level
  • Originally agreed functionality for routers
  • Differences between intra and inter-domain
  • Start of QoS via IntServ

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