Communication Models Conversation Point-to-point, emphasize the e2e paths or channels Packets carrying addresses simply flow in the channel IP adopts the same communication model as the telephone service, just the solution is different Content retrieval Request content from network services Emphasize on the content of the packet, not the location of the content or the channel Both can probably support all possible services, given enough efforts. The question is which one fits application needs better 1212 Communication Models  Conversation  Point-to-point, emphasize the e2e paths or channels.  Packets carrying addresses simply flow in the channel.  IP adopts the same communication model as the telephone service, just the solution is different.  Content Retrieval  Request content from network services.  Emphasize on the content of the packet, not the location of the content or the channel.  Both can probably support all possible services, given enough efforts. The question is which one fits application needs better