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Multiple actors High-level architecture requirement: accommodate competing and non-cooperative parties see also “Tussle in Cyberspace”, by David D. Clark, John Wroclawski, Karen R. Sollins, Robert Braden Division on previous slide just an example but seems probable some functions could be collapsed into one box or omitted in particular deployments Different actors have different skills and interests some may be competing with each other ISPs, VSPs, mapping providers limited mutual trust or limited ability to determine trustworthy parties national politics (“Oceania is not talking to Eurasia”) ? need neutral parties there may not be a political root organization see ICANN difficulties |