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Challenge 6: Multi-Domain Another challenge in multi-domain operation: security At domain boundaries, increasing number of application layer gateways (e. g., proxies) => split up end-to-end connections and prevent end-to-end congestion control Many AS exchange some limited amount of information about their internal state (topology hiding principle) >< having more precise information highly beneficial for congestion control => future evolution of the Internet inter-domain operation has to show whether more multi-domain information exchange can be realized. |