Chapter 6. Hierarchy
We have examined a number of different strategies for network interconnection and concluded that the internet gateway strategy with a common end-to-end network protocol architecture is what is required for use with a distributed system. Successful internets have been built around a datagram interface and service using this approach. An internet must deal with the same issues that a single network must handle, addressing, routing, segmentation, error control, flow and congestion control, as well as accounting and billing. There is not yet much experience with internetworking, and so how best to deal with these issues is not well understood. It appears that routing may be more complicated because of the interactions among networks with different performance, interfaces and services (datagram or VC), tariff structures, and access controls. A useful list of research questions associated with internetworking is contained in [Cerf 78b]. In addition to the problems described there, one should add the problem of handling multiple levels of security control and protection when networks with different security policies are interconnected.
KeywordsCongestion Control Network Interface Circuit Switching Telephone Network Congestion Avoidance
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