Characterizing Types of Traffic Flow for New Network ApplicationsAs mentioned, a network flow can be characterized by its direction and symmetry.Direction specifies whether data travels in both directions or in just one direction.Direction also specifies the path that a flow takes as it travels from source to destinationthrough an internetwork. Symmetry describes whether the flow tends to have higher performance or QoS requirements in one direction than the other direction. Many network applications have different requirements in each direction. Some data link layer transmission technologies, such as Asymmetric Digital Subscriber Line (ADSL), are fundamentally asymmetric. A good technique for characterizing network traffic flow is to classify applications as supporting one of a few well-known flow types:■ Terminal/host traffic flow■ Client/server traffic flow■ Peer-to-peer traffic flow■ Server/server traffic flow■ Distributed computing traffic flowIn his book Network Analysis, Architecture, and Design, Third Edition, James D. McCabe does an excellent job of characterizing and distinguishing flow models. The descriptions of flow types in the sections that follow are partially based on McCabe’s work.
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