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Administrators of wide-area IP networks-whether for Internet Service Providers or large corporate intranets-will face new and difficult challenges over the next few years. The growth of IP traffic is dwarfing the flat or modest growth rates of legacy (SNA, IPX) traffic. End-users are demanding consistently reliable performance for their network-based applications. Network managers are under pressure to enhance their infrastructures to support special or premium services for customers willing to pay for them. More bandwidth, lower network latencies, and high-speed traffic classification will be required to adequately support increased traffic volumes and new services.