A new generation of networking products has emerged for the specialized task of "Server Load Balancing" or Web Traffic Management. Examples of these devices are known as "Layer 4 switches" and Web switches. While they share some of the attributes of previous generation of LAN switches and routers that are designed to handle stateless or connection-oriented communications, Web switches are optimized to handle stateful, or connection oriented communications between Clients (browsers) and Web servers in an Internet or Intranet environment. Testing this new generation of Web switches requires a new approach that combines the concepts from traditional testing methods for network devices, applications and servers. Care must be taken to select the right tools for the job, and to understand the metrics and test criteria for the test case. But most important is to construct test scenarios that test performance against real world conditions including server load, a realistic mix of file sizes, relevant metrics and meaningful results.
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