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Network bottlenecks contribute very little however they are important enough to be discussed in detail because you cannot afford minor issues as well because they can lead to disasters. Following are the major network performance symptoms in context of 3-tier web applications,

Application architecture is formed by several components and there could be dozens of bad performance symptoms in each component. Being a good performance tester, one must know the list of performance symptoms on each tier to diagnose bottlenecks effectively.Below is the detailed list of symptoms of each of the web applications 3-tier component.

The configuration, or topology, of a network is key to determining its performance. Network topology is the way a network is arranged, including the physical or logical description of how links and nodes are set up to relate to each other. The term topology was introduced by Johann Benedict Listing in the 19th century.

Network architecture refers to how computers are organized in a system and how tasks are allocated between these computers. Two of the most widely used types of network architecture are peer-to-peer and client/server.