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Defining Network Performance19Each of these items can be a potential network performance

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Bình luận RED với In / Out thu-điều khiểnKiểm soát tắc nghẽn lớp nhận theo định hướng phân lớp Multicast Quản lý tài nguyên (tế bào) Multicast Giao thông vận tải đáng tin cậy Điều quan trọng là hãy nhớ rằng, kể từ khi UDP không đảm bảo việc phân phối gói tin, số liệu thống kê dữ liệu cho các gói tin nhận được có thể không đúng. | Defining Network Performance 19 Each of these items can be a potential network performance problem and should be watched in the network monitor. Generating Test Traffic Many network performance tools generate their own network traffic to determine the current performance of the network. This technique requires math skills as well as a knowledge of network theory. All network performance tools that analyze network performance by generating test traffic require two devices on the network. The network performance along the path between the two devices is determined by using the packet pair and packet train methods described previously in the Bandwidth Capacity section. This is demonstrated in Figure 1.4. In Figure 1.4 the network performance tool determines the performance only between devices A and B. No other paths in the network are tested. In order to test other paths on the network the testing devices must be relocated to other points in the network. Of course the alternative is to have multiple test device pairs and locate them at different points in the network. The trick is to place the smallest number of testing points that can cover the largest area on the network. As mentioned calculating network performance requires you to send pairs and trains of packets across the network. The packet pairs do not take up much network bandwidth but the packet trains can place a fair amount of data on the network. Care should be taken when using network performance tools that use packet trains so as not to adversely affect production traffic on the network. Figure 1.4 Generating test traffic on a network path. 20 Chapter 1 Summary This chapter describes what network performance is and how a network performance tool can measure it. Network performance incorporates five separate elements availability response time network utilization network throughput and bandwidth capacity. The availability of the network is crucial for network applications. Testing the availability of the