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Wireless Networks dor Dummies phần 8

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Bây giờ bạn cần để cho phép các hình thức xác thực dựa trênĐược rồi, do đó, Barry phát hiện ra một loạt các mạng lưới. Big đối phó. Vâng, nó có thể là một vấn đề lớn nếu họ không được bảo đảm. Điều đó có nghĩa là ai đó có thể sử dụng mạng của bạn. | 266 Part IV Keeping Your Network on the Air Administration Troubleshooting Estimating network performance A lot of things can negatively impact network performance from poor device drivers to competing traffic to inconsiderate users downloading gigabytes worth of MP3s on your network. All this makes for poor relations between the users and your technical staff. You need a method of determining that traffic and balancing sufficient load with your business needs. To estimate the performance of your network you need to understand the traffic that it will sustain. Are your users able to connect to the Internet and download MP3- or AVI-type files Are network people using the wireless spectrum to download large patches and configuration files How many users are on the network at a given time and what are their main job functions The performance of your wireless network depends on factors such as distance to an access point structural interference of buildings and walls and placement and orientation of devices especially antennae. You really need expert advice to do this well. Sites such as www.csm.ornl.gov dunigan netperf netlinks.html can provide you with tons of detailed information on performance issues and calculations. Another interesting site is the Cooperative Association for Internet Data Analysis www.caida.org which offers specialized advice on Internet network traffic analysis. You might use this to determine the speed of your Internet connections. You can use a rough formula though to calculate an estimate of traffic load on your network. Appendix C contains a table that provides frequencies and their data rates. Using 802.11b as an example you see that data transfer can occur at up to 11 Mbps. Of course the likelihood of you achieving anywhere near that speed is remote so taking a conservative estimate of 5 Mbps you can begin to calculate traffic load. Next you need to know what you might be using over the network such as e-mail or file transfer. If you are .