tailieunhanh - cwts certified wireless technology specialist official study guide exam pw0 070 phần 4

chức năng mạng LAN không dây công nghệ ở lớp 1 và lớp 2 của mô hình OSI. D. Trong thuật ngữ máy tính, song công một nửa là thông tin liên lạc hai chiều nhưng chỉ có một cách tại một thời điểm. Song công toàn là thông tin liên lạc hai chiều trong cả hai hướng cùng một lúc. | Coverage and Capacity 107 wireless computer. This is an example of wide coverage. The applications in use on the wireless network will have an impact on the overall performance. If all 100 people are using a CAD CAM application which is bandwidth intensive the overall performance will be poor because this type of application requires a lot of resources. Therefore more access points each covering less space would parlay into better overall performance for the users. Wide coverage in a densely populated area may allow too many users to connect to a single access point resulting in poor performance overall as explained with the CAD CAM application example. As mentioned earlier wireless LANs use what is known as a shared medium. In other words all users connected to an access point will share the available bandwidth. Too many users using powerful applications will overload the access point adding to the poor performance issues. This scenario can also be considered a capacity issue. In this situation more access points with each AP covering a smaller area would be a better solution. Applications in Use The application types in use either software or hardware can affect the bandwidth of an access point. If the users connected to an access point use bandwidth-intensive applications such as the CAD CAM application mentioned earlier this could result in poor throughput for all users connected to that access point. This is another example where more access points with each covering a smaller area could be a better solution than a single access point covering a large area. Multiple access points could allow the high-bandwidth users to be separated from other parts of the network increasing overall performance of the network. Obstacles Propagation and Radio Frequency Range Obstacles in an area such as walls doors windows and furnishings as well as the physical properties of these obstacles thickness of the walls and doors density of the windows and type of furnishings can also