PCH 15 Introduction to Wireless Networking 無線網絡簡介 <<
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Wireless LANs 無線局域網
Overview 總覽
The popularity of wireless local area networks (WLAN) has increased exponentially because WLAN enables people to remain connected to the network and the Internet without being tethered by wires. In this unit, we are going to cover the concepts, components, standards, design considerations, and security of WLANs. IEEE 802.11 is the overarching standard for wireless LAN technology, and was developed and is maintained by the Institute of Electrical and Electronics Engineers (IEEE) to provide wireless Ethernet connectivity to a wired IEEE 802.3 network.
無線局域網（WLAN）的普及已成倍增加，因為WLAN使人們能夠保持連接到網絡和Internet，而不必受到電線的束縛。 在本單元中，我們將介紹WLAN的概念，組件，標準，設計注意事項和安全性。 IEEE 802.11是無線LAN技術的總體標準，由電氣和電子工程師協會（IEEE）開發和維護，以提供與有線IEEE 802.3網絡的無線以太網連接。
WLAN Concepts WLAN 概念
Wireless local area networks are broken down into two generalized categories: ad-hoc WLANs and infrastructure WLANs. In ad hoc wireless networks, the wireless devices communicate directly with each other without the need for a wireless access point. This mode is similar to a peer-to-peer network topology, where each device connects to each other device in a mesh configuration using radio frequency waves directly between each wireless device’s interface card. This is the wireless equivalent of connecting two workstations together using a crossover cable, thereby eliminating the need for network infrastructure like hubs and switches.
The second category, infrastructure WLANs, is the version that is most often and widely utilized. When operating in infrastructure mode, the wireless devices communicate to a centralized wireless router or wireless access point, and then use that centralized device to initiate communication with other wireless or wired devices that are also attached to the centralized device. This is the wireless equivalent of connecting multiple workstations to a common hub or switch and utilizing that network device to create communication between the workstations.
無線局域網分為兩大類：即席WLAN和基礎設施WLAN。在自組織無線網絡中，無線設備之間直接相互通信，而無需無線接入點。此模式類似於點對點網絡拓撲，在這種拓撲中，每個設備都在網狀配置中使用射頻波直接在每個無線設備的接口卡之間連接到彼此。這相當於使用交叉電纜將兩個工作站連接在一起的無線方式，從而消除了對集線器和交換機等網絡基礎設施的需求。
第二類是基礎設施WLAN，是最常用和廣泛使用的版本。當在基礎結構模式下運行時，無線設備與集中式無線路由器或無線接入點進行通信，然後使用該集中式設備來啟動與也連接到該集中式設備的其他無線或有線設備的通信。這相當於將多個工作站連接到公共集線器或交換機，並利用該網絡設備在工作站之間創建通信。
PCH 15 Introduction to Wireless Networking 無線網絡簡介 <<
Previous Next >> Wireless Devices 無線設備