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所在平台: Udemy |
课程主页: https://www.udemy.com/course/wireless-network-fundamentals-w/
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课程名称：无线网络基础（Wireless Network Fundamentals） 讲师：Arash Deljoo 课程概述： 无线局域网（WLAN）是一种无线计算机网络，使用无线通信将两个或更多设备连接起来，在家庭、学校、计算机实验室、校园或办公楼等有限区域内形成局域网（LAN）。这种网络让用户可以在该区域内自由移动，同时保持网络连接。通过网关，WLAN还可以提供连接更广泛互联网的功能。基于IEEE 802.11标准的无线局域网是全球使用最广泛的计算机网络，通常称为Wi-Fi（Wi-Fi是Wi-Fi联盟的商标）。Wi-Fi常用于家庭和小型办公室网络，将笔记本电脑、打印机、智能手机、网络电视和游戏设备通过无线路由器连接，路由器将这些设备链接到互联网。在餐馆、咖啡店、酒店、图书馆和机场等地提供的热点使消费者能够用便携式无线设备访问互联网。 IEEE 802.11有两种基本的操作模式：基础设施模式和临时网络模式。在临时网络模式中，移动单位通过点对点的方式直接通信；而在基础设施模式下，移动单位通过无线接入点（WAP）进行通信，WAP同时作为其他网络（如局域网或互联网）的桥梁。由于无线通信相较于有线局域网使用了更开放的传输媒介，802.11的设计者们还加入了加密机制，如：有线等效隐私（WEP，现已不再被认为安全）、Wi-Fi保护接入（WPA、WPA2、WPA3），以保护无线计算机网络的安全。许多接入点还提供Wi-Fi保护设置，这是一个快速的连接新设备到加密网络的方法，但该方法也不再被认为安全。 总之，本课程旨在帮助学习者了解无线网络的基本概念和技术，掌握Wi-Fi网络的工作原理及其安全性。
A wireless LAN (WLAN) is a wireless computer network that links two or more devices using wireless communication to form a local area network (LAN) within a limited area such as a home, school, computer laboratory, campus, or office building. This gives users the ability to move around within the area and remain connected to the network. Through a gateway, a WLAN can also provide a connection to the wider Internet.Wireless LANs based on the IEEE 802.11 standards are the most widely used computer networks in the world. These are commonly called Wi-Fi, which is a trademark belonging to the Wi-Fi Alliance. They are used for home and small office networks that link together laptop computers, printers, smartphones, Web TVs and gaming devices with a wireless router, which links them to the internet. Hotspots provided by routers at restaurants, coffee shops, hotels, libraries, and airports allow consumers to access the internet with portable wireless devices.The IEEE 802.11 has two basic modes of operation: infrastructure and ad hoc mode. In ad hoc mode, mobile units communicate directly peer-to-peer. In infrastructure mode, mobile units communicate through a wireless access point (WAP) that also serves as a bridge to other networks such as a local area network or the Internet.Since wireless communication uses a more open medium for communication in comparison to wired LANs, the 802.11 designers also included encryption mechanisms: Wired Equivalent Privacy (WEP), no longer considered secure, Wi-Fi Protected Access (WPA, WPA2, WPA3), to secure wireless computer networks. Many access points will also offer Wi-Fi Protected Setup, a quick, but no longer considered secure, method of joining a new device to an encrypted network.
