Introduction
I've been asked by my little partner latelyWide area networkI don't knowLanDistinction and linksWlanAndWifiThe relationship is then written to provide answers。
2. Wide area networks and local area networks
Wide area network, known as wan, is a collection of a wide-ranging computer network, usually covering tens of kilometres to thousands of kilometres, connecting multiple regions, cities and countries. Because of its extremely long coverage, the medium is mainly a telephone line or fibre-optic that is deployed by the government or large enterprises, and is therefore well known as the extranet, the public network。
Local area network (local area network), known as lan, in relation to the wide area network (wan), refers primarily to computer internet in a given region. “a particular area” refers to the same office, the same building, the same company and the same school, and is generally within a few thousand metres。
More generally, you use mobile internet on your mobile phone to browse the web site by using the wan, a wide-area network provided by the operator. The cell phone, which is used by the local area network (lan), is then accessed by the routers r1, r2 in the map. Yes, routers often serve as “intermediaries” for wan and lan access。
Classifications in local area networks
Lans are divided into cable lans and wireless lans, depending on the use of which conductor or transmission cable。
Wireless lan (english: wireless lan, abbreviated wlan) does not use a local area network connected by any conductor or transmission cable. It uses radio waves or electric and magnetic fields as medium for data transmission, which are typically only tens of metres away。
Cable lan, a local area network connected with a conduit or a transmission cable, can be transmitted as far as thousands of metres。
4. Technology in wireless local area network (wlan)
The greatest difference between wlan and cable lan is "wireless". Wireless lan wlan is actually wide-ranging and, by definition, wlan is known as the network that replaces some or all of the transmission media in the wireless lan with a wireless channel of various radio waves (e. G. Laser, infrared, etc.). However, some technologies, such as wifi, bluetooth, are so much used that they represent almost wlan. In fact, wlan refers to a network structure, and wifi is just one of the technical standards in wlan。
Wifi is an abbreviation of wireless safety and is one of the communication standards in wlan. Because of its relatively simple technology, reliable communications, high flexibility and relatively low cost, the standard has become the mainstream technical standard of wlan, making it misleading for beginners to believe that wlan is the same concept as wifi, no., which encompasses the relationship of the latter。
Now, almost every day, we feel wlan's efficiency and ease in our lives. At home, through wireless means, we can watch the news, draw videos, even on the bed, *** and enjoy the freedom to free ourselves from the cable。
5. Summary
This description gives us the following summary:
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