Wi-Formation
In Wi-formation, I show you the basic definition and explanation of abbreviations have been heard a hundred times that. Wireless networks consist of:
1) Distribution System – a combination of engine and bridging backbone network.
2) Access Point – Wireless leads to wired bridge.
3) Wireless Medium – for the exchange of images between the stations and the backbone.
4) Station – PCs, laptops and other devices with wirelessNIC.
The basic block of 802.11 networks is BSS – Basic Service Set. This is a group of stations, which communicate only between them.
There are two types of BSS:
Independent BSS or ad hoc networks. Only stations without Access Point. You can setup your wireless home network, even without AP.
Infrastructure BSS networks – Station Access Point to use for communication between them. Why do we actually need to use Access Point, if it is notessential? There are several reasons for this:
– Wireless Access Point bridges wired word. So without an access point, you have no connection to the rest of the world.
– Greater range. Range of infrastructure BSS is defined by the distance between station and access point. In the ad-hoc network range is defined by distance between the stations.
– With Access Point, save power stations. At the station a power mode switch, buffer access for framesit.
Extended service areas ESS connection with BSS network backbone. ESS connects with the rest of the word channel – the Internet.
From user's prospective, wireless is wireless Ethernet. Network administrators need to know that frame delivery is unreliable, compared to wired networks. For that standard requires 802.11 a number of additional services and complex framing.
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