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Advantages and Disadvantages of ESS

ESS (Extended Service Set), as the name suggests, is a service set that usually contains two or more BSS (Basic Service Set) that are interconnected with each other. These BSSs share common network name i.e. SSID. SSID stands for System Service Identifier. It is a unique mac address given to each AP (Access Point) associated with BSS. BSS usually provide short range wireless communication but ESS provides long range wireless communication. To create long range wireless communication, more than one APs is required and then all of them are connected to a wired network. ALL APs in ESS are connected to each other by a common DS (Distribution System). With the help of DS, more than one AP can get connected to the same LAN. All APs work together to create a long range wireless network that usually covers the whole building, large area. Although there are more than one APs present within system and each AP has a unique BSSID, all users or clients present within area sees only one common network name i.e. SSID. Therefore, this network is known as Extended system service. 
 
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