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Basic Service Set (BSS)
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The basic service set (BSS) is also known as an infrastructure basic service set Because we have already used the acronym IBSS for an independent basic service set, we simply call the infrastructure service set a BSS The infrastructure BSS is much more common than the IBSS, and therefore it makes sense to grant the base acronym to this mode A BSS does utilize an access point The access point acts as the connection point to the infrastructure or forms the infrastructure itself, which is why it is called an infrastructure BSS In this mode, client devices do not communicate with each other directly Instead they communicate with the access point in a hub-and-spoke fashion as depicted in Figure 3-7 When an access point connects to a physical network infrastructure, such as Ethernet, it forwards frames (information or data) from the wireless clients to the wired devices and back When an access point does not connect to a physical network infrastructure, it forwards frames from one wireless client device to another and back In the first scenario an existing infrastructure is extended, and in the second an infrastructure is created When you connect a physical patch cable to an Ethernet network, you are connected to the network Since cables aren t used in wireless networks, something else is needed In a wireless network, both IBSS and BSS, the concept of association is analogous to plugging in the patch cable Association means the wireless client requests and is then granted permission to join the service set This is important because any given area can have multiple access points and the client must know with which access point to communicate This is determined by the SSID configured on the client and the access point
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Extended Service Set (ESS)
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You might guess that an ESS is another kind of service set, and you are right An extended service set, or ESS, is one or more BSSs that share the same network name or SSID and are connected to the same distribution system The distribution system may be wired or wireless, but it is shared by all access points participating in an ESS The concept of the ESS allows users to roam around (physically) on the network and still connect to the same network with the same name Ignoring possible security hindrances, when a user moves from an area (sometimes called a cell) covered by one access point to an area covered by another, that user should be able to roam Roaming is not perfect, and some vendor s access points will
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not properly pass the user off to other vendor s access points, but it is getting better and should improve with the ratification of 80211r, which was completed in 2008 If you want the best odds of implementing functional roaming capabilities, make sure you buy the same access point for each cell coverage area
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Active scanning uses probe request and probe response frames to find a WLAN to join There are two general methods that can be used by a client station to find the WLAN The first is to specify the SSID of the network being sought and the second is to seek any BSS that may be able to hear and respond to the probe request If the SSID is specified in the probe request frame transmitted by the requesting station (the client wireless computer), all access points that are configured with a matching SSID should respond, assuming they receive the probe request frame It is certainly possible that a set of access points using the same SSID could cover an area large enough that all of the access points will not receive the probe request transmitted from a specific location in that area The response from the access points that hear the probe request is a probe response frame The client uses these probe response frames in order to choose the best access point with which to connect based on data rates and standards supported In an ad hoc wireless network, which is a network without an access point, the station that last transmitted the beacon frame (the beacon frame is a periodic frame transmitted by access points and ad hoc devices in order to update all members of the network on the status of the network) will respond to probe requests There are also times when no station will respond to a probe request This happens when vendors provide a feature to disable probe responses, even though the 80211 standard requires that all access points respond with a probe response when a probe request is received matching the access point s configured SSID or when the probe request contains a wildcard SSID (an SSID of zero length, formerly called the broadcast SSID) The vendors often allow their access points to be configured so that they ignore wildcard SSIDs While this is a nonstandard configuration, as long as the WLAN administrator has configured all valid clients to specify the SSID, it should not cause problems within the WLAN for these clients This ignoring of probe requests is sometimes thought to provide a more secure environment; however, it is important to remember that the beacon frames have the SSID in them by default Unless this SSID broadcasting is turned off, those wishing to penetrate your network can easily discover the SSID with WLAN analysis
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