tailieunhanh - Lecture Wireless LANs: Implementing a WLAN

The main contents of this chapter include all of the following: topologies operate; BSS wireless topology consists of the basic service area (BSA) and the extended service area (ESA); wireless access points can be configured through a CLI or, more commonly, a browser GUI; the basic approach to wireless implementation is to gradually configure and test incrementally;. | Wireless LANs Implementing a WLAN Topology Building Blocks Ad hoc mode: Independent Basic Service Set (IBSS) Mobile clients connect directly without an intermediate access point. Infrastructure mode: Basic Service Set (BSS) Mobile clients use a single access point for connecting to each other or to wired network resources. Extended Service Set (ESS): Two or more BSSs are connected by a common distribution system . Following is a summary of the different WLAN topologies: Ad hoc mode: This mode is called Independent Basic Service Set (IBSS). Mobile clients connect directly without an intermediate access point. Operating systems such as Windows have made this peer-to-peer network easy to set up. This setup can be used for a small office (or home office) to allow a laptop to be connected to the main PC or for several people to simply share files. The coverage is limited. Everyone must be able to hear everyone else. An access point is not required. A problem is that peer-to-peer networks are difficult to secure. Infrastructure mode: In infrastructure mode, where clients connect through an access point, there are two modes: - Basic Service Set (BSS): The communication devices that create a BSS are mobile clients using a single access point for connectivity to each other or to wired network resources. This should not be confused with the Basic Service Set Identifier (BSSID) which is only the layer 2 MAC address of the BSS access point’s radio card. While the BSS is the single building block for wireless topology and the BSS access point is uniquely identified through a BSSID, the wireless network itself is advertised through a Service Set Identifier (SSID). The SSID is a wireless network name that is user configurable. The SSID can be made up of as many as 32 case sensitive characters to announce the availability of the wireless network to mobile clients. - Extended Services Set (ESS): The wireless topology is extended with two or more Basic Service Sets connected

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