• 21.3 WLAN Topologies 717
  • Figure 21.3 Peer-to-peer topology (Ad hoc Network). AP 1 AP 2 ST 1 ST 4 AP 4 Figure 21.4 Access point-based topology.
  • 21.4 WLAN Technologies
    		•

    Wireless Local Area Networks




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    21.3 WLAN 
    Topologies
    WLANs can be built with either of the following topologies:
    Peer-to-peer (ad hoc) topology
    Access point-based topology
    Point-to-multipoint bridge topology
    In peer-to-peer topology, client devices within a cell communicate directly to 
    each other as shown in Figure 21.3.
    AP-based technology uses access points to bridge traffi c onto a wired (Ethernet 
    or Token Ring) or a wireless backbone as shown in Figure 21.4. AP enables a 
    wireless client device to communicate with any other wired or wireless device on 
    the network. AP-based topology is more commonly used and demonstrates that 
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    21.3 WLAN 
    Topologies 
    717
    Ch21-P373580.indd 717
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    718 
    21 Wireless Local Area Networks
    the WLAN does not replace the wired LAN, it extends connectivity to mobile 
    devices.
    Another wireless network topology is the point-to-multipoint bridge. Wire-
    less bridges connect LANs in one building to LANs in another building even if the 
    buildings are miles apart. These conditions receive a clear line-of-sight between 
    buildings. The line-of-sight range varies based on the type of wireless bridge and 
    antenna used as well as environmental conditions.
    Distribution
    System (DS)
    Access Points (AP)
    Infrastructure Network
    BSS 2
    Ad hoc Network
    Figure 21.3 Peer-to-peer topology (Ad hoc Network).
    AP #1
    AP #2
    ST #1
    ST #4
    AP #4
    Figure 21.4 Access point-based topology.
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    21.4 WLAN 
    Technologies
    The technologies available for use in a WLAN include infrared, UHF (narrowband), 
    and spread spectrum implementation. Each implementation comes with its own set 
    of advantages and limitations.

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