Why do we need wireless LAN? Explain the architecture of IEEE 802.11 in detail.


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We need wireless LAN because of the following reasons

  • It’s a reliable sort of communication.
  • As WLAN reduces physical wires so it’s a versatile way of communication.
  • WLAN also reduces the value of ownership.
  • It’s easier to feature or remove workstation.
  • It provides high rate thanks to small area coverage.
  • You’ll also move workstation while maintaining the connectivity.
  • For propagation, the sunshine of sight isn’t required.
  • The direction of connectivity are often anywhere i.e. you’ll connect devices in any direction unless it’s within the range of access point.
  • Easy installation and you would like don’t need extra cables for installation.
  • WLAN are often useful in disasters situation e.g. earthquake and fire. WIreless network can connect people in any disaster
  • It’s economical due to the tiny area access.
  • The  amount of power it requires is more as it uses transmitter; therefore, the battery life of laptops can be affected

IEEE 802.11 Architecture:

The components of an IEEE 802.11 architecture are as follows −

  • Stations (STA) − Stations comprises of all devices and equipment that are connected to the wireless LAN. A station can be of two types−
    • Wireless Access Point (WAP) − WAPs or simply access points (AP) are generally wireless routers that form the base stations or access.
    • Client. Clients are workstations, computers, laptops, printers, smartphones, etc.
  • Each station has a wireless network interface controller.
  • Basic Service Set (BSS) − A basic service set is a group of stations communicating at the physical layer level. BSS can be of two categories depending upon the mode of operation−
    • Infrastructure BSS − Here, the devices communicate with other devices through access points.
    • Independent BSS − Here, the devices communicate in a peer-to-peer basis in an ad hoc manner.
  • Extended Service Set (ESS) − It is a set of all connected BSS.
  • Distribution System (DS) − It connects access points in ESS.

IEEE 802.11 Architecture

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