GATE (Graduate Aptitude Test in Engineering) Computer Science & IT (CS) Computer Networks-LAN Technologies (Ethernet, Token Ring) Study Material (Page 7 of 12)

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Wireless Local Area Network

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Introduction

  • Wireless Local Area Networks (WLAN) is a term used to define network of spatially and temporally dispersed elements which transmit and receive on air using different bands of Electromagnetic spectrum like Infrared, visible, radio and microwaves. According to CISCO, “A Wireless Local Area Network (WLAN) implements a flexible data communication system frequently augmenting rather than replacing a wired LAN within a building or campus.”
  • Every technology needs standardization. IEEE 802.11 standard was published in 1997 for the provision of network access and resources to different network elements on move. Since its inception, the standard is under continuous updati…

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Modes of Operation of WLAN

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Wireless LANs work in two modes. They are:

  • Infrastructure mode: Devices communicate with each other via access point which is a wireless router
  • Adhoc mode: No infrastructure or access point. Devices cluster communicate with each other.

Infrastructure LAN

It is a cellular architecture. System is divided into cells or clusters. Each cell is called Basic service set (BSS) . Each BSS is controlled by one base station called access point. Cell consists of Stations and access points.…

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