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Wireless LAN Standards (Media Access Control (MAC) (transmits frames and…
Wireless LAN Standards
Beacon Frame
Beacon frame is one of the management frames in IEEE 802.11 based WLANs. It contains all the information about the network.
Beacon frames are transmitted periodically, they serve to announce the presence of a wireless LAN and to synchronise the members of the service set.
Logical Link Layer (LLC)
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in the data link layer the LLC adds its own headers to the packets and then passes it to the MAC sublayer
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Scanning Techniques
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Active - optional
The Wireless NICs in devices broadcast probe request frames to solicit probe responses from other devices
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OFDM
Divides a 20 MHz RF channel into 48 narrowband sub-channels and then splits a data signal into 48 separate carriers
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FDM
frequency-division multiplexing is a technique by which the total bandwidth available in a communication medium is divided into a series of non-overlapping frequency bands
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