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What are the important topics in WIFI :

It would be very helpful if some one answered this

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WiFi :
1.Basic concepts
2.Why CSMA/CD is not used in WiFi.
3.Architecture
4.AdHoc : IBSS
5.Distributed Systems
6.IFS(Inter frame space)
7.Collision avoidance
8.Poll cycle
9.Hidden node
10.Physical and Virtual Carrier sense
11.Exposed terminal
12.WiFi (802.11) Frame format
13.Frame control (from frame format) .

Best source is standard books like Frouzan.

Also one can see for brief intro

http://www.cs.miami.edu/home/burt/learning/Csc524.052/notes/wifi.html

https://www.geeksforgeeks.org/basics-of-wi-fi/

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