For the security of wireless network connections some security standard are defined . Wireless network network devices and communications are based these security standard.

First security standard defined on three layers which is “802.11”. the three layers are:

1. Infrared
2. Direct Sequence Spread Spectrum (DSSS)
3. Frequency Hopping Spread Spectrum (FHSS)

After the “802.11” some other standard were defined by modifying this standard which are:

1. 802.11a
2. 802.11b – Wifi :

This is one of the most used and adapted form or wireless communication networks.

1. 802.11g
2. 802.11i
3. 802.11n
4. 802.16 – WiMax

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