CWNA Chapter 12 – WLAN Troubleshooting and Design

My Notes from chapter 12 of the CWNA study guide Layer 2 retransmissions The mortal enemy of WLAN performance is layer 2 retransmissions that occur at the MAC sublayer If a collision occurs or any portion of a unicast frame is corrupted, the cyclic redundancy check (CRC) will fail and the receiving 802.11 radio will …

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CWNA Chapter 6 – Wireless Networks and Spread Spectrum Technologies

My Notes from chapter 6 of the CWNA study guide  Industrial, Scientific, and Medical bands (ISM) ISM bands are defined by the ITU Telecommunication Standardization Sector (ITU-T) All three of these bands are license-free bands, and there are no restrictions on what types of equipment can be used in any of them. The frequency ranges …

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