3742860
| Question | Answer |
| L2 Retransmissions | When MAC sublayer frame is not acknowledged. |
| Aggregate Frame retransmissions | Retransmitted if one of the aggregate frames is corrupted |
| Causes of retransmissions | Multipath RF interference Low SNR |
| RF Interference | Strong transmitting amplitude from another radio during CCA |
| Narrowband Interference | High amplitude source of interference |
| Wideband Interference | Disrupts entire frequency band. |
| Can cause inter symbol interference. | Multipath |
| Adjacent Channel Interference | From overlapping frequency space. |
| Low SNR | Background noise too close to received signal or received signal is too low. |
| Near/Far | Low-powered clients at greater distances to the AP will be unheard. |
| DRS | Dynamic Rate Switching. Clients moving away from AP shift to lower rates and less complex MCS. |
| Co-channel Interference | APs on the same channel, contending for medium. Increases overhead. |
| Variables that affect range of WLAN | Transmission power rates. Antenna gain. Antenna type. Wavelength. FSPL. Physical environment. |
| Variables that affect throughput of WLAN | CSMA/CA. Encryption. Application use. Number of clients. L2 retransmissions. |
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