300-360 · Question #69
What two factors could cause a post-deployment audit to show a high retransmission rate for the WLAN? (Choose two.)
The correct answer is A. CRC errors B. Rate shifting. CRC (Cyclic Redundancy Check) errors indicate corrupted frames caused by interference, noise, or multipath issues. When a frame fails its CRC check, it must be retransmitted, directly increasing the retransmission rate. Rate shifting occurs when a client or AP dynamically…
Question
What two factors could cause a post-deployment audit to show a high retransmission rate for the WLAN? (Choose two.)
Options
- ACRC errors
- BRate shifting
- CCCX compatible clients
- DHigh SNR values
- EHigh RSSI values
How the community answered
(54 responses)- A50% (27)
- C30% (16)
- D13% (7)
- E7% (4)
Explanation
CRC (Cyclic Redundancy Check) errors indicate corrupted frames caused by interference, noise, or multipath issues. When a frame fails its CRC check, it must be retransmitted, directly increasing the retransmission rate. Rate shifting occurs when a client or AP dynamically reduces its data rate in response to poor RF conditions (weak signal, interference). Operating at lower rates is less efficient and more prone to errors, causing more retransmissions. High SNR (Signal-to-Noise Ratio) and high RSSI (Received Signal Strength Indicator) are both indicators of a healthy RF environment and would not cause high retransmissions. CCX (Cisco Compatible Extensions) is a client interoperability standard and is not a cause of retransmissions.
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