350-401 Question 161
Single answerYou are troubleshooting a wireless network where users are reporting intermittent connectivity issues and slow performance. Upon investigation, you notice the following: the RSSI for affected clients is around -75 dBm, the noise floor is -90 dBm, and the Signal-to-Noise Ratio (SNR) is 15 dB. What is the most likely cause of the connectivity issues?
- A
The RSSI is too weak for reliable communication.
- B
The noise floor is too high, causing interference.
- C
The SNR is too low for stable connections.
- D
The wireless client devices have incompatible capabilities.
Show answer and explanation
Correct answer: C
Explanation
The Signal-to-Noise Ratio (SNR) is a critical parameter for wireless network performance. A low SNR, such as 15 dB, can result in poor connectivity, packet loss, and slow performance. While RSSI and noise floor are important factors, the primary issue here is the insufficient SNR, which indicates that the signal strength is too close to the noise level for reliable operation.
- A. Incorrect.
While the RSSI of -75 dBm is not ideal, it is still within the acceptable range for wireless communication. This is not the primary cause of the issue.
- B. Incorrect.
The noise floor at -90 dBm is relatively low and is not likely to cause interference. This option is incorrect.
- C. Correct.
An SNR of 15 dB is below the recommended level for stable wireless connections. A low SNR can lead to poor performance and connectivity issues, making this the correct answer.
- D. Incorrect.
Wireless client device incompatibility is unlikely to cause intermittent issues related to signal and noise. This option is incorrect.