350-401 Question 163
Single answerA network administrator is troubleshooting a wireless performance issue in a high-density office environment. The users report intermittent connectivity and slow speeds. Upon investigation, the administrator observes the following:
- RSSI values are between -55 dBm and -65 dBm for affected users.
- The Signal-to-Noise Ratio (SNR) is measured at 18 dB.
- Multiple devices are operating on overlapping 2.4 GHz channels.
What is MOST likely causing the performance issue?
- A
Low Signal Strength (RSSI)
- B
Poor Signal-to-Noise Ratio (SNR)
- C
Channel interference on the 2.4 GHz band
- D
Client device capabilities are mismatched with the network
Show answer and explanation
Correct answer: C
Explanation
The primary issue in this scenario is channel interference on the 2.4 GHz band due to overlapping channels. This is common in high-density environments where multiple access points and devices operate in the same frequency range. Although the RSSI and SNR values are not ideal, they are not the primary cause of the reported performance issues. Moving to non-overlapping channels or using the 5 GHz band could mitigate the interference.
- A. Incorrect.
The RSSI values between -55 dBm and -65 dBm indicate strong signal strength, so this is unlikely to be the issue.
- B. Incorrect.
While an SNR of 18 dB is on the lower side, it is still acceptable for most wireless communications, and the symptoms described do not directly point to it as the main issue.
- C. Correct.
Overlapping channels in the crowded 2.4 GHz band can cause significant interference, leading to slower speeds and intermittent connectivity, which matches the symptoms.
- D. Incorrect.
There is no evidence in the scenario to suggest that client device capabilities are mismatched with the network configuration.