28. Which of the following is the most likely cause of the user's network issue?
Answer: B
The network has too much overlap.
The most likely cause of the user's network issue is that the network has too much overlap. The technician's review of the packet capture showing retransmitted frames indicates that there may be interference or congestion due to overlapping channels among the mesh nodes.
A) The SSIDs should not be the same.
This option is incorrect because having the same SSID for a mesh network is standard practice. It allows devices to seamlessly connect to the strongest node without user intervention. The issue at hand is not related to the SSID configuration but rather to the network's performance.
B) The network has too much overlap.
This option is correct as it aligns with the technician's findings of retransmitted frames in the packet capture. The RSSI values indicate varying signal strengths, which suggest that there may be interference from overlapping channels, especially since all nodes use channel 11. This overlap can lead to increased latency and poor performance.
C) The devices are incompatible with the mesh network.
This option is incorrect because compatibility issues would typically manifest in connectivity problems rather than latency. The technician has already rebooted the devices and performed a site survey, which suggests that the devices are functioning correctly within the mesh network.
D) The nodes are underpowered.
This option is also incorrect. While underpowered nodes can affect performance, the evidence from the packet capture showing retransmissions points more towards interference from channel overlap rather than insufficient power. If the nodes were underpowered, it would likely lead to connectivity issues rather than just latency.
Conclusion
In summary, the evidence of retransmitted frames and the overlapping RSSI values strongly indicate that the network's performance issues stem from too much overlap among the mesh nodes. Other options either misinterpret the situation or fail to account for the observed data, making option B the most plausible explanation for the network latency issues.