Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsMedium
A network technician is troubleshooting slow wireless performance in a densely populated apartment building. They notice that many neighboring Wi-Fi networks are operating on the same 2.4 GHz channels. What is the most likely cause of the slow performance?
- AOutdated network drivers on client devices.
- BInsufficient DHCP address pool.
- CWireless channel interference.
- DIncorrect WPA2/WPA3 encryption settings.
Show answer & explanationAnswer & explanation
Correct answer: C. Wireless channel interference.
When multiple Wi-Fi networks operate on the same or overlapping channels in the 2.4 GHz band, it leads to co-channel interference, causing slower speeds, dropped connections, and overall poor wireless performance.
Why the other options are wrong
- A. Outdated drivers can cause various issues, but widespread slow performance across multiple devices in a dense area points more strongly to environmental interference.
- B. An insufficient DHCP pool would prevent new devices from getting an IP address, but wouldn't directly cause slow performance for connected devices.
- D. Incorrect encryption settings would typically prevent connection entirely, not just cause slow performance.
Wireless Channel Interference
Wireless channel interference occurs when multiple wireless devices or networks transmit on the same or overlapping frequency channels, causing signal degradation and reduced performance.
- Most common in the 2.4 GHz band due to fewer non-overlapping channels.
- Causes slower speeds, dropped connections, and increased latency.
- Can be mitigated by selecting less congested channels or using the 5 GHz band.
Memory trick: Interference: Slows Signals, Stops Smoothness.