Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsMedium
A user reports slow network performance and frequent disconnections on their laptop when connected to the office Wi-Fi. Other wired devices on the network are performing normally. The office uses multiple wireless access points (APs) across different channels. What is the most likely cause of the user's issue?
- AIP address conflict
- BDHCP server failure
- CChannel interference
- DISP outage
Show answer & explanationAnswer & explanation
Correct answer: C. Channel interference
Slow performance and frequent disconnections on a wireless network, especially when wired connections are fine and multiple APs are in use, strongly suggest channel interference. This occurs when APs or other wireless devices operate on overlapping channels, causing signals to conflict. DHCP failure or IP conflicts would likely prevent connection entirely, and an ISP outage would affect all internet-connected devices.
Why the other options are wrong
- A. An IP address conflict would typically prevent the device from connecting to the network at all, or cause very specific, immediate connectivity issues, not necessarily intermittent slowness.
- B. A DHCP server failure would prevent the laptop from obtaining an IP address, leading to no connection, not just slow performance and disconnections.
- D. An ISP outage would affect all devices trying to access the internet, including wired ones, which are reported to be working normally.
Wireless Channel Interference
Wireless channel interference occurs when multiple wireless devices or access points operate on the same or overlapping frequency channels, causing signals to collide and degrade performance.
- Common in dense wireless environments.
- Leads to slow speeds, dropped connections, and reduced range.
- Mitigated by selecting non-overlapping channels (e.g., 1, 6, 11 for 2.4 GHz).
Memory trick: Interfering Channels Cause Chaotic Connections.