20 Myths of Wi-Fi Interference (Cisco)

Read the full list here.

• Myth #1: "The only interference problems are from other 802.11 networks."
• Myth #2: "My network seems to be working, so interference must not be a problem." 
• Myth #3: "I did an RF sweep before deployment. So I found all the interference sources."
• Myth #4: "My infrastructure equipment automatically detects interference."
• Myth #5: "I can overcome interference by having a high density of access points."
• Myth #6: "I can analyze interference problems with my packet sniffer." 
• Myth #7: "I have a wireless policy that doesn't allow interfering devices into the premises."
• Myth #8: "There is no interference at 5 GHz."
• Myth #9: "I'll hire a consultant to solve any interference problems I run into."
• Myth #10: "I give up. RF is impossible to understand."
• Myth #11: "Wi-Fi interference doesn't happen very often."
• Myth #12: "I should look for interference only after ruling out other problem sources."
• Myth #13: "There's nothing I can do about interference if I find it."
• Myth #14: "There are just a few easy-to-find devices that can interfere with my Wi-Fi."
• Myth #15: "When interference occurs, the impact on data is typically minor."
• Myth #16 "Voice data rates are low, so the impact of interference on voice over Wi-Fi should be minimal." 
• Myth #17: "Interference is a performance problem, but not a security risk."
• Myth #18: "802.11n and antenna systems will work around any interference issues."
• Myth #19: "My site survey tool can be used to find interference problems."
• Myth #20: "RF analysis tools are too bulky and too expensive."