350-401 Question #1340: Real Exam Question with Answer & Explanation

Question

Why would a spectrum analyzer be used during a wireless survey?

Options

• Ato perform over the air packet captures
• Bto identify sources of non-802.11 interference
• Cto measure real-time throughput and bandwidth
• Dto display EIRP values of client devices

Explanation

Spectrum Analyzer in Wireless Surveys

A spectrum analyzer examines the raw RF (radio frequency) energy across a range of frequencies, making it the ideal tool for detecting non-802.11 interference sources such as microwave ovens, baby monitors, Bluetooth devices, and cordless phones - things that a standard Wi-Fi analyzer would completely miss. Option A (packet captures) is the role of a protocol analyzer like Wireshark, not a spectrum analyzer, which operates at the physical RF layer rather than the packet/data layer. Option C (measuring throughput and bandwidth) is performed by network performance testing tools like iPerf, while Option D (displaying EIRP values) would be handled by Wi-Fi analyzers or access point management tools that interpret 802.11 beacon data.

🧠 Memory Tip: Think of a spectrum analyzer as a "radio energy detective" - it sees all RF energy regardless of protocol. If it doesn't understand Wi-Fi packets, it certainly isn't measuring them; it's purely looking at the physical spectrum for anything that could cause interference.

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