350-401 Question #538: Real Exam Question with Answer & Explanation

Question

What is a characteristic of Wi-Fi channels?

Options

• AThe 2.4-GHz band has 24 non-overlapping channels.
• BDevices that connect to the same Wi-Fi channel reside in the same collision domain.
• CWi-Fi channels are spaced 30 MHz apart.
• DThe 5-GHz band offers 11 different channels for Wi-Fi clients.

Explanation

Within Wi-Fi networks, all devices connected to the same channel operate within a single collision domain, as they share the same half-duplex medium.

Common mistakes.

• A. The 2.4-GHz band typically has 3 non-overlapping channels (1, 6, 11) in North America, not 24.
• C. Wi-Fi channels are typically spaced 5 MHz apart (e.g., 2.4 GHz) or have specific center frequencies (e.g., 5 GHz), not universally 30 MHz apart.
• D. The 5-GHz band offers many more non-overlapping channels than 11, often 20+ depending on regulatory domain and DFS usage.

Concept tested. Wi-Fi collision domains

Reference. https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan/113437-wlan-channels.html

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