Huawei Certified ICT Associate – WLAN (HCIA-WLAN) — Question 18

Which of the following statements about ISM frequency bands are true? (Choose all that apply.)

Answer options

• A. ISM frequency bands are reserved for international, scientific, and medical (ISM) purposes.
• B. ISM frequency bands lower WLAN costs but bring a lot of co channel interference.
• C. No license or fee is required for using ISM frequency bands.
• D. The 2.4 GHz and 5 GHz frequency bands used by WLAN both belong to ISM frequency bands.

Correct answer: B, D

Explanation

Option B is correct because while ISM bands do lower costs for WLAN, they also lead to significant co-channel interference due to the lack of regulation. Option D is also correct as both 2.4 GHz and 5 GHz bands are classified under ISM. Options A and C are misleading; ISM bands are indeed reserved for specific purposes, but they are mostly unregulated in terms of licensing, which does not make them true statements in this context.