CWNA Regulatory Frameworks & Compliance 5 — Questions and Answers
Question 1: What is the non-interference, non-protection basis that all Part 15 devices must operate under?
- Unlicensed devices must not cause harmful interference and must accept interference from other sources (Correct answer)
- Unlicensed devices may transmit only on frequencies not occupied by licensed services
- Unlicensed devices must register with the FCC before operation above 100 mW
- Unlicensed devices are protected from interference if operating at or below 1 W EIRP
Correct answer: Unlicensed devices must not cause harmful interference and must accept interference from other sources
The fundamental Part 15 condition is that devices accept all interference received and may not cause harmful interference to licensed operations.
Question 2: Which 5 GHz UNII sub-band is shared with Terminal Doppler Weather Radar (TDWR) and requires the strictest DFS parameters?
- UNII-2C (5.47–5.725 GHz) (Correct answer)
- UNII-1 (5.15–5.25 GHz)
- UNII-2 (5.25–5.35 GHz)
- UNII-3 (5.725–5.850 GHz)
Correct answer: UNII-2C (5.47–5.725 GHz)
UNII-2C overlaps with TDWR frequencies, requiring Wi-Fi devices to implement DFS with a 30-minute non-occupancy period after radar detection.
Question 3: What does the FCC Telecommunications Certification Body (TCB) program allow?
- Private accredited labs to grant FCC equipment certifications on behalf of the FCC (Correct answer)
- Manufacturers to self-certify equipment without third-party testing
- Foreign regulatory bodies to grant FCC authorization directly
- The FCC to expedite certification for military communications equipment
Correct answer: Private accredited labs to grant FCC equipment certifications on behalf of the FCC
TCBs are accredited third-party organizations that can issue FCC certifications (ID grants), reducing the FCC's own workload while maintaining technical standards.
Question 4: A company is planning outdoor 5 GHz Wi-Fi across a campus. Which band should they use to avoid mandatory DFS radar scanning overhead?
- UNII-3 (5.725–5.850 GHz) (Correct answer)
- UNII-2 (5.25–5.35 GHz)
- UNII-2C (5.47–5.725 GHz)
- UNII-1 (5.15–5.25 GHz)
Correct answer: UNII-3 (5.725–5.850 GHz)
UNII-3 does not require DFS, making it the preferred outdoor 5 GHz band where a 60-second CAC delay is undesirable.
Question 5: What maximum EIRP does FCC Part 15.247 permit for point-to-point 2.4 GHz links using a directional antenna?
- 4 W (36 dBm) (Correct answer)
- 1 W (30 dBm)
- 2 W (33 dBm)
- 500 mW (27 dBm)
Correct answer: 4 W (36 dBm)
For point-to-point 2.4 GHz links, FCC Part 15.247 allows up to 4 W (36 dBm) EIRP when a directional antenna reduces co-channel interference.
Question 6: Which regulatory compliance marking is required for wireless devices sold in Japan?
- TELEC (Telecom Engineering Center) mark (Correct answer)
- FCC ID
- CE mark
- RCM mark
Correct answer: TELEC (Telecom Engineering Center) mark
Japan requires the TELEC certification mark, issued after testing by the Telecom Engineering Center, for radio equipment sold in Japan.
Question 7: Under WPA3-Enterprise, what is the minimum PMF (Protected Management Frame) requirement?
- PMF is mandatory (required) (Correct answer)
- PMF is optional but recommended
- PMF is not supported under WPA3-Enterprise
- PMF is only required for 6 GHz operation
Correct answer: PMF is mandatory (required)
WPA3-Enterprise mandates 802.11w (PMF) to protect management frames from eavesdropping and spoofing attacks.
CWNA Regulatory Frameworks & Compliance 5
What is the non-interference, non-protection basis that all Part 15 devices must operate under?