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CompTIA N10-009 Practice Test 28

Question 270

A network team observes: Three nearby access points use channels 1, 2, and 3 and clients have high retries despite strong RSSI. What is the MOST appropriate corrective action or technical decision?

  1. Use DFS-compliant operation or plan a suitable non-DFS channel if needed.
  2. Plan nonoverlapping 20MHz channels such as 1, 6, 11 in the permitted regulatory domain.
  3. Reduce channel width where dense deployments need more independent channels.
  4. Keep a common enterprise SSID while allowing each radio its distinct BSSID.

Explanation

Correct Answer

B:

Narrow nonoverlapping channels reduce contention and interference. Overlapping 2.4ghz channels create adjacent-channel interference.

Incorrect Answers

A:

Using DFS-compliant operation or plan a suitable non-DFS channel if needed would not plan nonoverlapping 20MHz channels such as 1, 6, 11 in the permitted regulatory domain.

C:

Reduce channel width where dense deployments need more independent channels would not plan nonoverlapping 20MHz channels such as 1, 6, 11 in the permitted regulatory domain.

D:

Keeping a common enterprise SSID while allowing each radio its distinct BSSID would not plan nonoverlapping 20MHz channels such as 1, 6, 11 in the permitted regulatory domain.

Question 271

A network team addresses this situation: Three nearby access points use channels 1, 2, and 3 and clients have high retries despite strong RSSI. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Inspect controller DFS event log and observed channel migration.
  2. Measure aggregate cell throughput and contention after reducing width.
  3. Measure retry rate after channel survey and retuning.
  4. Observe one client moving across APs and BSSID changes without losing service.

Explanation

Correct Answer

C:

Improved retries under load validate channel plan.

Incorrect Answers

A:

Event and move confirm correct DFS handling. It does not measure retry rate after channel survey and retuning.

B:

Area throughput validates the dense RF tradeoff. It does not measure retry rate after channel survey and retuning.

D:

Changed BSSID with stable service confirms roaming. It does not measure retry rate after channel survey and retuning.

Question 272

A network specialist investigates this evidence: Three nearby access points use channels 1, 2, and 3 and clients have high retries despite strong RSSI. Which underlying condition BEST explains the observed failure or requirement?

  1. DFS regulation requires vacating radar-sensitive channels.
  2. Guest access lacks captive acknowledgement and segmentation.
  3. Enterprise authentication infrastructure is unavailable for casual guests.
  4. Overlapping 2.4GHz channels create adjacent-channel interference.

Explanation

Correct Answer

D:

Overlapping 2.4GHz channels create adjacent-channel interference. Narrow nonoverlapping channels reduce contention and interference.

Incorrect Answers

A:

Regulatory radar protection supersedes static channel preference. That does not establish overlapping 2.4GHz channels create adjacent-channel interference.

B:

Guest access lacks captive acknowledgement and segmentation. That does not establish overlapping 2.4GHz channels create adjacent-channel interference.

C:

Enterprise authentication infrastructure is unavailable for casual guests. That does not establish overlapping 2.4GHz channels create adjacent-channel interference.

Question 273

A network team observes: A 5GHz access point suddenly changes channel after radar is detected and some clients disconnect briefly. What is the MOST appropriate corrective action or technical decision?

  1. Use DFS-compliant operation or plan a suitable non-DFS channel if needed.
  2. Plan nonoverlapping 20MHz channels such as 1, 6, 11 in the permitted regulatory domain.
  3. Reduce channel width where dense deployments need more independent channels.
  4. Apply suitable band steering and maintain acceptable 2.4GHz coverage for legacy devices.

Explanation

Correct Answer

A:

Regulatory radar protection supersedes static channel preference. Dfs regulation requires vacating radar-sensitive channels.

Incorrect Answers

B:

Planning nonoverlapping 20MHz channels such as 1, 6, 11 in the permitted regulatory domain would not meet the need for dFS-compliant operation or plan a suitable non-DFS channel if needed.

C:

Reduce channel width where dense deployments need more independent channels would not meet the need for dFS-compliant operation or plan a suitable non-DFS channel if needed.

D:

Applying suitable band steering and maintaining acceptable 2.4GHz coverage for legacy devices would not meet the need for dFS-compliant operation or plan a suitable non-DFS channel if needed.

Question 274

A network team addresses this situation: A 5GHz access point suddenly changes channel after radar is detected and some clients disconnect briefly. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Measure aggregate cell throughput and contention after reducing width.
  2. Inspect controller DFS event log and observed channel migration.
  3. Measure retry rate after channel survey and retuning.
  4. Accept portal and test internet versus internal printer reachability.

Explanation

Correct Answer

B:

Event and move confirm correct DFS handling.

Incorrect Answers

A:

Area throughput validates the dense RF tradeoff. It does not inspect controller DFS event log and observed channel migration.

C:

That test concerns 2.4ghz channel overlap rather than the specific reported condition. Event and move confirm correct DFS handling.

D:

Guest success and internal denial validate both rules. It does not inspect controller DFS event log and observed channel migration.

Question 275

A network specialist investigates this evidence: A 5GHz access point suddenly changes channel after radar is detected and some clients disconnect briefly. Which underlying condition BEST explains the observed failure or requirement?

  1. Overlapping 2.4GHz channels create adjacent-channel interference.
  2. Wide channels reduce usable nonoverlapping channel choices.
  3. DFS regulation requires vacating radar-sensitive channels.
  4. Band choice is not optimized for supported clients.

Explanation

Correct Answer

C:

DFS regulation requires vacating radar-sensitive channels. Regulatory radar protection supersedes static channel preference.

Incorrect Answers

A:

This describes the 2.4ghz channel overlap mechanism, not the failure in this case. Regulatory radar protection supersedes static channel preference.

B:

Wide channels reduce usable nonoverlapping channel choices. That does not establish dFS regulation requires vacating radar-sensitive channels.

D:

Band choice is not optimized for supported clients. That does not establish dFS regulation requires vacating radar-sensitive channels.

Question 276

A network team observes: A site enables a 6GHz-only SSID but older laptops cannot find it while new devices connect. What is the MOST appropriate corrective action or technical decision?

  1. Adjust placement and applicable RTS/CTS or RF cell design.
  2. Apply suitable band steering and maintain acceptable 2.4GHz coverage for legacy devices.
  3. Keep a common enterprise SSID while allowing each radio its distinct BSSID.
  4. Provide an appropriate compatible 5GHz SSID or upgrade clients with 6GHz-capable radios.

Explanation

Correct Answer

D:

6GHz connectivity requires suitable client radio and regulatory support. Legacy radios cannot discover unsupported 6ghz bands.

Incorrect Answers

A:

Adjusting placement and applicable RTS/CTS or RF cell design would not provide an appropriate compatible 5GHz SSID or upgrade clients with 6GHz-capable radios.

B:

Applying suitable band steering and maintaining acceptable 2.4GHz coverage for legacy devices would not provide an appropriate compatible 5GHz SSID or upgrade clients with 6GHz-capable radios.

C:

Keeping a common enterprise SSID while allowing each radio its distinct BSSID would not provide an appropriate compatible 5GHz SSID or upgrade clients with 6GHz-capable radios.

Question 277

A network team addresses this situation: A site enables a 6GHz-only SSID but older laptops cannot find it while new devices connect. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Review client adapter capability and successful 5GHz association.
  2. Capture retries and frame timing after a controlled mitigation.
  3. Accept portal and test internet versus internal printer reachability.
  4. Survey signal and roaming across the intended aisle map.

Explanation

Correct Answer

A:

Review client adapter capability and successful 5GHz association.

Incorrect Answers

B:

Lower collision rate supports the hidden-node diagnosis. It does not review client adapter capability and successful 5GHz association.

C:

Guest success and internal denial validate both rules. It does not review client adapter capability and successful 5GHz association.

D:

Survey signal and roaming across the intended aisle map. It does not review client adapter capability and successful 5GHz association.

Question 278

A network specialist investigates this evidence: A site enables a 6GHz-only SSID but older laptops cannot find it while new devices connect. Which underlying condition BEST explains the observed failure or requirement?

  1. Hidden-station behavior causes collisions at the receiver.
  2. Legacy radios cannot discover unsupported 6GHz bands.
  3. Band choice is not optimized for supported clients.
  4. Antenna pattern does not concentrate power toward the far endpoint.

Explanation

Correct Answer

B:

Legacy radios cannot discover unsupported 6GHz bands. 6GHz connectivity requires suitable client radio and regulatory support.

Incorrect Answers

A:

Hidden-station behavior causes collisions at the receiver. That does not establish legacy radios cannot discover unsupported 6GHz bands.

C:

Band choice is not optimized for supported clients. That does not establish legacy radios cannot discover unsupported 6GHz bands.

D:

Antenna pattern does not concentrate power toward the far endpoint.

Question 279

A network team observes: Dual-band clients crowd 2.4GHz while 5GHz remains lightly used. What is the MOST appropriate corrective action or technical decision?

  1. Provide an appropriate compatible 5GHz SSID or upgrade clients with 6GHz-capable radios.
  2. Use DFS-compliant operation or plan a suitable non-DFS channel if needed.
  3. Apply suitable band steering and maintain acceptable 2.4GHz coverage for legacy devices.
  4. Reduce channel width where dense deployments need more independent channels.

Explanation

Correct Answer

C:

Capable devices can shift to less-congested 5GHz channels. Band choice is not optimized for supported clients.

Incorrect Answers

A:

Providing an appropriate compatible 5GHz SSID or upgrade clients with 6GHz-capable radios would not apply suitable band steering and maintain acceptable 2.4GHz coverage for legacy devices.

B:

Using DFS-compliant operation or plan a suitable non-DFS channel if needed would not apply suitable band steering and maintain acceptable 2.4GHz coverage for legacy devices.

D:

Reduce channel width where dense deployments need more independent channels would not apply suitable band steering and maintain acceptable 2.4GHz coverage for legacy devices.

Question 280

A network team addresses this situation: Dual-band clients crowd 2.4GHz while 5GHz remains lightly used. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Inspect controller DFS event log and observed channel migration.
  2. Review client adapter capability and successful 5GHz association.
  3. Measure aggregate cell throughput and contention after reducing width.
  4. Compare association distribution and throughput after steering.

Explanation

Correct Answer

D:

Migration without coverage loss validates steering.4ghz coverage for legacy devices.

Incorrect Answers

A:

Event and move confirm correct DFS handling. It does not compare association distribution and throughput after steering.

B:

Review client adapter capability and successful 5GHz association. It does not compare association distribution and throughput after steering.

C:

Area throughput validates the dense RF tradeoff.


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