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Exam Code: N10-009
Exam Name: CompTIA Network+
Certification Provider: CompTIA
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CompTIA Network+ N10-009 Practice Test 40

Question 390

VoIP handsets suffer high jitter when scanning channels midcall. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Read overall throughput but not RTP jitter during a real midcall roam
  2. Measure packet jitter, reassociation time and roaming triggers
  3. Verify phones can register to SIP while disregarding disassociation and reassociation duration
  4. Inspect one fixed handset at the desk instead of walking between AP cells under load

Explanation

Correct Answer

B:

Roaming interruption and congestion are distinct voice quality causes. The result of the remedy is checked directly: Measure packet jitter, reassociation time and roaming triggers.

Incorrect Answers

A:

Read overall throughput but not RTP jitter during a real midcall roam. Roaming interruption and congestion are distinct voice quality causes. The appropriate acceptance test is: Measure packet jitter, reassociation time and roaming triggers.

C:

Verify phones can register to SIP while disregarding disassociation and reassociation duration. Roaming interruption and congestion are distinct voice quality causes. The appropriate acceptance test is: Measure packet jitter, reassociation time and roaming triggers.

D:

Inspect one fixed handset at the desk instead of walking between AP cells under load. Roaming interruption and congestion are distinct voice quality causes. The appropriate acceptance test is: Measure packet jitter, reassociation time and roaming triggers.

Question 391

A 2.4 GHz WLAN becomes unusable after a microwave appliance is installed. Which response MOST directly addresses the stated network problem or requirement?

  1. Change DHCP lease duration rather than locate microwave-generated non-Wi-Fi interference
  2. Force the WLAN to remain on the interfered 2.4GHz frequency at higher transmit power
  3. Identify non-802.11 interference and reposition/retune WLAN
  4. Add more AP beacons to the microwave-affected channel without a spectrum survey

Explanation

Correct Answer

C:

Non-Wi-Fi noise is not necessarily another AP on same channel. A direct way to confirm the outcome is to use spectrum observations and airtime errors during appliance use.

Incorrect Answers

A:

Change DHCP lease duration rather than locate microwave-generated non-Wi-Fi interference. Non-Wi-Fi noise is not necessarily another AP on same channel. This does not implement the needed approach: identify non-802.11 interference and reposition/retune WLAN.

B:

Force the WLAN to remain on the interfered 2.4GHz frequency at higher transmit power. Non-Wi-Fi noise is not necessarily another AP on same channel. This does not implement the needed approach: identify non-802.11 interference and reposition/retune WLAN.

D:

Add more AP beacons to the microwave-affected channel without a spectrum survey. Non-Wi-Fi noise is not necessarily another AP on same channel. This does not implement the needed approach: identify non-802.11 interference and reposition/retune WLAN.

Question 392

A 2.4 GHz WLAN becomes unusable after a microwave appliance is installed. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Check signal strength when the microwave is off and assume the channel stays clean
  2. Measure ISP latency instead of correlating microwave cycles with RF spectrum bursts
  3. Verify an SSID remains broadcast while repeated wireless frame errors occur
  4. Use spectrum observations and airtime errors during appliance use

Explanation

Correct Answer

D:

Non-Wi-Fi noise is not necessarily another AP on same channel. The result of the remedy is checked directly: Use spectrum observations and airtime errors during appliance use.

Incorrect Answers

A:

Check signal strength when the microwave is off and assume the channel stays clean. Non-Wi-Fi noise is not necessarily another AP on same channel. The appropriate acceptance test is: Use spectrum observations and airtime errors during appliance use.

B:

Measure ISP latency instead of correlating microwave cycles with RF spectrum bursts. Non-Wi-Fi noise is not necessarily another AP on same channel. The appropriate acceptance test is: Use spectrum observations and airtime errors during appliance use.

C:

Verify an SSID remains broadcast while repeated wireless frame errors occur. Non-Wi-Fi noise is not necessarily another AP on same channel. The appropriate acceptance test is: Use spectrum observations and airtime errors during appliance use.

Question 393

A guest SSID shares the corporate network's client-to-client broadcast access. Which response MOST directly addresses the stated network problem or requirement?

  1. Enforce guest VLAN and WLAN client-isolation as appropriate
  2. Place corporate and guest users in one unisolated L2 segment because both know the SSID
  3. Disable guest client isolation while retaining unrestricted peer-to-peer traffic
  4. Implement portal authentication but allow guests to reach internal VLANs by direct IP

Explanation

Correct Answer

A:

L3 guest segmentation and wireless client isolation solve different exposure paths. A direct way to confirm the outcome is to attempt direct guest-to-guest and guest-to-corporate access.

Incorrect Answers

B:

Place corporate and guest users in one unisolated L2 segment because both know the SSID. L3 guest segmentation and wireless client isolation solve different exposure paths. This does not implement the needed approach: enforce guest VLAN and WLAN client-isolation as appropriate.

C:

Disable guest client isolation while retaining unrestricted peer-to-peer traffic. L3 guest segmentation and wireless client isolation solve different exposure paths. This does not implement the needed approach: enforce guest VLAN and WLAN client-isolation as appropriate.

D:

Implement portal authentication but allow guests to reach internal VLANs by direct IP. L3 guest segmentation and wireless client isolation solve different exposure paths. This does not implement the needed approach: enforce guest VLAN and WLAN client-isolation as appropriate.

Question 394

A guest SSID shares the corporate network's client-to-client broadcast access. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm the guest receives DNS but never attempt guest-to-corporate access
  2. Attempt direct guest-to-guest and guest-to-corporate access
  3. Show the Wi-Fi controller has a guest role label without testing client separation
  4. Check only Internet browsing while guest-to-guest L2 forwarding remains available against policy

Explanation

Correct Answer

B:

L3 guest segmentation and wireless client isolation solve different exposure paths. The result of the remedy is checked directly: Attempt direct guest-to-guest and guest-to-corporate access.

Incorrect Answers

A:

Confirm the guest receives DNS but never attempt guest-to-corporate access. L3 guest segmentation and wireless client isolation solve different exposure paths. The appropriate acceptance test is: Attempt direct guest-to-guest and guest-to-corporate access.

C:

Show the Wi-Fi controller has a guest role label without testing client separation. L3 guest segmentation and wireless client isolation solve different exposure paths. The appropriate acceptance test is: Attempt direct guest-to-guest and guest-to-corporate access.

D:

Check only Internet browsing while guest-to-guest L2 forwarding remains available against policy. L3 guest segmentation and wireless client isolation solve different exposure paths. The appropriate acceptance test is: Attempt direct guest-to-guest and guest-to-corporate access.

Question 395

An AP with 80 MHz channels operates beside dense neighbor APs. Which response MOST directly addresses the stated network problem or requirement?

  1. Increase every neighboring 5GHz AP to 160MHz channels despite heavy overlap
  2. Set two adjacent APs to the same wide frequency range and expect fewer retries
  3. Evaluate narrower channel plan and contiguous clear spectrum
  4. Disable adaptive channel planning and trust configured peak PHY rate to ensure capacity

Explanation

Correct Answer

C:

Channel bandwidth increases spectrum footprint. A direct way to confirm the outcome is to record co-channel overlap and packet retries.

Incorrect Answers

A:

Increase every neighboring 5GHz AP to 160MHz channels despite heavy overlap. Channel bandwidth increases spectrum footprint. This does not implement the needed approach: evaluate narrower channel plan and contiguous clear spectrum.

B:

Set two adjacent APs to the same wide frequency range and expect fewer retries. Channel bandwidth increases spectrum footprint. This does not implement the needed approach: evaluate narrower channel plan and contiguous clear spectrum.

D:

Disable adaptive channel planning and trust configured peak PHY rate to ensure capacity. Channel bandwidth increases spectrum footprint. This does not implement the needed approach: evaluate narrower channel plan and contiguous clear spectrum.

Question 396

An AP with 80 MHz channels operates beside dense neighbor APs. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Read SSID broadcast state but not busy-channel and retry counters
  2. Test an AP alone with neighboring radios off and infer the congested deployment works
  3. Inspect the channel number without measuring overlapping occupied spectrum
  4. Record co-channel overlap and packet retries

Explanation

Correct Answer

D:

Channel bandwidth increases spectrum footprint. The result of the remedy is checked directly: Record co-channel overlap and packet retries.

Incorrect Answers

A:

Read SSID broadcast state but not busy-channel and retry counters. Channel bandwidth increases spectrum footprint. The appropriate acceptance test is: Record co-channel overlap and packet retries.

B:

Test an AP alone with neighboring radios off and infer the congested deployment works. Channel bandwidth increases spectrum footprint. The appropriate acceptance test is: Record co-channel overlap and packet retries.

C:

Inspect the channel number without measuring overlapping occupied spectrum. Channel bandwidth increases spectrum footprint. The appropriate acceptance test is: Record co-channel overlap and packet retries.

Question 397

A managed site sees APs mysteriously switch channels during business hours. Which response MOST directly addresses the stated network problem or requirement?

  1. Inspect RRM/channel optimization events and planned limits
  2. Disable all RRM event logs while AP radios continue changing channels unexpectedly
  3. Change the user DHCP scope to prevent controller-driven channel switches
  4. Allow every AP to run unrestricted channel automation despite documented business-hour disruption

Explanation

Correct Answer

A:

Automatic channel assignment can produce its own mobility events. A direct way to confirm the outcome is to correlate controller reconfiguration with interference and user reports.

Incorrect Answers

B:

Disable all RRM event logs while AP radios continue changing channels unexpectedly. Automatic channel assignment can produce its own mobility events. This does not implement the needed approach: inspect RRM/channel optimization events and planned limits.

C:

Change the user DHCP scope to prevent controller-driven channel switches. Automatic channel assignment can produce its own mobility events. This does not implement the needed approach: inspect RRM/channel optimization events and planned limits.

D:

Allow every AP to run unrestricted channel automation despite documented business-hour disruption. Automatic channel assignment can produce its own mobility events. This does not implement the needed approach: inspect RRM/channel optimization events and planned limits.

Question 398

A managed site sees APs mysteriously switch channels during business hours. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm the current channel but never compare historical radio moves and user complaints
  2. Correlate controller reconfiguration with interference and user reports
  3. Inspect controller uptime without checking the scheduled RRM optimization log
  4. Test one client between channel changes and infer roaming disruptions never occur

Explanation

Correct Answer

B:

Automatic channel assignment can produce its own mobility events. The result of the remedy is checked directly: Correlate controller reconfiguration with interference and user reports.

Incorrect Answers

A:

Confirm the current channel but never compare historical radio moves and user complaints. Automatic channel assignment can produce its own mobility events. The appropriate acceptance test is: Correlate controller reconfiguration with interference and user reports.

C:

Inspect controller uptime without checking the scheduled RRM optimization log. Automatic channel assignment can produce its own mobility events. The appropriate acceptance test is: Correlate controller reconfiguration with interference and user reports.

D:

Test one client between channel changes and infer roaming disruptions never occur. Automatic channel assignment can produce its own mobility events. The appropriate acceptance test is: Correlate controller reconfiguration with interference and user reports.

Question 399

An open outdoor campus requires a directional sector to reach a long walkway. Which response MOST directly addresses the stated network problem or requirement?

  1. Install indoor omnidirectional antennas at one end of a long outdoor walkway with insufficient directional coverage
  2. Use an unapproved transmit power that violates local regulatory EIRP limits
  3. Select outdoor-rated directional antennas and safe power/channel limits
  4. Point the outdoor sector away from the pedestrian path and assume extra radio speed compensates

Explanation

Correct Answer

C:

Directional coverage improves reach only in intended azimuth. A direct way to confirm the outcome is to map outdoor coverage and interference boundary after deployment.

Incorrect Answers

A:

Install indoor omnidirectional antennas at one end of a long outdoor walkway with insufficient directional coverage. Directional coverage improves reach only in intended azimuth. This does not implement the needed approach: select outdoor-rated directional antennas and safe power/channel limits.

B:

Use an unapproved transmit power that violates local regulatory EIRP limits. Directional coverage improves reach only in intended azimuth. This does not implement the needed approach: select outdoor-rated directional antennas and safe power/channel limits.

D:

Point the outdoor sector away from the pedestrian path and assume extra radio speed compensates. Directional coverage improves reach only in intended azimuth. This does not implement the needed approach: select outdoor-rated directional antennas and safe power/channel limits.

Question 400

An open outdoor campus requires a directional sector to reach a long walkway. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Read antenna gain specifications without surveying walkway signal along the intended sector
  2. Measure RSSI only near the AP rather than at the far edge and neighboring interference zones
  3. Confirm the AP operates on a channel without checking approved outdoor power and coverage boundary
  4. Map outdoor coverage and interference boundary after deployment

Explanation

Correct Answer

D:

Directional coverage improves reach only in intended azimuth. The result of the remedy is checked directly: Map outdoor coverage and interference boundary after deployment.

Incorrect Answers

A:

Read antenna gain specifications without surveying walkway signal along the intended sector. Directional coverage improves reach only in intended azimuth. The appropriate acceptance test is: Map outdoor coverage and interference boundary after deployment.

B:

Measure RSSI only near the AP rather than at the far edge and neighboring interference zones. Directional coverage improves reach only in intended azimuth. The appropriate acceptance test is: Map outdoor coverage and interference boundary after deployment.

C:

Confirm the AP operates on a channel without checking approved outdoor power and coverage boundary. Directional coverage improves reach only in intended azimuth. The appropriate acceptance test is: Map outdoor coverage and interference boundary after deployment.

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