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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 99

Question 980

A speed complaint needs actual throughput measured over a known test server. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Check link auto-negotiation at 1Gbps and report actual measured throughput equals 1Gbps
  2. Run one brief test with no repeat load and claim stable transfer capacity
  3. Test only downloads when the complaint includes upload performance
  4. Compare measured throughput in both directions under repeat load

Explanation

Correct Answer

D:

Speed tests reflect path conditions and endpoint capacity at test time. The result of the remedy is checked directly: Compare measured throughput in both directions under repeat load.

Incorrect Answers

A:

Check link auto-negotiation at 1Gbps and report actual measured throughput equals 1Gbps. Speed tests reflect path conditions and endpoint capacity at test time. The appropriate acceptance test is: Compare measured throughput in both directions under repeat load.

B:

Run one brief test with no repeat load and claim stable transfer capacity. Speed tests reflect path conditions and endpoint capacity at test time. The appropriate acceptance test is: Compare measured throughput in both directions under repeat load.

C:

Test only downloads when the complaint includes upload performance. Speed tests reflect path conditions and endpoint capacity at test time. The appropriate acceptance test is: Compare measured throughput in both directions under repeat load.

Question 981

An unlabeled copper run must be traced to the correct patch panel. Which response MOST directly addresses the stated network problem or requirement?

  1. Use toner and probe on safe isolated wiring
  2. Use a remote DNS lookup to identify an unlabeled passive patch-panel cable
  3. Inject a tone into a live PoE circuit without checking tester and device safety
  4. Rename switchports arbitrarily before tracing the physical copper run

Explanation

Correct Answer

A:

Toner identifies physical cable, not Wi-Fi channel. A direct way to confirm the outcome is to match tone at patch panel and confirm continuity.

Incorrect Answers

B:

Use a remote DNS lookup to identify an unlabeled passive patch-panel cable. Toner identifies physical cable, not Wi-Fi channel. This does not implement the needed approach: use toner and probe on safe isolated wiring.

C:

Inject a tone into a live PoE circuit without checking tester and device safety. Toner identifies physical cable, not Wi-Fi channel. This does not implement the needed approach: use toner and probe on safe isolated wiring.

D:

Rename switchports arbitrarily before tracing the physical copper run. Toner identifies physical cable, not Wi-Fi channel. This does not implement the needed approach: use toner and probe on safe isolated wiring.

Question 982

An unlabeled copper run must be traced to the correct patch panel. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm a tone can be heard near one cabinet without matching the target cable end
  2. Match tone at patch panel and confirm continuity
  3. Check one patch-panel port visually and assume all unlabeled drops have the same termination
  4. Read MAC address tables while the mystery disconnected cable cannot present an active MAC

Explanation

Correct Answer

B:

Toner identifies physical cable, not Wi-Fi channel. The result of the remedy is checked directly: Match tone at patch panel and confirm continuity.

Incorrect Answers

A:

Confirm a tone can be heard near one cabinet without matching the target cable end. Toner identifies physical cable, not Wi-Fi channel. The appropriate acceptance test is: Match tone at patch panel and confirm continuity.

C:

Check one patch-panel port visually and assume all unlabeled drops have the same termination. Toner identifies physical cable, not Wi-Fi channel. The appropriate acceptance test is: Match tone at patch panel and confirm continuity.

D:

Read MAC address tables while the mystery disconnected cable cannot present an active MAC. Toner identifies physical cable, not Wi-Fi channel. The appropriate acceptance test is: Match tone at patch panel and confirm continuity.

Question 983

A copper run is suspected to have one crossed pair after retermination. Which response MOST directly addresses the stated network problem or requirement?

  1. Replace the router's default route to fix a crossed copper pair at the patch termination
  2. Use a tone generator alone and assume it proves each pin lands on the correct opposite pin
  3. Use wiremap cable tester to identify pin mismatch
  4. Recrimp both ends arbitrarily without first determining the wiremap fault

Explanation

Correct Answer

C:

Pinout test detects cabling faults before IP configuration changes. A direct way to confirm the outcome is to re-test certified pairs after correction.

Incorrect Answers

A:

Replace the router's default route to fix a crossed copper pair at the patch termination. Pinout test detects cabling faults before IP configuration changes. This does not implement the needed approach: use wiremap cable tester to identify pin mismatch.

B:

Use a tone generator alone and assume it proves each pin lands on the correct opposite pin. Pinout test detects cabling faults before IP configuration changes. This does not implement the needed approach: use wiremap cable tester to identify pin mismatch.

D:

Recrimp both ends arbitrarily without first determining the wiremap fault. Pinout test detects cabling faults before IP configuration changes. This does not implement the needed approach: use wiremap cable tester to identify pin mismatch.

Question 984

A copper run is suspected to have one crossed pair after retermination. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm simple end-to-end continuity exists but never check pair mapping
  2. Inspect an unrelated patch cable and infer the suspect reterminated run is correct
  3. Read port speed negotiation alone while the crossed-pair wiring pattern remains untested
  4. Re-test certified pairs after correction

Explanation

Correct Answer

D:

Pinout test detects cabling faults before IP configuration changes. The result of the remedy is checked directly: Re-test certified pairs after correction.

Incorrect Answers

A:

Confirm simple end-to-end continuity exists but never check pair mapping. Pinout test detects cabling faults before IP configuration changes. The appropriate acceptance test is: Re-test certified pairs after correction.

B:

Inspect an unrelated patch cable and infer the suspect reterminated run is correct. Pinout test detects cabling faults before IP configuration changes. The appropriate acceptance test is: Re-test certified pairs after correction.

C:

Read port speed negotiation alone while the crossed-pair wiring pattern remains untested. Pinout test detects cabling faults before IP configuration changes. The appropriate acceptance test is: Re-test certified pairs after correction.

Question 985

A security investigation requires complete bidirectional traffic with minimal SPAN loss. Which response MOST directly addresses the stated network problem or requirement?

  1. Install a properly sized network tap in authorized location
  2. Use a congested switch SPAN mirror and assume capture loss is impossible under load
  3. Put a passive network tap on one direction only when both directions are required
  4. Observe a firewall management dashboard instead of obtaining packet-level bidirectional evidence

Explanation

Correct Answer

A:

Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. A direct way to confirm the outcome is to compare tap capture continuity with interface counters.

Incorrect Answers

B:

Use a congested switch SPAN mirror and assume capture loss is impossible under load. Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. This does not implement the needed approach: install a properly sized network tap in authorized location.

C:

Put a passive network tap on one direction only when both directions are required. Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. This does not implement the needed approach: install a properly sized network tap in authorized location.

D:

Observe a firewall management dashboard instead of obtaining packet-level bidirectional evidence. Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. This does not implement the needed approach: install a properly sized network tap in authorized location.

Question 986

A security investigation requires complete bidirectional traffic with minimal SPAN loss. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Count mirrored packets without comparing drop counters or capture continuity
  2. Compare tap capture continuity with interface counters
  3. Capture one flow direction and claim all bidirectional transactions are complete
  4. Check the tap chassis is powered but never validate frame timestamps and both network directions

Explanation

Correct Answer

B:

Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. The result of the remedy is checked directly: Compare tap capture continuity with interface counters.

Incorrect Answers

A:

Count mirrored packets without comparing drop counters or capture continuity. Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. The appropriate acceptance test is: Compare tap capture continuity with interface counters.

C:

Capture one flow direction and claim all bidirectional transactions are complete. Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. The appropriate acceptance test is: Compare tap capture continuity with interface counters.

D:

Check the tap chassis is powered but never validate frame timestamps and both network directions. Hardware tap may provide capture fidelity distinct from oversubscribed SPAN. The appropriate acceptance test is: Compare tap capture continuity with interface counters.

Question 987

A data center has dead fiber but cable route is inaccessible to visual inspection. Which response MOST directly addresses the stated network problem or requirement?

  1. Inject a visual fault locator into an active laser fiber without following eye-safety procedure
  2. Diagnose a physical fiber break by changing VLAN identifiers on the switch
  3. Use visual fault locator on suitable dark fiber
  4. Use a copper cable toner on optical fiber and expect visible discontinuity evidence

Explanation

Correct Answer

C:

Visual fault locator detects near physical faults, not IP packet delay. A direct way to confirm the outcome is to locate visible light leakage/break while observing eye safety.

Incorrect Answers

A:

Inject a visual fault locator into an active laser fiber without following eye-safety procedure. Visual fault locator detects near physical faults, not IP packet delay. This does not implement the needed approach: use visual fault locator on suitable dark fiber.

B:

Diagnose a physical fiber break by changing VLAN identifiers on the switch. Visual fault locator detects near physical faults, not IP packet delay. This does not implement the needed approach: use visual fault locator on suitable dark fiber.

D:

Use a copper cable toner on optical fiber and expect visible discontinuity evidence. Visual fault locator detects near physical faults, not IP packet delay. This does not implement the needed approach: use visual fault locator on suitable dark fiber.

Question 988

A data center has dead fiber but cable route is inaccessible to visual inspection. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm the dark fiber has a patch label but never observe light leakage at the damaged section
  2. Check another healthy fiber strand and infer the inaccessible failing route has no break
  3. Inspect the optical transceiver model without conducting a safe visual fault trace
  4. Locate visible light leakage/break while observing eye safety

Explanation

Correct Answer

D:

Visual fault locator detects near physical faults, not IP packet delay. The result of the remedy is checked directly: Locate visible light leakage/break while observing eye safety.

Incorrect Answers

A:

Confirm the dark fiber has a patch label but never observe light leakage at the damaged section. Visual fault locator detects near physical faults, not IP packet delay. The appropriate acceptance test is: Locate visible light leakage/break while observing eye safety.

B:

Check another healthy fiber strand and infer the inaccessible failing route has no break. Visual fault locator detects near physical faults, not IP packet delay. The appropriate acceptance test is: Locate visible light leakage/break while observing eye safety.

C:

Inspect the optical transceiver model without conducting a safe visual fault trace. Visual fault locator detects near physical faults, not IP packet delay. The appropriate acceptance test is: Locate visible light leakage/break while observing eye safety.

Question 989

A crowded WLAN has performance issues but RSSI seems high. Which response MOST directly addresses the stated network problem or requirement?

  1. Use Wi-Fi analyzer for channel use and interference observation
  2. Increase every WLAN AP's transmit power because high RSSI always implies no interference
  3. Test ISP bandwidth without measuring local RF channel occupancy
  4. Change DNS settings while the actual problem is airtime contention or adjacent-channel interference

Explanation

Correct Answer

A:

Analyzer measures RF environment, not DHCP pool utilization. A direct way to confirm the outcome is to inspect per-channel airtime and signal distribution.

Incorrect Answers

B:

Increase every WLAN AP's transmit power because high RSSI always implies no interference. Analyzer measures RF environment, not DHCP pool utilization. This does not implement the needed approach: use Wi-Fi analyzer for channel use and interference observation.

C:

Test ISP bandwidth without measuring local RF channel occupancy. Analyzer measures RF environment, not DHCP pool utilization. This does not implement the needed approach: use Wi-Fi analyzer for channel use and interference observation.

D:

Change DNS settings while the actual problem is airtime contention or adjacent-channel interference. Analyzer measures RF environment, not DHCP pool utilization. This does not implement the needed approach: use Wi-Fi analyzer for channel use and interference observation.

Question 990

A crowded WLAN has performance issues but RSSI seems high. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Observe only RSSI and conclude a crowded WLAN has sufficient airtime
  2. Inspect per-channel airtime and signal distribution
  3. Read the SSID name and client count without checking channel busy time
  4. Confirm one user can associate outside the busy area and infer all channels are clean

Explanation

Correct Answer

B:

Analyzer measures RF environment, not DHCP pool utilization. The result of the remedy is checked directly: Inspect per-channel airtime and signal distribution.

Incorrect Answers

A:

Observe only RSSI and conclude a crowded WLAN has sufficient airtime. Analyzer measures RF environment, not DHCP pool utilization. The appropriate acceptance test is: Inspect per-channel airtime and signal distribution.

C:

Read the SSID name and client count without checking channel busy time. Analyzer measures RF environment, not DHCP pool utilization. The appropriate acceptance test is: Inspect per-channel airtime and signal distribution.

D:

Confirm one user can associate outside the busy area and infer all channels are clean. Analyzer measures RF environment, not DHCP pool utilization. The appropriate acceptance test is: Inspect per-channel airtime and signal distribution.

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