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Last Update: Nov 14, 2026

N10-009 Training Course: 240 Video Lectures

N10-009 PDF Study Guide: 128 Pages

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CompTIA N10-009 Practice Test 35

Question 340

A network team addresses this situation: A shared tenant building allows visitors to reach unsecured core switch consoles. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Run a supervised transfer test and time supported switch operation.
  2. Measure steady and peak amp draw after rebalancing.
  3. Log humidity and dew point through load and weather changes.
  4. Attempt authorized and unauthorized entry under supervision.

Explanation

Correct Answer

D:

Access controls and recorded attempts verify physical security. Verification of this result involves attempt authorized and unauthorized entry under supervision.

Incorrect Answers

A:

Run a supervised transfer test and time supported switch operation. That check cannot demonstrate attempt authorized and unauthorized entry under supervision.

B:

Measure steady and peak amp draw after rebalancing. That check cannot demonstrate attempt authorized and unauthorized entry under supervision.

C:

Stable readings above condensation risk validate environmental control. That check cannot demonstrate attempt authorized and unauthorized entry under supervision.

Question 341

A network specialist investigates this evidence: A shared tenant building allows visitors to reach unsecured core switch consoles. Which underlying condition BEST explains the observed failure or requirement?

  1. Physical access to network infrastructure is uncontrolled.
  2. A power distribution unit does not itself provide battery backup.
  3. Humidity and dew point are outside equipment-safe limits.
  4. The outlet distribution plan is overloaded.

Explanation

Correct Answer

A:

Physical access to network infrastructure is uncontrolled. Physical custody prevents unauthorized console and cable manipulation.

Incorrect Answers

B:

A power distribution unit does not itself provide battery backup. The missing change involves physical access to network infrastructure is uncontrolled.

C:

Humidity and dew point are outside equipment-safe limits. That does not establish physical access to network infrastructure is uncontrolled.

D:

Electrical distribution must stay within safe capacity and code. That does not establish physical access to network infrastructure is uncontrolled.

Question 342

A network team observes: Two redundant routers share the same rack PDU and both fail when that single feed trips. What is the MOST appropriate corrective action or technical decision?

  1. Recalculate circuit and PDU draw, rebalance and install adequately rated feeds.
  2. Connect independent power feeds and UPS paths where available.
  3. Install a UPS with calculated watt load and required runtime.
  4. Place core devices in controlled lockable racks and rooms with visitor logs.

Explanation

Correct Answer

B:

Redundancy only survives failures when dependencies are independent. The supposedly redundant devices share one power failure domain.

Incorrect Answers

A:

Recalculating circuit and PDU draw, rebalance and installing adequately rated feeds would not connect independent power feeds and UPS paths where available.

C:

Installing a UPS with calculated watt load and required runtime would not connect independent power feeds and UPS paths where available.

D:

Placing core devices in controlled lockable racks and rooms with visitor logs would not connect independent power feeds and UPS paths where available.

Question 343

A network team addresses this situation: Two redundant routers share the same rack PDU and both fail when that single feed trips. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Measure steady and peak amp draw after rebalancing.
  2. Run a supervised transfer test and time supported switch operation.
  3. Remove one feed under test and verify both gateway service and remaining power.
  4. Log humidity and dew point through load and weather changes.

Explanation

Correct Answer

C:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves removing one feed under test and verify both gateway service and remaining power.

Incorrect Answers

A:

Measure steady and peak amp draw after rebalancing. That check cannot demonstrate an authorized inter-subnet routed path.

B:

Run a supervised transfer test and time supported switch operation. That check cannot demonstrate an authorized inter-subnet routed path.

D:

Stable readings above condensation risk validate environmental control. That check cannot demonstrate an authorized inter-subnet routed path.

Question 344

A network specialist investigates this evidence: Two redundant routers share the same rack PDU and both fail when that single feed trips. Which underlying condition BEST explains the observed failure or requirement?

  1. The outlet distribution plan is overloaded.
  2. A power distribution unit does not itself provide battery backup.
  3. Physical access to network infrastructure is uncontrolled.
  4. The supposedly redundant devices share one power failure domain.

Explanation

Correct Answer

D:

The supposedly redundant devices share one power failure domain. Redundancy only survives failures when dependencies are independent.

Incorrect Answers

A:

Electrical distribution must stay within safe capacity and code. That does not establish the supposedly redundant devices share one power failure domain.

B:

A power distribution unit does not itself provide battery backup. The missing change involves the supposedly redundant devices share one power failure domain.

C:

Physical access to network infrastructure is uncontrolled. That does not establish the supposedly redundant devices share one power failure domain.

Question 345

A network team observes: A new technician cannot determine which patch panel termination connects to wall jack 2-17 during an outage. What is the MOST appropriate corrective action or technical decision?

  1. Maintain a labeled cable map linking wall jacks, panel ports and switch interfaces.
  2. Collect running firmware versions into a maintained asset configuration inventory.
  3. Perform a predictive and post-install site survey with coverage heatmap.
  4. Update routed subnet and gateway diagrams from observed configuration.

Explanation

Correct Answer

A:

Layer 1 documentation describes physical connectivity rather than routing. Physical layer 1 cable records are incomplete.

Incorrect Answers

B:

Collecting running firmware versions into a maintained asset configuration inventory would not maintain a labeled cable map linking wall jacks, panel ports and switch interfaces.

C:

Performing a predictive and post-install site survey with coverage heatmap would not maintain a labeled cable map linking wall jacks, panel ports and switch interfaces.

D:

Updating routed subnet and gateway diagrams from observed configuration would not maintain a labeled cable map linking wall jacks, panel ports and switch interfaces.

Question 346

A network team addresses this situation: A new technician cannot determine which patch panel termination connects to wall jack 2-17 during an outage. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Measure RSSI and throughput in intended scanner locations.
  2. Trace jack 2-17 with a toner and compare it to the maintained map.
  3. Inspect the ticket and test the rollback procedure in a safe environment.
  4. Compare a sampled route table and subnet to the approved diagram.

Explanation

Correct Answer

B:

A correct trace validates the cable inventory.

Incorrect Answers

A:

Measure RSSI and throughput in intended scanner locations. That check cannot demonstrate trace jack 2-17 with a toner and compare it to the maintained map.

C:

Approved scope and rollback evidence validate change governance. That check cannot demonstrate trace jack 2-17 with a toner and compare it to the maintained map.

D:

IP routing depends on a route to the destination prefix and a reachable next hop. That check cannot demonstrate trace jack 2-17 with a toner and compare it to the maintained map.

Question 347

A network team observes: A remote office loses routing after migration because engineers use an old diagram with obsolete network prefixes. What is the MOST appropriate corrective action or technical decision?

  1. Maintain network hardware ownership, EOS dates and approved replacement plans.
  2. Use a change request with dependency review, approval, backout and communication.
  3. Update routed subnet and gateway diagrams from observed configuration.
  4. Revoke certificates, sanitize storage and document custody before disposal.

Explanation

Correct Answer

C:

Layer 3 diagrams capture IP networks and routing dependencies.

Incorrect Answers

A:

Maintaining network hardware ownership, EOS dates and approved replacement plans would not update routed subnet and gateway diagrams from observed configuration.

B:

Using a change request with dependency review, approval, backout and communication would not update routed subnet and gateway diagrams from observed configuration.

D:

Revoking certificates, sanitize storage and documenting custody would not update routed subnet and gateway diagrams from observed configuration.

Question 348

A network team addresses this situation: A remote office loses routing after migration because engineers use an old diagram with obsolete network prefixes. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Verify certificate revocation and asset-level disposal evidence.
  2. Inspect the ticket and test the rollback procedure in a safe environment.
  3. Compare device version output against the inventory for representative branches.
  4. Compare a sampled route table and subnet to the approved diagram.

Explanation

Correct Answer

D:

IP routing depends on a route to the destination prefix and a reachable next hop. Verification of this result involves comparing a sampled route table and subnet to the approved diagram.

Incorrect Answers

A:

Access loss and documented disposition validate retirement. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

B:

Approved scope and rollback evidence validate change governance. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

C:

Compare device version output against the inventory for representative branches. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

Question 349

A network specialist investigates this evidence: A remote office loses routing after migration because engineers use an old diagram with obsolete network prefixes. Which underlying condition BEST explains the observed failure or requirement?

  1. The logical Layer 3 diagram is outdated.
  2. Device retirement omitted secure media and credential handling.
  3. Network software version and support records are missing.
  4. Asset inventory does not track owner and vendor support lifecycle.

Explanation

Correct Answer

A:

The logical Layer 3 diagram is outdated. Layer 3 diagrams capture IP networks and routing dependencies.

Incorrect Answers

B:

Layer 3 diagrams capture IP networks and routing dependencies. That does not establish the logical Layer 3 diagram is outdated.

C:

Network software version and support records are missing. That does not establish the logical Layer 3 diagram is outdated.

D:

Asset inventory does not track owner and vendor support lifecycle.

Question 350

A network team observes: A replacement switch is ordered without checking occupied rack units and incompatible rail depth. What is the MOST appropriate corrective action or technical decision?

  1. Maintain network hardware ownership, EOS dates and approved replacement plans.
  2. Record unit positions, rack depth and mounting constraints before purchase.
  3. Use a change request with dependency review, approval, backout and communication.
  4. Update routed subnet and gateway diagrams from observed configuration.

Explanation

Correct Answer

B:

The rack elevation and hardware dimensions were never captured.

Incorrect Answers

A:

Maintaining network hardware ownership, EOS dates and approved replacement plans would not record unit positions, rack depth and mounting constraints.

C:

Using a change request with dependency review, approval, backout and communication would not record unit positions, rack depth and mounting constraints.

D:

Updating routed subnet and gateway diagrams from observed configuration would not record unit positions, rack depth and mounting constraints.


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