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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 51

Question 500

A baseline host inventory is stale after multiple unannounced installations. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Count devices in the stale inventory without conducting current segment discovery
  2. Ping a known switch but not compare new MAC and neighbor records
  3. Read DHCP pool size and assume it reveals every newly installed network device
  4. Compare current neighbors, ARP and device identities to inventory

Explanation

Correct Answer

D:

Discovery is point-in-time observation, not guaranteed ownership truth. The result of the remedy is checked directly: Compare current neighbors, ARP and device identities to inventory.

Incorrect Answers

A:

Count devices in the stale inventory without conducting current segment discovery. Discovery is point-in-time observation, not guaranteed ownership truth. The appropriate acceptance test is: Compare current neighbors, ARP and device identities to inventory.

B:

Ping a known switch but not compare new MAC and neighbor records. Discovery is point-in-time observation, not guaranteed ownership truth. The appropriate acceptance test is: Compare current neighbors, ARP and device identities to inventory.

C:

Read DHCP pool size and assume it reveals every newly installed network device. Discovery is point-in-time observation, not guaranteed ownership truth. The appropriate acceptance test is: Compare current neighbors, ARP and device identities to inventory.

Question 501

An incident team needs one-time investigation of an unknown device. Which response MOST directly addresses the stated network problem or requirement?

  1. Perform targeted ad hoc discovery limited to affected segment
  2. Scan every external public address range instead of the authorized affected segment
  3. Assume an unknown endpoint's hostname identifies its physical switch port
  4. Disable access security policies to allow ad-hoc investigation of a single device

Explanation

Correct Answer

A:

Targeted discovery reduces needless scanning during urgent triage. A direct way to confirm the outcome is to validate discovered MAC and interface location on switches.

Incorrect Answers

B:

Scan every external public address range instead of the authorized affected segment. Targeted discovery reduces needless scanning during urgent triage. This does not implement the needed approach: perform targeted ad hoc discovery limited to affected segment.

C:

Assume an unknown endpoint's hostname identifies its physical switch port. Targeted discovery reduces needless scanning during urgent triage. This does not implement the needed approach: perform targeted ad hoc discovery limited to affected segment.

D:

Disable access security policies to allow ad-hoc investigation of a single device. Targeted discovery reduces needless scanning during urgent triage. This does not implement the needed approach: perform targeted ad hoc discovery limited to affected segment.

Question 502

An incident team needs one-time investigation of an unknown device. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Observe one new IP response but never validate its MAC and current interface attachment
  2. Validate discovered MAC and interface location on switches
  3. Check a switch management IP rather than trace the suspicious endpoint's neighbor record
  4. Run broad inventory discovery without correlating the actual unknown device in the incident segment

Explanation

Correct Answer

B:

Targeted discovery reduces needless scanning during urgent triage. The result of the remedy is checked directly: Validate discovered MAC and interface location on switches.

Incorrect Answers

A:

Observe one new IP response but never validate its MAC and current interface attachment. Targeted discovery reduces needless scanning during urgent triage. The appropriate acceptance test is: Validate discovered MAC and interface location on switches.

C:

Check a switch management IP rather than trace the suspicious endpoint's neighbor record. Targeted discovery reduces needless scanning during urgent triage. The appropriate acceptance test is: Validate discovered MAC and interface location on switches.

D:

Run broad inventory discovery without correlating the actual unknown device in the incident segment. Targeted discovery reduces needless scanning during urgent triage. The appropriate acceptance test is: Validate discovered MAC and interface location on switches.

Question 503

A cloud app's API latency spikes while host interfaces are normal. Which response MOST directly addresses the stated network problem or requirement?

  1. Diagnose a cloud application's latency using only NIC interface speed advertisements
  2. Increase DNS cache size while end-user API response times spike independent of host traffic
  3. Monitor service response times along with network metrics
  4. Turn off application tracing and assume normal network RTT proves application performance

Explanation

Correct Answer

C:

Network monitoring alone cannot identify application processing delay. A direct way to confirm the outcome is to compare application latency and network RTT across same periods.

Incorrect Answers

A:

Diagnose a cloud application's latency using only NIC interface speed advertisements. Network monitoring alone cannot identify application processing delay. This does not implement the needed approach: monitor service response times along with network metrics.

B:

Increase DNS cache size while end-user API response times spike independent of host traffic. Network monitoring alone cannot identify application processing delay. This does not implement the needed approach: monitor service response times along with network metrics.

D:

Turn off application tracing and assume normal network RTT proves application performance. Network monitoring alone cannot identify application processing delay. This does not implement the needed approach: monitor service response times along with network metrics.

Question 504

A cloud app's API latency spikes while host interfaces are normal. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Report low network RTT alone as proof the cloud API never stalls
  2. Check server CPU utilization without measuring request response times
  3. Compare latency charts from different days rather than correlate app spikes and network measurements
  4. Compare application latency and network RTT across same periods

Explanation

Correct Answer

D:

Network monitoring alone cannot identify application processing delay. The result of the remedy is checked directly: Compare application latency and network RTT across same periods.

Incorrect Answers

A:

Report low network RTT alone as proof the cloud API never stalls. Network monitoring alone cannot identify application processing delay. The appropriate acceptance test is: Compare application latency and network RTT across same periods.

B:

Check server CPU utilization without measuring request response times. Network monitoring alone cannot identify application processing delay. The appropriate acceptance test is: Compare application latency and network RTT across same periods.

C:

Compare latency charts from different days rather than correlate app spikes and network measurements. Network monitoring alone cannot identify application processing delay. The appropriate acceptance test is: Compare application latency and network RTT across same periods.

Question 505

A core uplink may fail outside business hours without any user reports. Which response MOST directly addresses the stated network problem or requirement?

  1. Add synthetic availability tests and paging escalation
  2. Wait for a user complaint before discovering an overnight core-uplink failure
  3. Configure alert paging only during normal office hours despite off-hours risk
  4. Monitor merely the router's system hostname while the actual uplink may fail

Explanation

Correct Answer

A:

Availability monitoring tests reachability, not utilization alone. A direct way to confirm the outcome is to disable test target in maintenance and observe alert timing.

Incorrect Answers

B:

Wait for a user complaint before discovering an overnight core-uplink failure. Availability monitoring tests reachability, not utilization alone. This does not implement the needed approach: add synthetic availability tests and paging escalation.

C:

Configure alert paging only during normal office hours despite off-hours risk. Availability monitoring tests reachability, not utilization alone. This does not implement the needed approach: add synthetic availability tests and paging escalation.

D:

Monitor merely the router's system hostname while the actual uplink may fail. Availability monitoring tests reachability, not utilization alone. This does not implement the needed approach: add synthetic availability tests and paging escalation.

Question 506

A core uplink may fail outside business hours without any user reports. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm the monitoring software runs but never fail the synthetic test target
  2. Disable test target in maintenance and observe alert timing
  3. Check link Up during office hours and infer after-hours alert timing
  4. Inspect the paging contact list without validating the notification reaches responders on a controlled outage

Explanation

Correct Answer

B:

Availability monitoring tests reachability, not utilization alone. The result of the remedy is checked directly: Disable test target in maintenance and observe alert timing.

Incorrect Answers

A:

Confirm the monitoring software runs but never fail the synthetic test target. Availability monitoring tests reachability, not utilization alone. The appropriate acceptance test is: Disable test target in maintenance and observe alert timing.

C:

Check link Up during office hours and infer after-hours alert timing. Availability monitoring tests reachability, not utilization alone. The appropriate acceptance test is: Disable test target in maintenance and observe alert timing.

D:

Inspect the paging contact list without validating the notification reaches responders on a controlled outage. Availability monitoring tests reachability, not utilization alone. The appropriate acceptance test is: Disable test target in maintenance and observe alert timing.

Question 507

A router's configuration drifts from the intended secure baseline. Which response MOST directly addresses the stated network problem or requirement?

  1. Permit silent unauthorized router changes with no configuration deviation reporting
  2. Replace baseline comparison with a weekly DNS lookup of device names
  3. Schedule read-only configuration comparison and deviation notification
  4. Update the golden config to match every drift automatically before any review

Explanation

Correct Answer

C:

Configuration monitoring detects policy divergence distinct from packet loss. A direct way to confirm the outcome is to make controlled change and verify drift alert plus approved exception handling.

Incorrect Answers

A:

Permit silent unauthorized router changes with no configuration deviation reporting. Configuration monitoring detects policy divergence distinct from packet loss. This does not implement the needed approach: schedule read-only configuration comparison and deviation notification.

B:

Replace baseline comparison with a weekly DNS lookup of device names. Configuration monitoring detects policy divergence distinct from packet loss. This does not implement the needed approach: schedule read-only configuration comparison and deviation notification.

D:

Update the golden config to match every drift automatically before any review. Configuration monitoring detects policy divergence distinct from packet loss. This does not implement the needed approach: schedule read-only configuration comparison and deviation notification.

Question 508

A router's configuration drifts from the intended secure baseline. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Observe the monitoring agent service runs but never inject a controlled config deviation
  2. Check repository commit history without reading live running config differences
  3. See one permitted exception but never test whether an unapproved drift generates an alert
  4. Make controlled change and verify drift alert plus approved exception handling

Explanation

Correct Answer

D:

Configuration monitoring detects policy divergence distinct from packet loss. The result of the remedy is checked directly: Make controlled change and verify drift alert plus approved exception handling.

Incorrect Answers

A:

Observe the monitoring agent service runs but never inject a controlled config deviation. Configuration monitoring detects policy divergence distinct from packet loss. The appropriate acceptance test is: Make controlled change and verify drift alert plus approved exception handling.

B:

Check repository commit history without reading live running config differences. Configuration monitoring detects policy divergence distinct from packet loss. The appropriate acceptance test is: Make controlled change and verify drift alert plus approved exception handling.

C:

See one permitted exception but never test whether an unapproved drift generates an alert. Configuration monitoring detects policy divergence distinct from packet loss. The appropriate acceptance test is: Make controlled change and verify drift alert plus approved exception handling.

Question 509

A team cannot determine if a flow export is one-way due to sampler placement. Which response MOST directly addresses the stated network problem or requirement?

  1. Validate exporter location, sampling and ingress/egress coverage
  2. Place a flow exporter on only one return interface and assume bidirectional visibility
  3. Combine sampled ingress and egress counts without recording the exporter direction or rate
  4. Disable interface direction fields to simplify the flow monitoring dashboard

Explanation

Correct Answer

A:

Flow visibility depends on where and how traffic is observed. A direct way to confirm the outcome is to generate known bidirectional flows and compare exported record directions.

Incorrect Answers

B:

Place a flow exporter on only one return interface and assume bidirectional visibility. Flow visibility depends on where and how traffic is observed. This does not implement the needed approach: validate exporter location, sampling and ingress/egress coverage.

C:

Combine sampled ingress and egress counts without recording the exporter direction or rate. Flow visibility depends on where and how traffic is observed. This does not implement the needed approach: validate exporter location, sampling and ingress/egress coverage.

D:

Disable interface direction fields to simplify the flow monitoring dashboard. Flow visibility depends on where and how traffic is observed. This does not implement the needed approach: validate exporter location, sampling and ingress/egress coverage.

Question 510

A team cannot determine if a flow export is one-way due to sampler placement. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Verify exporter packets arrive but never generate traffic in both directions
  2. Generate known bidirectional flows and compare exported record directions
  3. Count total flow records without determining which side of the transaction they represent
  4. Test traffic only through one link while claiming coverage for a separate unmonitored egress

Explanation

Correct Answer

B:

Flow visibility depends on where and how traffic is observed. The result of the remedy is checked directly: Generate known bidirectional flows and compare exported record directions.

Incorrect Answers

A:

Verify exporter packets arrive but never generate traffic in both directions. Flow visibility depends on where and how traffic is observed. The appropriate acceptance test is: Generate known bidirectional flows and compare exported record directions.

C:

Count total flow records without determining which side of the transaction they represent. Flow visibility depends on where and how traffic is observed. The appropriate acceptance test is: Generate known bidirectional flows and compare exported record directions.

D:

Test traffic only through one link while claiming coverage for a separate unmonitored egress. Flow visibility depends on where and how traffic is observed. The appropriate acceptance test is: Generate known bidirectional flows and compare exported record directions.

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