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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 81

Question 800

One interface shows FCS/CRC errors increasing during traffic peaks. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Inspect interface speed only while CRC counters keep incrementing under load
  2. Run the cable swap on an unaffected port instead of the erroring interface
  3. Check a single idle-second snapshot without comparing before/after CRC growth
  4. Compare CRC/error counts with a known-good cable swap

Explanation

Correct Answer

D:

CRC errors reveal frame corruption; TCP retransmissions are a consequence. The result of the remedy is checked directly: Compare CRC/error counts with a known-good cable swap.

Incorrect Answers

A:

Inspect interface speed only while CRC counters keep incrementing under load. CRC errors reveal frame corruption; TCP retransmissions are a consequence. The appropriate acceptance test is: Compare CRC/error counts with a known-good cable swap.

B:

Run the cable swap on an unaffected port instead of the erroring interface. CRC errors reveal frame corruption; TCP retransmissions are a consequence. The appropriate acceptance test is: Compare CRC/error counts with a known-good cable swap.

C:

Check a single idle-second snapshot without comparing before/after CRC growth. CRC errors reveal frame corruption; TCP retransmissions are a consequence. The appropriate acceptance test is: Compare CRC/error counts with a known-good cable swap.

Question 801

A switch receives undersized Ethernet frames with errors. Which response MOST directly addresses the stated network problem or requirement?

  1. Diagnose runts from collision/PHY or malformed sender conditions
  2. Treat undersized errored Ethernet runts as an application DNS failure
  3. Disable link error logging instead of examining malformed frames or duplex/PHY conditions
  4. Enlarge TCP receive windows to compensate for frames below minimum Ethernet size

Explanation

Correct Answer

A:

Runts are undersized frames, not jumbo-MTU drops. A direct way to confirm the outcome is to inspect runt counters with duplex/physical error trend.

Incorrect Answers

B:

Treat undersized errored Ethernet runts as an application DNS failure. Runts are undersized frames, not jumbo-MTU drops. This does not implement the needed approach: diagnose runts from collision/PHY or malformed sender conditions.

C:

Disable link error logging instead of examining malformed frames or duplex/PHY conditions. Runts are undersized frames, not jumbo-MTU drops. This does not implement the needed approach: diagnose runts from collision/PHY or malformed sender conditions.

D:

Enlarge TCP receive windows to compensate for frames below minimum Ethernet size. Runts are undersized frames, not jumbo-MTU drops. This does not implement the needed approach: diagnose runts from collision/PHY or malformed sender conditions.

Question 802

A switch receives undersized Ethernet frames with errors. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Verify IP address configuration but not switch runt and physical error counters
  2. Inspect runt counters with duplex/physical error trend
  3. Check average link utilization without correlating undersize frames to collision or PHY symptoms
  4. Inspect a healthy neighboring switchport while the affected port still receives runts

Explanation

Correct Answer

B:

Runts are undersized frames, not jumbo-MTU drops. The result of the remedy is checked directly: Inspect runt counters with duplex/physical error trend.

Incorrect Answers

A:

Verify IP address configuration but not switch runt and physical error counters. Runts are undersized frames, not jumbo-MTU drops. The appropriate acceptance test is: Inspect runt counters with duplex/physical error trend.

C:

Check average link utilization without correlating undersize frames to collision or PHY symptoms. Runts are undersized frames, not jumbo-MTU drops. The appropriate acceptance test is: Inspect runt counters with duplex/physical error trend.

D:

Inspect a healthy neighboring switchport while the affected port still receives runts. Runts are undersized frames, not jumbo-MTU drops. The appropriate acceptance test is: Inspect runt counters with duplex/physical error trend.

Question 803

A network interface reports giant frames only on one storage uplink. Which response MOST directly addresses the stated network problem or requirement?

  1. Force jumbo frames through an end-to-end path that has smaller MTU settings
  2. Change the DNS suffix to resolve giant-frame receive counters
  3. Check MTU and jumbo-frame support across path
  4. Disable giant counters and claim oversized storage frames no longer occur

Explanation

Correct Answer

C:

Giants indicate oversize relative to accepted frame length. A direct way to confirm the outcome is to send increasing-sized test frames and inspect giant counter.

Incorrect Answers

A:

Force jumbo frames through an end-to-end path that has smaller MTU settings. Giants indicate oversize relative to accepted frame length. This does not implement the needed approach: check MTU and jumbo-frame support across path.

B:

Change the DNS suffix to resolve giant-frame receive counters. Giants indicate oversize relative to accepted frame length. This does not implement the needed approach: check MTU and jumbo-frame support across path.

D:

Disable giant counters and claim oversized storage frames no longer occur. Giants indicate oversize relative to accepted frame length. This does not implement the needed approach: check MTU and jumbo-frame support across path.

Question 804

A network interface reports giant frames only on one storage uplink. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Measure only standard 1500-byte frame success without exercising larger storage frames
  2. Check configured interface MTU at one end while intermediate path MTUs remain unknown
  3. Read port speed negotiation as proof the giant-frame issue has been resolved
  4. Send increasing-sized test frames and inspect giant counter

Explanation

Correct Answer

D:

Giants indicate oversize relative to accepted frame length. The result of the remedy is checked directly: Send increasing-sized test frames and inspect giant counter.

Incorrect Answers

A:

Measure only standard 1500-byte frame success without exercising larger storage frames. Giants indicate oversize relative to accepted frame length. The appropriate acceptance test is: Send increasing-sized test frames and inspect giant counter.

B:

Check configured interface MTU at one end while intermediate path MTUs remain unknown. Giants indicate oversize relative to accepted frame length. The appropriate acceptance test is: Send increasing-sized test frames and inspect giant counter.

C:

Read port speed negotiation as proof the giant-frame issue has been resolved. Giants indicate oversize relative to accepted frame length. The appropriate acceptance test is: Send increasing-sized test frames and inspect giant counter.

Question 805

A port shows rising drops but no CRC errors during peak load. Which response MOST directly addresses the stated network problem or requirement?

  1. Check queue congestion or output-buffer limits
  2. Replace the copper cable based only on packet drops while CRC remains healthy
  3. Increase DNS query cache and ignore peak egress buffer congestion
  4. Disable QoS output queue telemetry to conceal packet discards

Explanation

Correct Answer

A:

Congestion drops need not indicate cable damage. A direct way to confirm the outcome is to correlate drops with utilization and QoS queue occupancy.

Incorrect Answers

B:

Replace the copper cable based only on packet drops while CRC remains healthy. Congestion drops need not indicate cable damage. This does not implement the needed approach: check queue congestion or output-buffer limits.

C:

Increase DNS query cache and ignore peak egress buffer congestion. Congestion drops need not indicate cable damage. This does not implement the needed approach: check queue congestion or output-buffer limits.

D:

Disable QoS output queue telemetry to conceal packet discards. Congestion drops need not indicate cable damage. This does not implement the needed approach: check queue congestion or output-buffer limits.

Question 806

A port shows rising drops but no CRC errors during peak load. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Check physical error counters alone while output drops increase at load peaks
  2. Correlate drops with utilization and QoS queue occupancy
  3. Observe interface speed but never compare queue occupancy and congestion intervals
  4. Run a test during an idle window and infer the busy-period buffer problem is absent

Explanation

Correct Answer

B:

Congestion drops need not indicate cable damage. The result of the remedy is checked directly: Correlate drops with utilization and QoS queue occupancy.

Incorrect Answers

A:

Check physical error counters alone while output drops increase at load peaks. Congestion drops need not indicate cable damage. The appropriate acceptance test is: Correlate drops with utilization and QoS queue occupancy.

C:

Observe interface speed but never compare queue occupancy and congestion intervals. Congestion drops need not indicate cable damage. The appropriate acceptance test is: Correlate drops with utilization and QoS queue occupancy.

D:

Run a test during an idle window and infer the busy-period buffer problem is absent. Congestion drops need not indicate cable damage. The appropriate acceptance test is: Correlate drops with utilization and QoS queue occupancy.

Question 807

A switch port remains administratively down after cabling repair. Which response MOST directly addresses the stated network problem or requirement?

  1. Replace every cable again even though the port is administratively shut down
  2. Modify the host's default gateway while the switchport remains disabled by configuration
  3. Apply approved no-shutdown action after verifying intended change
  4. Bypass change authorization and enable unrelated protected ports along with the target

Explanation

Correct Answer

C:

Administrative disablement cannot be fixed by changing cables alone. A direct way to confirm the outcome is to inspect administrative versus operational interface state.

Incorrect Answers

A:

Replace every cable again even though the port is administratively shut down. Administrative disablement cannot be fixed by changing cables alone. This does not implement the needed approach: apply approved no-shutdown action after verifying intended change.

B:

Modify the host's default gateway while the switchport remains disabled by configuration. Administrative disablement cannot be fixed by changing cables alone. This does not implement the needed approach: apply approved no-shutdown action after verifying intended change.

D:

Bypass change authorization and enable unrelated protected ports along with the target. Administrative disablement cannot be fixed by changing cables alone. This does not implement the needed approach: apply approved no-shutdown action after verifying intended change.

Question 808

A switch port remains administratively down after cabling repair. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm cabling continuity and infer the administratively Down switchport now forwards frames
  2. Read only operational link status without comparing the administrative shutdown setting
  3. Test another active access port instead of the intended disabled interface
  4. Inspect administrative versus operational interface state

Explanation

Correct Answer

D:

Administrative disablement cannot be fixed by changing cables alone. The result of the remedy is checked directly: Inspect administrative versus operational interface state.

Incorrect Answers

A:

Confirm cabling continuity and infer the administratively Down switchport now forwards frames. Administrative disablement cannot be fixed by changing cables alone. The appropriate acceptance test is: Inspect administrative versus operational interface state.

B:

Read only operational link status without comparing the administrative shutdown setting. Administrative disablement cannot be fixed by changing cables alone. The appropriate acceptance test is: Inspect administrative versus operational interface state.

C:

Test another active access port instead of the intended disabled interface. Administrative disablement cannot be fixed by changing cables alone. The appropriate acceptance test is: Inspect administrative versus operational interface state.

Question 809

A device port is error-disabled after a detected BPDU violation. Which response MOST directly addresses the stated network problem or requirement?

  1. Investigate protection trigger before authorized recovery
  2. Disable BPDU guard across the whole switch to recover one error-disabled edge port
  3. Re-enable the port repeatedly without determining why bridge BPDUs appeared
  4. Treat the port's errdisable state as a DHCP lease error and change client DNS settings

Explanation

Correct Answer

A:

Recovery without root-cause correction risks repeated disablement. A direct way to confirm the outcome is to inspect errdisable cause and edge port BPDU logs.

Incorrect Answers

B:

Disable BPDU guard across the whole switch to recover one error-disabled edge port. Recovery without root-cause correction risks repeated disablement. This does not implement the needed approach: investigate protection trigger before authorized recovery.

C:

Re-enable the port repeatedly without determining why bridge BPDUs appeared. Recovery without root-cause correction risks repeated disablement. This does not implement the needed approach: investigate protection trigger before authorized recovery.

D:

Treat the port's errdisable state as a DHCP lease error and change client DNS settings. Recovery without root-cause correction risks repeated disablement. This does not implement the needed approach: investigate protection trigger before authorized recovery.

Question 810

A device port is error-disabled after a detected BPDU violation. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Show the port was administratively reenabled without inspecting its BPDU violation reason
  2. Inspect errdisable cause and edge port BPDU logs
  3. Test connectivity once while the same prohibited switch is still connected downstream
  4. Read generic interface drops without correlating the BPDU and errdisable event log

Explanation

Correct Answer

B:

Recovery without root-cause correction risks repeated disablement. The result of the remedy is checked directly: Inspect errdisable cause and edge port BPDU logs.

Incorrect Answers

A:

Show the port was administratively reenabled without inspecting its BPDU violation reason. Recovery without root-cause correction risks repeated disablement. The appropriate acceptance test is: Inspect errdisable cause and edge port BPDU logs.

C:

Test connectivity once while the same prohibited switch is still connected downstream. Recovery without root-cause correction risks repeated disablement. The appropriate acceptance test is: Inspect errdisable cause and edge port BPDU logs.

D:

Read generic interface drops without correlating the BPDU and errdisable event log. Recovery without root-cause correction risks repeated disablement. The appropriate acceptance test is: Inspect errdisable cause and edge port BPDU logs.

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