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NET+ N10-009 V9 Network troubleshooting Runs in your browser · no setup Preview · not independently reviewed

Diagnose a floor-wide outage

Use symptoms and test results to isolate a switching-loop incident.

Estimated10 min
DifficultyIntermediate
Points8
Scenario brief

Users across the third floor report intermittent connectivity immediately after a small unmanaged switch was installed in a conference room. The distribution router and ISP circuit are healthy.

Content record

Preview · not independently reviewed

Mapped to CompTIA N10-009 objectives · Internal validation 2026-08-12 · Available as preview practice, but a named independent subject-matter expert has not yet verified the question and answer key.

Community review →
5.3Given a scenario, troubleshoot common issues with network services. 5.1Explain the troubleshooting methodology.
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Method: Mapped to N10-009 switching-loop and troubleshooting-methodology objectives; mitigations reviewed.

Current-profile check: 2026-08-12 · Next review due 2027-02-08

01

Inspect the evidence

Use only the information provided to complete the tasks.

NOC observations

list
  • ›Access-switch CPU: 98%
  • ›MAC addresses rapidly alternate between Gi0/19 and Gi0/20
  • ›Broadcast traffic increased from 2% to 91%
  • ›No recent change to DHCP scope utilization

Conference room cabling

code
Wall jack A ── unmanaged switch port 1
Wall jack B ── unmanaged switch port 2
Laptop      ── unmanaged switch port 3
02

Complete the response

Partial credit is available for matching, ordering, and multi-select tasks.

01
single choice

What is the most likely root cause?

2 pts
Need a hint?

Restate the exact outcome or failure the prompt asks about before comparing choices.

Show another hint

Eliminate choices that solve a nearby problem, change more than requested, or do not fit the evidence.

02
ordering

Order the response using a structured troubleshooting process.

4 pts

Drag the rows or use the arrow buttons to reorder.

  1. 1 Verify full connectivity and document the fix
  2. 2 Disconnect one conference-room uplink to test the theory
  3. 3 Form a theory that redundant unmanaged links created a loop
  4. 4 Identify symptoms and recent changes
Need a hint?

Identify the prerequisite that must happen first and the verification or documentation that belongs last.

Show another hint

For the middle steps, ask what must already be true before each action can safely happen.

03
multi select

Select the TWO switch protections that best limit a recurrence.

2 pts
Need a hint?

Evaluate each option independently against the scenario evidence instead of treating the list as one decision.

Show another hint

Choose only options that directly satisfy the prompt; being generally true is not enough.

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