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N10-009 · Question #367

A company is expanding to another floor in the same building. The network engineer configures a new switch with the same VLANs as the existing stack. When the network engineer connects the new…

The correct answer is D. The new switch is in a spanning tree loop. This describes a Spanning Tree Protocol (STP) loop. If STP isn't correctly configured or a redundant link is added without STP protection, it causes broadcast storms and network outages.

Submitted by eva_at· Mar 6, 2026Network Troubleshooting

Question

A company is expanding to another floor in the same building. The network engineer configures a new switch with the same VLANs as the existing stack. When the network engineer connects the new switch to the existing stack, all users lose connectivity. Which of the following is the MOST likely reason?

Options

  • AThe new switch has unused ports disabled
  • BThe new switch does not have a default gateway
  • CThe new switch is connected to an access port
  • DThe new switch is in a spanning tree loop

How the community answered

(31 responses)
  • A
    13% (4)
  • B
    3% (1)
  • C
    10% (3)
  • D
    74% (23)

Explanation

This describes a Spanning Tree Protocol (STP) loop. If STP isn't correctly configured or a redundant link is added without STP protection, it causes broadcast storms and network outages.

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