N10-009 Exam Dumps | A company is expanding to another floor in the same building. The network engineer configures a new switch

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CompTIA.N10-009.v2025-11-21.q147
Question 72

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Question 72/147

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?

A. The new switch has unused ports disabled

B. The new switch does not have a default gateway

C. The new switch is connected to an access port

D. The new switch is in a spanning tree loop

Correct Answer: D

This describes aSpanning Tree Protocol (STP) loop. If STP isn't correctly configured or a redundant link is added without STP protection, it causesbroadcast storms and network outages.
* A. Unused ports disabledwould not affect the entire network.
* B. Missing default gatewayon a switch doesn't cause total network loss.
* **C. Connecting a switch to an access port can cause VLAN mismatches, but not total connectivity loss unless a loop forms.
#Reference:
CompTIA Network+ N10-009 Official Objectives: 3.6 - Explain the characteristics of network topologies and types.

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