N10-009 Question #284: Real Exam Question with Answer & Explanation

The correct answer is A: Spanning tree. To prevent network loops when switches are installed in parallel for redundancy, Spanning Tree Protocol (STP) should be configured to logically block redundant paths while maintaining physical connectivity.

Submitted by thandi_sa· Mar 6, 2026Network Implementation

Question

A network administrator is installing a network for a small company. The switches will be installed in parallel to provide redundancy in case a specific device fails. Which of the following should be configured to prevent loops?

Options

ASpanning tree
BCRC
CJumbo frames
DLink aggregation

Explanation

To prevent network loops when switches are installed in parallel for redundancy, Spanning Tree Protocol (STP) should be configured to logically block redundant paths while maintaining physical connectivity.

Common mistakes.

B. CRC (Cyclic Redundancy Check) is an error-detection code used to verify data integrity, not to prevent network loops.
C. Jumbo frames are larger-than-standard Ethernet frames designed to improve network throughput, but they do not address the issue of network loops.
D. Link aggregation (LACP/EtherChannel) combines multiple physical links into a single logical one for increased bandwidth and redundancy, but without STP, multiple aggregated links could still form a loop if not managed properly.

Concept tested. Spanning Tree Protocol for loop prevention

Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html

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