A network manager connects two switches together and uses two connecting links. Which of the following configurations will prevent Layer 2 loops?

The correct answer is C. Link aggregation. Link aggregation (e.g., LACP – Link Aggregation Control Protocol) combines multiple physical links into a single logical link. This prevents Layer 2 loops by treating the aggregated links as one logical connection, ensuring loop-free redundancy and increased bandwidth. 802.1Q…

Submitted by brentm· Mar 6, 2026Network Implementation

Question

Options

A802.1Q tagging
BFull duplex
CLink aggregation
DQoS

How the community answered

(31 responses)

B
6% (2)
C
90% (28)
D
3% (1)

Explanation

Link aggregation (e.g., LACP – Link Aggregation Control Protocol) combines multiple physical links into a single logical link. This prevents Layer 2 loops by treating the aggregated links as one logical connection, ensuring loop-free redundancy and increased bandwidth. 802.1Q tagging is for VLAN identification, not loop prevention. Full duplex affects data transmission mode, not topology loops. QoS (Quality of Service) prioritizes traffic types but does not address Layer 2 loops. Link aggregation is the correct configuration to prevent Layer 2 loops when using multiple connections between switches.

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