Redundant networks require the addition of physical paths, but logical redundancy must also be part of the design. Redundancy is an important part of the hierarchical design for eliminating single points of failure and preventing disruption of network services to users. This topic covers the causes of loops in a Layer 2 network and briefly explains how spanning tree protocol works. Packet Tracer – Investigate STP Loop Prevention.Redundancy in Layer 2 Switched Networks.