Final answer:
Node Splitting is employed to reduce traffic congestion on an HFC network.
Step-by-step explanation:
The method employed to reduce traffic congestion on an HFC (Hybrid Fiber-Coaxial) network is Node Splitting. Node splitting involves dividing a single large node into smaller nodes to reduce the number of households or subscribers sharing the same network segment. This helps in distributing the network load more evenly and reducing congestion.