Multipathing is the best method to achieve network redundancy by providing multiple physical and logical paths to transmit and receive data. This way, if one path fails, another one can take over, thus maintaining network availability. NIC teaming is a method used to increase network throughput and redundancy at the server level by combining multiple network interface cards, but it does not address redundancy in paths through the network infrastructure. Power redundancy is essential for ensuring devices remain powered during an outage but does not provide data path redundancy. QoS improves the network performance for critical operations but does not provide multiple paths for redundancy.