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The primary purpose of EtherChannel is to bundle multiple physical links into a single logical link. This technology allows for the aggregation of several Ethernet connections, effectively increasing the overall bandwidth and providing more efficient use of resources. By combining multiple links, EtherChannel enhances the performance and resilience of a network connection without needing to make significant changes to existing network configurations.

It also helps in load balancing traffic across these links, ensuring that no single link becomes a bottleneck while maintaining the reliability of the connection. Additionally, EtherChannel provides redundancy; if one of the physical links fails, the traffic can continue to flow through the remaining operational links in the group, thus supporting higher availability in network design.

While routing capacity, redundancy, and Quality of Service are important considerations in networking, they do not directly align with the primary function of EtherChannel, which centers on link aggregation and bandwidth enhancement.