What is one of the main functions of an Ethernet Virtual Connection (EVC)?

One of the main functions of an Ethernet Virtual Connection (EVC) is to provide traffic isolation. EVCs allow service providers to separate traffic from different customers or applications over the same physical infrastructure, effectively creating isolated virtual connections. This isolation is vital for ensuring that the performance and security of one customer's traffic do not interfere with another's, particularly in shared networks.

By employing EVCs, operators can ensure that bandwidth is allocated efficiently and that different types of traffic can be managed according to specific Quality of Service (QoS) policies. This enhances the overall performance and reliability of the Ethernet service offerings.

While other options touch on networking concepts, they do not capture the primary function of EVCs as clearly as traffic isolation does. IP routing, for example, is related to how packets are directed across different networks rather than the functionality of EVCs. Higher latency usually indicates a performance issue, and limiting network expansion does not reflect the flexible architecture that EVCs are designed to support.