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The primary role of the access layer in a network is to enable user aggregation. This layer serves as the point of entry for end devices, such as computers, printers, and other endpoint devices. It is responsible for providing access to the network for these users, ensuring that they can connect to the resources they need, such as servers and applications.

The access layer typically includes network devices like switches that manage the connections and traffic coming from various user endpoints. By aggregating multiple user connections, the access layer effectively simplifies network management and enhances overall performance. It facilitates features such as VLAN segmentation, which allows for better security and bandwidth utilization.

While other functions noted in the options have their respective roles in network architecture, they do not align with the specific role of the access layer. For instance, interconnecting multiple buildings relates more to the distribution layer, connecting to an internet gateway typically involves core functions, and managing traffic routing is primarily handled by routers at various levels beyond the access layer. Thus, user aggregation is the most accurate description of the access layer's main function.