An extranet linking a large firm to its suppliers and key business partners is known as a(n):

The correct answer is that an extranet linking a large firm to its suppliers and key business partners is known as a private industrial network. This type of network enables secure and efficient communication and collaboration between the large firm and its stakeholders, allowing for processes such as procurement, inventory management, and order fulfillment to occur seamlessly.

Private industrial networks are typically designed for a specific organization and its partners, which distinguishes them from public networks or more generalized marketplaces. They provide tailored access to information and services that are critical for maintaining business relationships and operational efficiency. By using such a network, businesses can streamline their operations, improve coordination, and enhance the overall supply chain efficiency.

In contrast, the other terms such as E-hub, marketspace, and exchange generally refer to broader online platforms or marketplaces that facilitate various transactions but do not specifically define the direct and secure connection between a firm and its selected suppliers or business partners.