Final answer:
The technology that facilitates a secure connection between two networks using a secure protocol is Tunneling, which is often used in the implementation of VPNs.
Step-by-step explanation:
The technology that allows a connection to be made between two networks using a secure protocol is A. Tunneling. Tunneling encapsulates a network protocol within packets carried by the second network. A common use of tunneling technology is in the creation of Virtual Private Networks (VPNs), where the secure tunnel protects the data from eavesdropping or interception as it travels over the internet. Unlike Tunneling, a VLAN (B) is used to segment a physical network into separate, logical networks. The Internet (C) is the global system of interconnected computer networks that use the Internet protocol suite. An Extranet (D) is a controlled private network that allows access to partners, vendors, and suppliers or an authorized set of customers – normally to a specific subset of the information accessible from an organization’s intranet.