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The terminology that describes the outermost boundary of a network zone is "Network perimeter." This term refers to the edge or boundary of a network where it interfaces with external networks, like the internet. It is a critical concept in network security, as it represents the point where external threats can attempt to breach the internal network. The network perimeter typically includes various security measures such as firewalls, intrusion detection systems, and other devices designed to protect the internal resources from unauthorized access.

Understanding the network perimeter is essential because this is where security protocols are implemented to regulate data flows and block potential attacks or intrusions. In contrast, zone boundaries often refer to divisions within a network that may group together devices or segments for specific security policies, firewalls are security devices that enforce these policies, and access control lists are rules that define what traffic is allowed or denied through those firewalls. Although these concepts are related to network security, they do not specifically describe the foundational boundary of the network itself.