Network isolation can be achieved using what kind of logical network attribute?

An Untrust Zone is a security concept referring to an exposed network segment, not a method for achieving internal network isolation.

A Wide Area Network (WAN) connects networks over large geographical distances; it is a type of network, not a logical attribute for internal isolation.

A Virtual Local Area Network (VLAN) is a logical segmentation of a physical network, allowing devices to be grouped and isolated from other groups, even on the same switch. This provides network isolation and enhances security and management.

A Trust Zone is a security concept referring to a secure internal network segment, not a method for achieving internal network isolation.