I'm trying to find a term...and its harder to find than I thought.
Given a group of computers are within a network boundary, and have a set of user accounts (system admins) setup to oversee computers within that network boundary, what is that cohesive group called?
From a windows AD point of view, its a 'domain', from a networking point of view, a single-network-boundary seems to be the term. But I'm talking from a generic, as in if there is a novell or other LDAP managed system rather than AD (or AWS IAM for example, with VPC as the network boundary), and a single collection of computers may still have many network netmasks/tiers where the app servers in one tier talk to database servers in another tier, but as (usually often) the case there is one set of management/sysadmin accounts that oversee them all.
(in the case of an app tier with one set of sysadmins, and a different db tier with their own sysadmins, this 'term' could also apply if there is a hard network boundary to cross).
Note that the focus is on the collection of servers, and the sysadmins who oversee them, keep them patched, work with various stakeholders with different software....not necessarily the 'network admin' if a single network admin manages the boundary of multiple 'domain/term/etc', only that the perceived understanding is that this collection of 'term-we-are-trying-to-find' is mostly self-contained.
Any thoughts or possibly other terms that have similar meaning/definition?