---
type: "term"
title: "Domain Boundary"
description: "A point where responsibility spheres or control regimes change."
resource: "tlctc:term:domain-boundary"
tags:
  - "glossary"
---
# Domain Boundary

A point where responsibility spheres or control regimes change. Crossing a domain boundary means the attack moves from one set of applicable controls to a different set.

**Reference:** §4.2.2 (Global Definitions), §5.1.3

**Related reading:** [Topology of cyber attacks — Bridge vs Internal](https://www.tlctc.net/tlctc-topology-of-cyber-attacks.html)