---
type: "term"
title: "Internal Cluster"
description: "A TLCTC cluster that operates primarily within the software domain's attack surfaces, without inherently crossing to a different responsibility sphere."
resource: "tlctc:term:internal-cluster"
tags:
  - "glossary"
---
# Internal Cluster

A TLCTC cluster that operates primarily **within the software domain's** attack surfaces, without inherently crossing to a different responsibility sphere. Internal clusters are: `#1` through `#7`.

**Reference:** §4.2.2 (Global Definitions), §5.1.5, §5.2 (Topology Classification)