Overview#
Dividing networks into zones to limit lateral movement. Implemented with VLANs, firewalls, and access controls aligned to trust boundaries.
Core objectives#
- Establish shared definitions of Network Segmentation for security, engineering, and leadership teams.
- Connect Network Segmentation activities to measurable risk reduction and resilience goals.
- Provide onboarding notes so new team members can quickly understand how Network Segmentation works here.
Implementation notes#
- Identify the primary owner for Network Segmentation, the data sources involved, and the systems affected.
- Document the minimum viable process, tooling, and runbooks that keep Network Segmentation healthy.
- Map Network Segmentation practices to standards such as ISO/IEC 27001, NIST CSF, or CIS Controls.
Operational signals#
- Leading indicators: early warnings that Network Segmentation might degrade (e.g., backlog growth, noisy alerts, or missed SLAs).
- Lagging indicators: realized impact that shows Network Segmentation failed or needs investment (e.g., incidents, audit findings).
- Feedback loops: retrospectives and metrics reviews that tune Network Segmentation continuously.
Related practices#
- Align Network Segmentation with defense-in-depth planning, threat modeling, and disaster recovery tests.
- Communicate updates to stakeholders through concise briefs, dashboards, and internal FAQs.
- Pair Network Segmentation improvements with tabletop exercises to validate expectations.