ISO/IEC 27001:2022 · Technological control
ISO 27001 Annex A 8.20: Networks security
Quick answer
ISO 27001 Annex A 8.20 (Networks security) is a technological control. Secure, manage and control networks and network devices to protect information in systems and applications.
What auditors look for
Auditors check that 8.20 is either justified as not applicable in your Statement of Applicability or implemented and working. Typical evidence includes:
- Network diagrams
- Firewall and device configurations
- Network security reviews
How to implement 8.20 in practice
- Keep network diagrams current
- Restrict management interfaces
- Review firewall rules regularly
- Name an owner for 8.20, decide how often it runs and file evidence each time, so the control is audit-ready all year.
Recording 8.20 in the Statement of Applicability
List 8.20 with whether it applies, the reason (usually the risks it treats or a legal or contractual requirement), its implementation status and where the evidence lives. If you exclude it, explain why none of your risks or obligations require it.