A.8.22 Segregation of networks
Within its networks the organization is to keep groups of users, information services and information systems apart. Purpose (stated in ISO/IEC 27002:2022): divides the network along security boundaries and governs traffic across them by business need. As an Annex A reference control, it is compared with the controls determined in risk treatment (6.1.3 c) and recorded in the Statement of Applicability as included or excluded, with the justification and implementation status (6.1.3 d); implementation guidance is ISO/IEC 27002:2022 8.22.
Source: ISO/IEC 27001:2022, A.8.22. The statement above is our statement of the clause, read from the published text and cited so you can check it against the official text, not the instrument verbatim. Open ISO/IEC 27001:2022 in the compliance library.
Clauses 4 to 10 are the management-system requirements: none of them can be excluded when an organisation claims conformity. The 93 Annex A controls are a reference set: one may be excluded with a justification in the Statement of Applicability. Certification bodies assess conformity; the evidence lists here are what auditors commonly ask for, not a list the standard prescribes.
These are the artefacts auditors commonly ask for on this requirement, our guidance rather than text from the standard. Your assessor decides what is sufficient in your context, and asks for samples across the period when a report covers one.
system holds itEvidence a system already holds
- Firewall or filtering router rules controlling traffic between domains, with rule review records · Cloud console / configuration management
- Configuration showing guest wireless separated from staff networks with restrictions at least as strict · Cloud console / configuration management
periodic reviewEvidence produced at each review
- Evidence that sensitive environments treat wireless as external and route it through a gateway · Cloud console / configuration management
governing documentDocuments that govern the control
- Statement of Applicability entry for control A.8.22, showing inclusion or justified exclusion, implementation status and the risks it treats · Policy repository / GRC workspace
- Network segmentation design defining domains by trust, criticality, sensitivity or organizational unit, with the assessment that justified it · Policy repository / GRC workspace
First move
Common gaps auditors find
- A flat network lets any workstation reach servers and management interfaces
- Guest WiFi has fewer restrictions than staff WiFi, so staff use it to bypass controls
- Inter-domain rules have become overly permissive 'any-any' rules
- Partner network connections land inside internal networks without a gateway
Do this for your whole sheet
Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.
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