What evidence do auditors commonly ask for on I&S-09 Network Defense?

Network defence architecture showing layered controls (WAF, DDoS protection, IDS/IPS, segmentation); IDS or IPS alert records and response tickets; DDoS response runbook and test results; Periodic evaluation report of network defence effectiveness.

What is the most common gap auditors find on I&S-09?

Single perimeter control with no internal detection

CSA CCM v4.1 · I&S - Infrastructure Security

`I&S-09` Network Defense

Define, put in place and assess processes, procedures and layered defensive techniques to protect against, detect and respond promptly to network-based attacks.

Source: CSA CCM v4.1, I&S-09. 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 CSA CCM v4.1 in the compliance library.

Version 4.1 adds 11 controls (among them API security, log sanitisation and a service bill of materials) and renumbers several domains. CSA accepts v4.0.x during its transition; if your STAR assessment is still on v4.0.1, check the numbering against it.

artefacts

held by a system

at each review

moderate

to go live

SIEM / log platform

where the evidence lives

teal = a system already holds it · olive = produced at each review. To go live: easy when half or more of the artefacts are already held by a system, moderate from a quarter to a half, hard below a quarter.

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

IDS or IPS alert records and response tickets · SIEM / log platform

periodic reviewEvidence produced at each review

DDoS response runbook and test results · Source control / CI pipeline
Periodic evaluation report of network defence effectiveness · Cloud console / configuration management

governing documentDocuments that govern the control

Network defence architecture showing layered controls (WAF, DDoS protection, IDS/IPS, segmentation) · Policy repository / GRC workspace

First move

Start with the 1 of 4 artefacts that already live in a system (SIEM / log platform); keep the periodic reviews but log each one as a dated record with a named reviewer.

Common gaps auditors find

Single perimeter control with no internal detection
Alerts generated but not triaged in time
DDoS plan never exercised

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.

Build my evidence sheet

I&S-08 Network Architecture Documentation · IAM-01 Identity and Access Management Policy and Procedures