What is the difference between network isolation and network segmentation?

Network segmentation divides a network into zones that may still exchange traffic under defined rules. Network isolation enforces strict or complete separation. Air-gapped networks are the most extreme form — no electronic communication path at all.

Why is network isolation important for OT and ICS environments?

OT/ICS networks control physical infrastructure. Isolation prevents IT-originating attacks reaching OT where a breach can cause operational disruption or physical damage. IEC 62443, NERC CIP, and NIS2 all mandate isolation controls for these environments.

Is an air-gapped network truly secure?

Air-gapped networks provide very high baseline security but are not impenetrable. Stuxnet breached air-gapped nuclear systems via USB. Best practice combines air-gapping with CDR-based file sanitization on all data entering the isolated environment.

What regulations require network isolation?

EU NIS2, IEC 62443, NERC CIP, HIPAA, PCI DSS v4.0, NIST SP 800-82, and DORA all require network isolation or segmentation. NIS2 non-compliance can result in fines up to €10 million or 2% of global annual turnover.

How does CDR support network isolation?

CDR sanitizes files crossing isolation boundaries by removing malicious content while preserving business information. It is effective against known and zero-day threats because it does not rely on signatures — essential where a single malware delivery could be catastrophic.

What is Network Isolation?

Q: What is network isolation?

Network isolation restricts or completely blocks communication between network segments. It prevents threats spreading laterally across infrastructure by creating controlled boundaries between systems, users, and data assets.

Explore network isolation techniques that create secure boundaries between systems to prevent lateral movement and protect critical assets.

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