An organization is implementing a security architecture for their critical infrastructure systems that control industrial equipment. Which physical network segmentation method provides the highest level of security by ensuring complete isolation from untrusted networks?
DMZ implementation
Physical air gap
In-band separation
Out-of-band segmentation
An air-gapped network provides the highest level of security through complete physical isolation from untrusted networks, including the internet. In an air-gapped environment, there is no physical connection between the secure network and any external networks, making it substantially more difficult for external threat actors to gain access through network-based attacks. This is why air-gapped networks are commonly used for critical infrastructure, military systems, and other high-security environments.
In-band management uses the same network path for both data and management traffic, which doesn't provide isolation. Out-of-band management uses a separate network for management traffic but still maintains connectivity. DMZ implementation creates buffer zones between networks but doesn't provide complete physical isolation.
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