Fail-closed is a security posture that ensures when a device encounters a failure, it will default to a state that blocks all traffic, reducing the risk of unauthorized access during the downtime. On the other hand, a fail-open configuration would allow all traffic through, which could be risky as it might permit unsecured or malicious traffic.
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What does it mean for a device to fail-closed?
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What are the risks associated with a fail-open configuration?
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Can you give examples of devices that would use a fail-closed configuration?