When configuring a security device so that, if the device itself fails, it will block all traffic rather than let it pass, which failure mode should you select?
Fail-open
Fail-closed
Fail-safe
Fail-soft
Fail-closed mode forces a security device to deny all traffic whenever the device loses power or otherwise becomes non-functional. This default-deny stance preserves the organization's security posture. By contrast, fail-open permits all traffic during a failure, prioritizing availability over security, and fail-safe or fail-soft have different goals such as life safety or graceful degradation.
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