Does Nagios passive check support "real-time" monitor of hardware status

[Scott Xiao]

 Hi Does Nagios passive check support "real-time" monitor of hardware
status? For example, one network cable on a switch port is disconnected
and nagios UI will change to "down" in a few seconds and send alert
email/sms to IT team? Is NRPE or NSCA agent needed to install on the
monitored systems? But for switch/tape drive, not possible to install,
how shall we achieve the passive check instead of waiting 5 or 10
minutes to know it happens after a switch port is down? Any experience
or URL to share? Thanks !
[Scott Xiao] s

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