Programs that are more sophisticated might use operating system signals and Simple Network Management Protocol (SNMP) to manage availability.
更复杂的程序可能使用操作系统信号和简单网络管理协议（Simple Network Management Protocol，SNMP）管理可用性。
Programs that are more sophisticated might use operating system signals and Simple Network Management Protocol (SNMP) to manage availability.
更复杂的程序可能使用操作系统信号和简单网络管理协议（Simple Network Management Protocol，SNMP）管理可用性。
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