施耐德产品140NOM21200 Quantum

140NOM21200 Quantum

在IT/OT融合基础之上还需要保证不同网络融合的性。生产网络隔离层，也叫缓冲区，这一层的功能是保证可信网络（工业网络）和不可行网络（企业网络）数据的。

近年来，工业自动化与控制系统（IACS）所遭受的网络攻击日益增多。例如在2010年，Stuxnet蠕虫攻击了伊朗的铀浓缩设施，2015年Black Energy 恶意软件攻击了乌克兰电网。这一连串的网络攻击表明，IACS本身的基本保障是非常缺乏的，一旦链接了IT网络，等于是将工业区完全暴露在危险之中。

所以在这一层，需要使用商业级和工业级两种防火墙，在入口和出口同时提供网络保障。由于两种防火墙的职责和访问权限不同，一个防火墙中配置的错误规则不会传播到另一个防火墙，从而能够降低风险并提高恢复能力。

另外，3.5层的出现，能够帮助网络管理员，更地监控整个OT网络，即使是多供应商环境中的网络和服务器组件，也可通过使用网络管理软件管理并监视。为网络提供实时保护和快速故障响应，实现及时修复、优化设备正常运行时间和性外，这层还肩负了无线终端和移动终端的接入，以及远程访问的功能，拓展了OT网络的区域的限制。

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