安全交换机所在的内部网存在的一个显著问题就是网络链路协议不可控，使得任何遵守标准协议的网络访问在底层机制上都是合法的。
A notable problem is raised that the data link can not be controlled; therefore any access following the standard Ethernet data link layer protocol is recognized as legal.
安全交换机所在的内部网存在的一个显著问题就是网络链路协议不可控，使得任何遵守标准协议的网络访问在底层机制上都是合法的。
A notable problem is raised that the data link can not be controlled; therefore any access following the standard Ethernet data link layer protocol is recognized as legal.
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