This month is the last of four installments on multi-layer network architectures. We talked about the need for satellite, fiber and wireless network architectures to include all layers in its designs. When they are integrated together to form one Internet, issues on internetworking appear at all layers including the Application Layer. All the more critical are network architectures with coherent multi-layer designs. This last piece addresses network security and resiliency and the need for a multi-layer approach to an effective design.

中文翻译：

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多层网络安全架构

本月是有关多层网络体系结构的四期文章的最后一部分。我们讨论了对卫星，光纤和无线网络架构的需求，以便在其设计中包括所有层。当它们集成在一起形成一个Internet时，有关Internet互联的问题就会出现在包括应用程序层在内的所有层上。更为关键的是具有一致的多层设计的网络体系结构。最后一部分介绍了网络安全性和弹性，以及对多层方法进行有效设计的需求。