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In multilayered security infrastructure, the layers are projected in a way that vulnerability of one layer could not compromise the other layers and thus the whole system is not vulnerable. This paper evaluates security mechanism on application, transport and network layers of ISO/OSI reference model and gives examples of today's most popular security protocols applied in each of mentioned layers. A secure computer network system is recommended that consists of combined security mechanisms on three different ISO/OSI reference model layers : application layer security based on strong user authentication, digital signature, confidentiality protection, digital certificates and hardware tokens.
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