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Example: Applying Security Layers to IP Networks Applying Security Layers to IP Networks Infrastructure Security Layer Individual routers, servers Communication links Services Security Layer Basic IP transport IP support services (e.g., AAA, DNS, DHCP) Value-added services: (e.g., VPN, VoIP, QoS) Applications Security Layer Basic applications (e.g. FTP, web access) Fundamental applications (e.g., email) High-end applications (e.g., e-commerce, e-training) |