FIREWALL using the ISA software aims to prevent the attacks from outside and inside. The Cisco Catalyst 3560 series switches use (layer 3), divided into three VLANs, each vlan to each Department. SRV is the physical server. Server SRV1 virtual server functions DC, DNS, DHCP Server SRV2 virtual server function File Server, Database to Web Server SRV3 Virtual Server Web Server SRV3 SRV simulation Server hosting SAN SAN.
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