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DC/GC DC/GC DC/GC DC/GC Front-end Exchange Front-end Exchange Front-end Exchange Front-end Exchange Front-end Exchange Front-end Exchange Back-end Exchange Back-end Exchange Back-end Exchange Back-end Exchange Back-end Exchange Back-end Exchange Public Web server Public Web server Public Web server Public Web server Public FTP Server Public FTP Server Public FTP Server Public FTP Server Router Router Front-end Packet filter based “hardware” firewall Front-end Packet filter based “hardware” firewall Front-end Packet filter based “hardware” firewall