1. Email must be sent using SMTP in both directions through the firewall, but it

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1. Email must be sent using SMTP in both directions through the firewall, but it must be relayed via the DMZ gateway that provides header sanitization and content filtering. External email must be destined for the DMZ mail server. action/ src/ port/ dest/ port/ flags/ comment/ 2. Users inside may retrieve their email from the DMZ mail gateway, using either POP3 or POP3Sprotocol, and authenticate themselves. action src port dest port flags comment 3. Users outside may retrieve their email from the DMZ mail gateway, but only if they use the secure POP3 protocol and authenticate themselves. action src port dest port flags comment 4. Web requests (both secure and insecure) are allowed from any internal user out through the firewall but must be relayed via the DMZ Web Proxy, which provides content filtering (noting that this is not possible for secure requests), and users must authenticate with the proxy for logging. action src port dest port flags comment 5. Web requests (both secure and insecure) are allowed from anywhere on the Internet to the DMZ Web Server. action src port dest port flags comment 6. DNS lookup requests by internal users are allowed via the DMZ DNS server, which queries to the Internet. action src port dest port flags comment 7. External DNS requests are provided by the DMZ DMs server. action src port dest port flags comment 8. Management and update of information on the DMZ servers is allowed using secure shell connections from relevant authorized internal users (may have different sets of users on each system as appropriate). action src port dest port flags comment 9. SNMP management requests are permitted from the internal management hosts to the firewalls, with the firewalls also allowed to send management traps (notification of some event occurring) to the management hosts. action src port dest port flags comment

Explanation / Answer

it might help u http://mercury.webster.edu/aleshunas/COSC%205130/Chapter-22.pdf

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