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Use Message Screener for inbound messages only In this configuration, you configure ISA Server to publish the server running Message Screener, and configure Message Screener to forward all allowed messages to the computers running Exchange Server on the internal network. You also configure the access rule on ISA Server to allow the internal computers running Exchange Server to send SMTP messages to the Internet. Use this configuration if your organization has no requirement to scan outbound message contents. Use Message Screener for inbound and outbound messages In this configuration, you configure ISA Server to publish the server running Message Screener, and configure Message Screener to forward all approved messages to the computers running Exchange Server on the internal network. You also configure the internal computers running Exchange Server to send all SMTP messages to the server running Message Screener. Message Screener scans outbound messages and then forwards the messages through ISA Server to the Internet. In this scenario, the server running Message Screener must be able to use DNS to locate the mail servers for both the internal and external DNS domains. Use this configuration to ensure the security of outbound e-mail. For example, you can use Message Screener to scan outbound messages for specific content or to block messages with specified attachments.

You can verify that the DHCP Relay Agent is functioning by using the Routing And Remote Access console. To do so, select the DHCP Relay Agent node and view the sta tistics in the details pane. The details pane compiles requests received, replies received, requests discarded, and replies discarded. If this data reveals that both requests and replies have been received, the DHCP Relay Agent is functioning.

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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. What is a weakness of RIP authentication

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2. Besides using RIP authentication, how can you deter rogue routers from providing incorrect routes to your network routers through RIP

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If you are using Internet e-mail, it is virtually inevitable that you will be exposed to unwanted e-mail If you are responsible for managing a messaging infrastructure for your organization, one of your biggest headaches will be keeping such unwanted e-mail out of your organization Although you can use ISA Server to provide some protection against spam and viruses, the ISA Server Message Screener just doesn t provide enough functionality for most organizations There are much better options available for keeping unwanted e-mail out of your organization One option is to make use of the spam-filtering features included with Exchange Server 2003 One of the options available in Exchange Server 2003 is the use of a real-time block list (RBL) To configure RBL support, configure the Exchange Server computer to send a query to an RBL provider.

The Marketing department is complaining about print quality on the MarketingPrinter. When they print from their Windows XP desktops using Microsoft Office applications, documents print perfectly. But when they print from Adobe applications, the docu ments do not always reflect the desired results. The Sales department, which uses a mix of Windows 2000 and Windows XP workstations, Microsoft Office, and Microsoft Customer Relationship Management (CRM), does not report any problems with the SalesPrinter. As you consider the problem, it occurs to you that some applications produce different results depending on whether the printer is using PostScript or a non-PostScript driver.

4. You want to deploy one DHCP server on your network that consists of two subnets. What are two methods that will enable you to achieve this task

The RBL provider maintains a list of all the IP addresses for known sources of spam When you enable RBL filtering, the Exchange Server computer will send a query to the RBL provider to check if the IP address of the SMTP server that is attempting to make a connection is on the RBL If the address is on the list, the connection is dropped Exchange Server 2003 also supports Intelligent Message Filter, which allows you to configure what levels of spam will be blocked at the Exchange Server computers and what messages will be sent to the Junk E-Mail folder in Outlook 2003 There are also excellent third-party products available for message screening using SMTP gateway servers.

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