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Scenario 1 Question
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1. How will you configure ISA Server 2004 to meet the security requirements
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Configuring ISA Server as a Firewall
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Troubleshooting Lab
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In this lab, you will troubleshoot an HTTP Web filter problem. The new security policy in your organization prohibits the use of MSN Messenger and Windows Messenger from your internal network to the Internet. You need to block the use of these applications on your firewall.
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Exercise 1: Testing Internet Access Using MSN Messenger
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1. On CLIENT1, start MSN Messenger or Windows Messenger from the Start menu. 2. Log on using your account. Ensure that you can access the Internet using MSN Messenger or Windows Messenger.
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Exercise 2: Configuring the HTTP Web Filter to Block an Application
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1. On ISA1, start ISA Server Management Console. Click Firewall Policy. 2. Right-click the Web Access Only access rule and click Configure HTTP. 3. In the Configure HTTP Policy For Rule dialog box, click the Signature tab. Click Add. 4. In the Name text box, type Block MSN Messenger. 5. From the Search In list, click Request Headers. 6. In the HTTP header box, type User-Agent. 7. In the Signature box, type MSN Messenger. 8. Click Add again. 9. In the Name text box, type Block Windows Messenger. 10. From the Search In list, click Request Headers. 11. In the HTTP header box, type User-Agent. 12. In the Signature box, type MSMSGS. 13. Click OK to close the Signature box and then click OK to close the Configure HTTP Policy For Rule dialog box. 14. Click Apply to apply the changes.
Exercise 3: Testing the HTTP Web Filter Signature Block
1. On CLIENT1, try to access the Internet using MSN Messenger or Windows Messenger. 2. Confirm that you cannot access the Internet using these applications.
Summary
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Summary
Firewalls are used to limit network traffic from one network to another. Firewalls use packet filters, stateful filters, application filters, and intrusion detection to distinguish between network traffic that should be allowed and network traffic that should be blocked. ISA Server 2004 supports multi-networking, which means that you can configure multiple networks on ISA Server, and then configure network and access rules that inspect and filter all network traffic between all networks. ISA Server comes preconfigured with the following networks: Local Host, External, Internal, VPN Clients, and Quarantined VPN Clients. Network rules determine whether there is a relationship between two network entities and whether the relationship is a route and network address translation (NAT) relationship. A perimeter network is a network that you set up separately from an internal network and the Internet. There are three general types of network perimeter configurations; bastion host, three-legged configuration, and back-to-back configuration. The network templates included with ISA Server 2004 include preconfigured networks and network sets, network rules, access rule elements, and access rules. The templates are designed to simplify the process of configuring ISA Server. The purpose of intrusion detection is to detect network attacks as early as possible to ensure that appropriate corrective actions can be taken. ISA Server provides intrusion detection for well-known IP attacks and also provides built-in application filters that detect DNS protocol and Post Office Protocol (POP) intrusions. IP preferences are used to configure how ISA Server will handle specific IP packets. You can configure the following IP preferences on ISA Server: IP Option, IP fragments, and IP Routing. Application filters work with the firewall service in ISA Server to intercept and process network packets as they pass through ISA Server. ISA Server application filters can be used to implement various types of functionality on ISA Server. Web filters extend the functionality of the firewall service in ISA Server by providing advanced filtering capability for HTTP packets as they pass through ISA Server. One of the most important Web filters included with ISA Server 2004 is the HTTP filter. HTTP filters are applied on a per-rule basis. To configure the HTTP filters on a particular access rule or Web publishing rule, you must modify the HTTP policy for that rule.
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