c# qr code generator open source Configuring ISA Server as a Firewall in C#

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Configuring ISA Server as a Firewall
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What Are Network Templates
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ISA Server 2004 can be deployed in any of the perimeter network configurations. To simplify the deployment, ISA Server 2004 includes several network templates that you can use to configure ISA Server based on one of the perimeter network scenarios. A network template is stored in an Extensible Markup Language (XML) file that includes the following:
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Networks and network sets Network rules that describe the relationships between networks and network sets Access rule elements Access rules
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To apply a network template, run the Network Template Wizard. When you run the wizard, you can choose the level of access that will be enabled between networks. For example, you may want internal users to be able to access resources on the Internet using all protocols, but only use HTTP or HTTPS to access the perimeter network. The access rules created by the wizard are based on the level of access you grant.
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When you apply a network template, the Network Template Wizard overwrites your current ISA Server configuration with the settings provided in the template. If you have configured access rules that you want to retain, export the access rules before applying the network template, and then import the access rules after applying the template.
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ISA Server Template Types
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ISA Server 2004 provides the following templates:
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Edge Firewall This template assumes a network topology with ISA Server configured as a bastion host. One network interface is connected to the internal network, the other is connected to an external network (Internet). When you select this template, you can allow all outgoing traffic, or limit outgoing traffic to allow only Web access. 3-Leg Perimeter This template assumes a network topology with ISA Server configured as the firewall for a three-leg perimeter configuration. In this configuration, ISA Server has three network interfaces, one connected to the internal network, one connected to the external network, and one connected to a perimeter network. Front End This template assumes a network topology with ISA Server at the edge of a network, with another firewall configured at the back end, protecting the internal network.
Lesson 3
Implementing Perimeter Networks and Network Templates
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Back End This template assumes a network topology with ISA Server deployed between a perimeter network and the internal network, with another firewall located between the perimeter network and the Internet. Single Network Adapter This template assumes a single network adapter configuration within a perimeter or corporate network. In this configuration, ISA Server is used as a Web proxy and caching server.
Be familiar with each of these network templates and the default settings applied by the templates. When you see an exam question that mentions a network template, you should have a clear idea what the template does so that you can troubleshoot any problems with the template.
Exam Tip
How to Implement Network Templates
To implement a network template, run the Network Template Wizard. When you apply the template, you can select a firewall access policy that best matches your corporate security guidelines. For example, Table 7-3 lists the firewall policies available when you select the Edge Firewall network template and also details the rules that are created when you select the policy.
Table 7-3
Firewall Policies Applied by the Internet-Edge Template
Description Rules Created
Policy Name Block all
This policy blocks all network access None through ISA Server. This option does not create any access rules other than the default rule that blocks all access. Use this option when you want to define firewall policy on your own. This policy blocks all network access through ISA Server except for access to external network services such as DNS. This option is useful when services are provided by your ISP. Use this option when you want to define firewall policy on your own. Allow DNS from Internal network and VPN Clients network to External network (Internet).
Block Internet access, allow access to Internet service provider (ISP) network services Allow limited Web access
This policy allows limited Web access Allow HTTP, HTTPS, and FTP using HTTP, Hypertext Transfer Proto- from Internal network to External col Secure (HTTPS), and FTP only. All network. other network access is blocked
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