c# .net print barcode Lesson 4 in C#.NET

Printer Quick Response Code in C#.NET Lesson 4

Lesson 4
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Configuring VPN Quarantine Control
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QR Code ISO/IEC18004 Creation In VS .NET
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Exam Tip
Creating QR Code In Visual Basic .NET
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By default, a route relationship is configured between the Internal network and both the VPN Clients and the Quarantined VPN Clients network when you install ISA Server. However, no access rule is created for network traffic between the VPN Clients network, the Quarantined VPN Clients network and the Internal network. If you use a network template to configure the ISA Server computer, an access rule is created that enables all protocol access from the VPN Clients network to the Internal network. Remember these default configurations if you see an exam question dealing with the network traffic restrictions between a VPN client and the Internal network.
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How to Prepare the Client-Side Script
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The quarantine script or program that you create to validate client configuration during remote access can be an executable file (*.exe), a script file (*.vbs) or a simple command file (*.cmd or *.bat). When you create the script, you need to configure it to perform a set of tests to ensure that the remote-access client complies with network security policy. For example, you could configure the script to ensure that a personal firewall is installed on the client computer, that the antivirus software on the computer is running and all files are current, or to check for any other option on the ISA Server computer.
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Real World
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Preparing the Client-Side Script
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The most complicated component of enabling quarantine control is planning and creating the client-side script. Part of the reason for this complexity is that the script can query almost any information on the client computer. For example, you can query the network configuration on the computer to determine if Internet Connection Sharing is enabled and whether a client firewall is installed and enabled. You can query computer attributes such as screen saver configuration or the password policies on the computer. One of the critical components that you should query is the antivirus software; is it installed and are all the detection files up-to-date To query these components, you can use scripting tools such as VBScript to query registry values, and to look for specific files on the client computers. If you use Windows 2000 and Windows XP clients, you can use Windows Management Instrumentation (WMI) interfaces to query virtually any operating system and many hardware values. However, the fact that these scripts can be so relatively powerful can also make writing them very complicated. For example, if your company supports more than one antivirus application, your script would have to check for all supported antivirus applications and ensure that at least one of them is installed and current. If you support more than one client firewall, you must scan for all supported versions. If users are allowed to install their own applications, they may have selected nonstandard installation locations so your script may have to be very flexible.
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10
Configuring Virtual Private Networks for Remote Clients and Networks
Because writing these scripts can be so complicated, you need considerable scripting expertise to plan and create the script. Ensure that your team includes an experienced script writer. In addition, start with a simple script and gradually implement more complexity. For example, you may want to start by checking for the presence of the antivirus software, and modify the script to check for the detection file versions only after you are sure that the script is working. You should also strictly limit the types of software that you will support. To simplify the script, you may choose to require all VPN clients to use the same antivirus software. Or you may choose to allow VPN access to only Windows XP clients with Service Pack 2 installed and Windows Firewall enabled. In addition, there are other concerns that you need to plan for in your VPN network quarantine deployment. For example, there are some configuration settings that you may want to check on the client computer that require Administrator privileges for the user. If you give your users Administrator privileges, you significantly increase the risk that the computers will be infected by malware and also make it harder to control what users do on their machines. If you want the users to be able to correct any configuration problems, they might need Administrator privileges. Another concern with network quarantine is that Rqs.exe and Rqc.exe may not be as secure as you would like; a malicious user may be able to spoof the approval message to the VPN server bypassing the quarantine without actually passing the checks. If you are using the Windows Server Resource Kit notification component, the script must run Rqc.exe if all the tests specified in the script are successful. Rqc.exe uses the following parameters:
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