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Lesson 1
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Reading QR Code ISO/IEC18004 In Visual C#
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Enabling Secure Access to Internet Resources
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Lesson 1: Enabling Secure Access to Internet Resources
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Before you can configure ISA Server to enable secure access to the Internet, you must understand what secure access means. Every organization defines this concept slightly differently because an important part of configuring secure access is defining limits to what resources users can access on the Internet. To define secure access, the organization needs to develop an Internet usage policy that prescribes how users can use the Internet. Then you can use this policy to design your ISA Server configuration to ensure that users have only the required access to the Internet. This chapter provides an overview of what is meant by secure access to the Internet, some high-level guidelines for developing an Internet usage policy and an overview of how you can use ISA Server to enforce the policy. The other lessons in the chapter provide the details of how to configure ISA Server to implement the policy.
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After this lesson, you will be able to
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Describe secure access to Internet resources List guidelines for creating an Internet usage policy Describe how ISA Server can provide secure access to Internet resources
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Estimated lesson time: 15 minutes
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What Is Secure Access to Internet Resources
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Almost all organizations provide some level of Internet access for their users. The use of the Internet as a source of information and e-mail as a communication tool means that most organizations cannot afford to be without access to the Internet. At the same time, ensuring that the connection to the Internet is secure is critical. So what is secure access to the Internet At a minimum, providing secure Internet access for users in an organization means the following:
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Users can access the resources that they need. To do their jobs, users in many organizations must be able to use a Web browser or other application to access Internet resources. The connection to the Internet is secure. Users must be reasonably sure that they will not be attacked through the Internet connection. Ideally, the connection to the Internet should not reveal any information about the internal system that can be used to launch an attack against the client computer. Information about the computer, such as the computer name, user logon name, and shared folders, as well as details about the network configuration for the client computer, such as the client Internet Protocol (IP) address, should be hidden.
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5
Enabling Secure Internet Access with ISA Server 2004
The data that users transfer to and from the Internet is secure. In some cases, users might send confidential personal information such as credit card information to the Internet or they might send private or confidential organizational information such as client data to the Internet. This data must be secured when it leaves the organization. If the data cannot be protected, you must prevent users from sending the information to the Internet. Users cannot download malicious programs from the Internet. One of the ways attackers gain access to your network is by getting users to download malicious content. You must prevent users from inadvertently or deliberately causing damage to the network by downloading viruses or Trojan horse applications to their client computers.
Secure access to the Internet also means that the user s actions comply with the organization s security or Internet usage policy. This means the following:
Only users who have permission to access the Internet can access the Internet. These users can use only approved protocols and applications to access Internet resources. These users can gain access only to approved Internet resources, or these users cannot gain access to denied Internet resources. These users can gain access to the Internet only in accordance with any other restrictions the organization may establish, such as when and from which computers access is permitted.
Real World
Security Trade-Offs
Implementing secure access to the Internet is rarely simple because you must always find a balance between competing interests within the organization. The people responsible for security want to have the most secure network possible. Often, it seems that the only way to satisfy them would be to disconnect your network from the Internet and not allow anyone to leave or enter the building carrying a mobile computer. On the other hand, you have the employees who are interested only in getting their jobs done (and maybe having a bit of fun on the Internet). And these users don t want any restrictions in place to prevent them from doing so. These users seem remarkably adept at presenting a situation in which almost any restriction you put in place will prevent them from doing their work. Obviously, this overstates the case, but I have worked with organizations in which this was close to reality. You can never please both groups completely, but in most cases, you can find a compromise. To do this, you must develop a plan that balances the following key trade-offs:
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