c# qr code generator open source Enabling Secure Internet Access with ISA Server 2004 in C#

Painting QR Code in C# Enabling Secure Internet Access with ISA Server 2004

Summary
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Providing secure Internet access for users in an organization means that users can gain access to the resources they need, the connection to the Internet is secure, the data that users transfer to and from the Internet is secure, and users cannot download malicious programs from the Internet. ISA Server can be used to provide secure Internet access for internal clients and to implement the organization s Internet usage policy.
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Enabling Secure Internet Access with ISA Server 2004
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A proxy server is a server that is situated between a client application, such as a Web browser, and a server that the client is connecting to. By default, ISA Server is configured to operate as a proxy server for Web Proxy and Firewall client computers. ISA Server 2004 supports chaining multiple ISA Server computers together so that Internet requests are passed from one computer to another computer. ISA Server 2004 also supports the use of a dial-up connection to another network. Access rule elements are used to configure access rules. ISA Server 2004 supports the following access rule elements for enabling Internet access: protocol, user set, content type, schedule, and network objects. ISA Server provides several default access rule elements, but you can also create and configure new elements. ISA Server supports five authentication methods for restricting Internet access. They are: Basic authentication, Digest authentication, Integrated Windows authentication, digital certificates authentication, and RADIUS authentication. If you want to restrict access to the Internet based on users and groups, you must configure ISA Server authentication to meet your organization s needs and the types of ISA Server clients used by your organization. Access rules determine how clients on a source network can access resources on a destination network. In order to allow internal clients to access the Internet, you must configure an access rule that allows Internet access. To configure restrictions to Internet access, use access rule elements to create the required rules.
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Exam Highlights
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Before taking the exam, review the key points and terms that are presented in this chapter. You need to know this information.
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Key Points
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An organization s Internet usage policy is based on the organization s security requirements and the level of access required for employees to do their work. ISA Server 2004 can be used to implement many of the usage policy requirements. By default, ISA Server is configured as a proxy server for Web Proxy and Firewall clients. By default, ISA Server enables only integrated authentication. This means that if you want to use any Web browser clients other than Internet Explorer without deploying the Firewall client, you must enable additional authentication options. Access rules are built using access rule elements. Creating access rules is like building a puzzle. First you have to create puzzle pieces (the access rule elements), then you put the pieces together to create an access rule.
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Key Points and Key Terms
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Configuring access rules can be difficult if you have complicated requirements. You have to consider not only the rule elements but also rule order. The access rule order is most critical when troubleshooting access rule problems.
Key Terms
access rule Defines the conditions for when traffic will be allowed or denied between networks. access rule element An ISA Server configuration object that you can use when creating an access rule. Access rule elements include protocols, user sets, network objects, and schedules. Internet usage policy A policy defined by an organization that sets restrictions on the types of activities users at the organization can perform on the Internet.
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Enabling Secure Internet Access with ISA Server 2004
Questions and Answers
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Lesson 1 Review
1. What is the purpose of an Internet usage policy
The Internet usage policy defines what constitutes acceptable usage of Internet resources. The policy must be clear and concise, describing who can use the Internet and what applications are allowed or not allowed. It must also explain how violations of the policy will be handled and who is responsible for enforcing the policy.
2. You are the network administrator for your organization. The organization is using a packet-filtering firewall with limited functionality to provide access to the Internet. The organization is planning an ISA Server 2004 implementation and wants to exploit some of its advanced filtering options to limit the access users have to the Internet. What should be the first step for implementing ISA Server 2004 a. Install ISA Server 2004. b. Design the access rules that will enable access to the Internet. c. Create an Internet usage policy that defines the organization s security requirements. d. Design a server publishing strategy.
C is correct. The first step in implementing ISA Server 2004 is to create an Internet usage policy that defines the organization s security requirements. This policy becomes the basis for designing the access rules and for designing the server publishing strategy. ISA Server should be deployed only after the policy has been created and the Internet access and server publishing design have been completed.
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