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Lesson 1
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Recognizing Denso QR Bar Code In Visual C#.NET
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Introduction to ISA Server as a Firewall
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Decode Bar Code In Visual C#
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7-11
Printing QR In VS .NET
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Print QR Code 2d Barcode In Visual Studio .NET
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c. By blocking connections to particular ports d. By allowing or disallowing traffic based on connection rules 3. What feature of ISA Server prevents IP addresses that logically appear on the Internal network from entering your network through the external interface a. Egress filtering b. Ingress filtering c. Application-layer filtering d. Stateful filtering
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Lesson Summary
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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 network traffic that should be allowed from network traffic that should be blocked. Packet filters control access to the network by inspecting the packet network and transport layer information and allowing or denying the IP packets based on that inspection. Stateful filtering not only examines the packet header information, but examines the status of the packet as well. This check can be performed at both the transport and application layers. Application filtering enables the firewall to inspect the application data in a TCP/ IP packet for unacceptable commands and data. Application-layer filtering can be used to stop attacks from sources such as viruses and worms. An intrusion-detection system is located at the edge of a network or at different points in the network and inspects all traffic in and out of the network by identifying patterns that may indicate a network or system attack.
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7-12
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7
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Configuring ISA Server as a Firewall
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Lesson 2: Configuring Multiple Networking on ISA Server
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The role of a firewall is to block all traffic from flowing from one network to another unless that traffic is explicitly permitted. To understand how ISA Server works as a firewall, you first need to know how ISA Server implements networks.
After this lesson, you will be able to
Describe multinetworking Describe the default networks configured in ISA Server 2004 Create and modify network objects Configure network rules
Estimated lesson time: 25 minutes
ISA Server Support for Multiple Networks
ISA Server 2004 uses networks to define blocks of IP addresses that may be directly attached to the ISA Server computer or IP addresses that may be remote networks. ISA Server uses these networks as components when you create access rules. ISA Server supports an unlimited number of networks.
Note ISA Server 2000 supports only three networks: the Internal network, the External network, and a perimeter network (also known as a demilitarized zone, or DMZ, or a screened subnet). One of the significant enhancements in ISA Server 2004 is that it supports an unlimited number of networks.
What Is Multinetworking
Multinetworking 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. Multinetworking enables flexible options for network configuration. One common network configuration is a three-legged firewall, as shown in Figure 7-1.
Lesson 2
Configuring Multiple Networking on ISA Server
7-13
Web Server
Perimeter Network File Server E-Mail Server
Internet Internal Network ISA Server
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Figure 7-1
A three-legged firewall configuration
In this configuration, you create three networks:
The servers that are accessible from the Internet are usually isolated on their own network, such as a perimeter network. The internal client computers and servers that are not accessible from the Internet are located on an internal network. The third network is the Internet.
ISA Server multinetworking functionality supports this configuration. You can configure how clients on the corporate network access the perimeter network, and how external clients access the perimeter network. You can also define access rules for all network traffic flowing from the Internal network to the Internet. You can also configure the relationships between the various networks, defining different network rules between each network.
The client s membership in a network is automatically assigned. In the case of local area network (LAN) connected clients, a computer becomes a network member based on the computer s IP address; in the case of virtual private network (VPN) clients, a computer becomes a network member based on its connection method.
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