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These packets, which do not meet the required standards of the network or application protocol running on the destination system, cause applications or services (or even the entire operating system) on the target machine to close or crash. Perhaps the most famous example of this type of attack is

Double-click Security Templates, right-click the default templates folder, and then click New Template.

This creates a blank template file without any security settings. You can now completely customize the template to meet the needs of your organization. Once you create your template or make all the desired changes to an existing template, it is automatically saved to the templates directory. By using Save As, you can overwrite the existing template of that name or save the template under a new name. Tip

Do not overwrite the default templates in case you later realize that the template you created does not work as desired.

the Ping of Death, where an Internet Control Message Protocol (ICMP) ping packet is sent with a gigantic packet size. Many IP stacks on several operating systems share a bug that causes the computer to crash when this packet is received.

Right-click the template name, select Save As from the shortcut menu, fill in a new name, and then click OK.

After you create a security template for your environment, you need to apply it to your computer. When you apply a template to existing security settings, the settings in the template are merged into the computer s security settings. To apply a security template to a computer 1. In the Group Policy snap-in, double-click Computer Configuration\Windows Settings. 2. Right-click Security Settings, and then click Import Policy.

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left for normal tasks, effectively making it unable to perform any other tasks. Some systems or services can even crash due to this overload. If properly executed, a traffic overload can flood the target computer s entire network. protocol or application without completing the connection. This consumes a limited resource on the target system, and if repeated enough times, can slow the computer to a halt. DoS attacks launched against individual computers were once a popular form of network attack. However, many of the flaws in the IP protocol (as well as in other application protocols) that left computers vulnerable to simple DoS attacks (such as those launched by one originator against one target) have been fixed. Additionally, network administrators are familiar with normal DoS attack signatures and can easily block traffic from individual computers or networks launching an attack. Today, DoS attacks are more commonly launched by multiple computers located across the Internet in what is called a distributed denial-of-service (DDoS) attack. To maximize the effect of such an attack, hackers take over computers across the Internet (using techniques that will be discussed later in this chapter), and then use all of these hacked computers to launch DoS attacks on a target computer or network. Because the traffic comes from multiple sources, it can quickly overload a network s routers and computers; for the same reason, blocking the attack can be extremely difficult.

3. Select the template file that you want to import into your environment. 4. Click OK. You can also export the security template for your system from the Group Policy snap-in by navigating to the \%systemroot%\Security\Templates folder and copying the appropriate template file to another network location or to a floppy disk. Performing security configuration tasks using security templates You can perform the following key security-related tasks by using Windows XP Professional security templates:

Configure permissions for a file system directory. Create a restricted Group Policy. Inherit, overwrite, and ignore policy changes. You can use the following procedure to

Configuring permissions for file system directories configure permissions for file system directories.

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