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Designing a local network that does not connect to the Internet is very simple and cer tainly much more secure than one that does connect. As soon as you decide to use public IP addresses and host Web servers for outsiders to access, you have opened many doors to intruders and hackers. In this chapter, you learn how to design a perimeter network, also called a DMZ (Demilitarization Zone), to help protect your company s internal network while still allowing outsiders, such as customers, potential customers, and potential employee candidates applying for positions at your company, and so on, to access your com pany s servers.

Function Adding, removing, or listing the security principals that belong to this group Adding, removing, or listing the groups to which this group belongs

In this practice, you will work with group memberships and nesting to identify which combinations of group memberships are possible.

In Figure 8-3, your internal network has access to the Internet. This, in itself, also means that Internet users have access to your internal network. This may not be what you were looking for when designing your network infrastructure but, unfortunately, you are stuck with this reality.

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1. If the domain functional level is not already set to Windows Server 2003, use the Active Directory Users And Computers MMC to raise the domain functional level to Windows Server 2003. 2. Create three global groups in the Users OU: Group 1, Group 2, and Group 3. 3. Create three user accounts: User 1, User 2, and User 3. 4. Make User 1, User 2, and User 3 members of Group 1. 5. Make Group 1 a member of Group 2. Which groups can now be converted to universal groups Test your theory. (You should be able to convert 2 of the 3 groups without error.)

There are many components you can use to help lessen the risks of intrusion to your network, including firewalls, proxies, and intrusion detection systems. Figure 8-4 introduces a perimeter firewall into the picture. A firewall can be hardwareor software-based. It acts as a boundary between your network and the outside world. Its job is to filter traffic entering and leaving your network.

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You can modify the properties of a distribution group by starting the Exchange Management Console, expanding Recipient Configuration, and clicking Distribution Group. In the Result pane, select the distribution group you want to modify, and in the Actions pane, click Properties under the group name. The Properties dialog box for a distribution group called Sales is shown in Figure 3-16. Don Hall s account has been added to the group.

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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. In the properties of a group, which tab will you access to add users to the group

2. You want to nest the IT Administrators group responsible for the Sales group inside the Sales group so that its members will have access to the same resources (set by permissions in an ACL) as the Sales group. From the Properties page of the IT Administrators group, what tab will you access to make this setting

Figure 8-4

3. If your environment consists of two domains, one Windows Server 2003 and one Windows NT 4, what group scopes can you use for assigning permissions on any resource on any domain-member computer

Routers can also be configured, through the use of access lists, to behave as firewalls. An access list filters traffic based on different criteria, such as the destination or source IP address of a packet; the protocol that is being used, such as User Datagram Protocol (UDP) or TCP; the port ID, such as port 80, port 110 (Post Office Protocol [POP]3); and so on. There are several different types of firewalls with which you should be familiar:

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