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Every Windows 2000 (or Windows Server 2003) domain and every Windows XP Professional based computer has a DNS name. Thus, domains and computers are represented both as Active Directory objects and as DNS nodes. (A node in the DNS hierarchy represents a domain or a computer.) When you add a computer to a Windows 2000 or Windows Server 2003 domain, you need to specify the FQDN, consisting of the computer name and domain name. This information is provided when you add the computer account to the domain during or after initial Windows XP Professional Setup. For more information about adding Windows XP Professional based clients to a Windows 2000 or Windows Server 2003 domain, see Joining the Network Environment later in this chapter.

G 10.0.0.0 through 10.255.255.255 G 172.16.0.0 through 172.31.255.255 G 192.168.0.0 through 192.168.255.255

Part IV:

Although the two namespaces can share an identical domain structure, it is important to understand that they are not the same namespace. Each stores different data and therefore manages different objects. DNS stores zones and resource records, and Active Directory stores domains and domain objects. Note

Not every client needs to be visible to the Internet and not every company that wants to implement Active Directory needs to be on the Internet.

IP routers on the Internet will not route traffic across the Internet using one of these IP addresses. If, however, someone wants to provide Internet access to hosts using a private IP network, a network address translation (NAT) device is used. NAT devices forward the appropriate traffic sent from the private IP addresses through a single or a few public addresses typically the IP address of a router that securely links the private network (LAN) to the public network (Internet) and maintain an internal table that allows response traffic to be routed to the proper initiating private host.

Figure 6-18 WPF (left) vs. Windows form (right)

For more information about configuring the DNS client, see 24, Configuring IP Addressing and Name Resolution. For more conceptual information about DNS and the Windows 2000 DNS service, see Introduction to DNS and Windows 2000 DNS in the Microsoft Windows 2000 Server TCP/IP Core Networking Guide.

In addition to being able to use Active Directory domain controllers, Windows XP Professional based computers can access domain controllers used in Windows NT 4.0 domains. Like Active Directory, the Windows NT 4.0 account database includes the following two types of accounts in its domain environment:

NAT can be used to maintain a subnet of private network IP addresses hidden from the public Internet. This is a useful safety feature, and some home and small office networking hardware, such as residential gateways, use NAT. You can learn more about these options in 3, Creating Network Connections.

Computer accounts. Windows NT 4.0 based, Windows 2000 based, and Windows XP Professional based computers that can access the domain. User accounts.

Shared resources defined within the domain are associated with accounts by using ACEs, which determine the permissions to domain resources such as shared files and printers. A Windows XP Professional based computer can access objects stored in a Windows NT account database without modification. Typically, a Windows XP Professional based computer uses Kerberos V5 authentication to find a Windows 2000 based or Windows Server 2003 based domain controller. A Windows XP Professional based computer that is authenticating against a Windows NT 4.0 domain controller uses NTLM as its security protocol. For information about Kerberos V5 authentication, see Account Authentication later in this chapter.

Typically, a computer and its stored information must be protected from unauthorized access. Windows XP Professional secures the computer by using account authentication, which can prevent a user from accessing a computer or domain. Account authentication is the process of confirming the identity of a user by verifying a user s login name and password or smartcard information against data stored in an account database either locally or on a domain controller. After authentication identifies the user, the user is granted access to a specific set of network

The TCP/IP protocol suite is installed by default on all Windows XP installations. There is a wide array of configurable settings, and the options of each setting as well as the procedures for making changes to them will be explored. To access the TCP/IP properties, follow these steps:

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