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Domain local versions of all groups except the Power Users and HelpServices groups plus a number of additional server-specific built-in groups are included on domain controllers. Users access to the local computer and network depends primarily on the computer local and domain local security groups to which their account belongs. In other words, users accounts identify who they are, and in some cases permissions and restrictions are set on an individual basis. However, the security groups to which the user belongs are primarily responsible for determining what permissions and restrictions govern his or her activities on the local computer and on the network. For more information about the rights and permissions of computer local groups, see Managing User Rights by Using Security Groups later in this chapter.

Built-in security principals apply to any account that is using the computer in a specified way. Built-in security principals allow you to configure security based on the manner in which a resource is being accessed.

In a completely wireless network, each computer can be outfitted with a wireless network adapter and configured in ad hoc mode. You do not need a wireless access point unless you are bridging two dissimilar networks, such as a wired Ethernet network and a wireless network. Ad hoc wireless networks are useful if you want to minimize the initial costs of bringing up a wireless network, if you don t need to connect to any outside networks, or if one of the ad hoc wireless hosts will also serve as an ICS host. In this latter configuration, the computer connected to the Internet acts as the ICS host, and the wireless clients access the Internet by connecting to the ICS host over the wireless network. With this configuration, ICS works the same way as it does in a wired network, as shown in the following illustration. You can learn more about setting up ICS in Using Internet Connection Sharing, page 301. Although ad hoc networks reduce the initial hardware cost of a wireless network, the limited range of each wireless card means that it s easy to disrupt network communications by moving computers too far apart from one another. This drastically limits the utility of ad hoc wireless networking in medium-to-large size network installations.

Part III:

The following built-in security principals apply to any user account that is using a computer running Windows XP Professional in the ways specified: Note

Several additional built-in security principals are available on computers running Windows 2000 Server.

When the first networks were developed, communication between computers was a delicate process. In most cases, a computer from a given manufacturer could only communicate with another computer from that same manufacturer. The few computers that were on networks at the time were on homogenous networks; that is, all the devices on these networks were (for the most part) from the same manufacturer. For example, a shop using IBM mainframes would only use IBM terminals so that computers could communicate with each other. If the network had the misfortune of needing equipment from multiple vendors, users would be lucky if one manufacturer s system

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Anonymous Logon. Network logons for which credentials are not provided. Users can-

Authenticated Users. Any user, except a user of the Guest account, who is authenticated locally by a trusted domain controller. This identity provides users with the rights necessary to operate the system as an end user. (The Guest account is never treated as an Authenticated User.) Creator Group. A placeholder in an inheritable ACE. When the ACE is inherited, the system replaces this SID with the SID for the primary group of the object s current owner. Creator Owner. Dialup.