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For example, how can you stop a corporate spy from accessing your wireless network from outside your building In a home network, what s to keep a neighbor from using your wireless network to gain access to your network resources and your personal data or to tap into your Internet connection In the past, these problems had few solutions. Fortunately, new security standards for wireless communications can set your mind at ease. Wired Equivalent Privacy (WEP) is an encryption algorithm system that s included as part of the IEEE 802.11 standard. It s commonly used and supported by wireless networking hardware devices. The WEP encryption algorithm sends data through the air in encrypted form. WEP can utilize either 40- or 104-bit shared encryption keys, along with a standard 24-bit initialization vector, which augments the shared keys to produce a different encryption key for each data packet. The combination of the encryption key and the initialization vector produces WEP keys with a total length of 64 or 128 bits. The WEP encryption standard prevents unauthorized access to the network as well as to the data that s being transmitted over the wireless network. WEP, however, does not define a key management protocol. A single WEP key can be configured on all the wireless clients and the wireless access point of a home network, but there is no way to manage or distribute WEP keys on a large organization s network; instead, they must be manually distributed and configured on each system. To provide a stronger authentication mechanism and a method to automatically distribute WEP encryption keys, the IEEE 802.1x standard was developed, and 802.11b uses this standard.

17:

This also facilitates the management of employees who are reassigned within an organization. It is much easier, for example, to move a user from the Accounting security group to the Marketing group than it is to reconfigure the many ACEs and ACLs required to permit the user to access the resources needed to perform the new job, and remove access to resources the user no longer needs.

The process of creating groups across domains involves the following steps:

that make it far less secure than the length of its encryption keys would imply. These flaws, along with best practices for securing your wireless network, are covered in Securing Network Protocols on page 588.

Administrators in each domain create global groups and add user accounts that have the same resource requirements to the global groups. A domain administrator creates a domain local group for each resource that exists within a domain, such as file shares or printers, and then adds the appropriate global groups from each domain to this domain local group. A domain administrator assigns the appropriate permissions for the resource to the domain local group. Users in each global group receive the required permissions because their global group is a member of the domain local group.

Effectively nesting groups in a multidomain environment reduces network traffic between domains and simplifies administration in a domain tree. The extent to which you can use nesting in your organization depends on whether you are operating in mixed mode or in native mode. In Windows 2000 mixed mode (which corresponds to Windows 2000 mixed functional level in domains running Windows Server 2003), only one type of nesting is available: global groups can be members of domain local groups. Universal groups do not exist in mixed mode. In Windows 2000 native mode (which corresponds to Windows 2000 native functional level or higher in domains running Windows Server 2003), multiple levels of nesting are available. The nesting rules for group memberships for Windows 2000 native mode domains (Windows 2000 native functional level or higher in domains running Windows Server 2003) are listed in Table 17-2.

You ll see a check box at the bottom of the License Terms page that enables Visual Studio to receive and display plenty of useful information, such as tips, blogs, and samples about .NET and Visual C#. If you clear it, you can always select it again when the product is installed by using the Tools menu.

Table 17-2