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Microsoft Windows XP Professional and Microsoft Windows XP Home Edition both support wireless networking. If you are planning on using a wireless network, Windows XP is the easiest operating system to configure and use on a wireless network. Windows XP supports infrared networking as well as the 802.11b (or Wi-Fi) and 802.11a (which might soon also be included under the Wi-Fi umbrella) standards. IEEE 802.11b is the accepted standard among most hardware manufacturers today. With speeds up to 11 Mbps, it has a range of up to 300 feet from point to point and offers wireless security standards as well. There are currently several thousand 802.11b public access points available in the United States. The rest of this chapter focuses on infrared and 802.11b/802.11a technologies because they re the most popular standards and the ones best supported in Windows XP.

Although Windows XP Professional incorporates highly advanced security features, effective access control must combine the proper use of Windows XP Professional based technologies with good planning. Security features are only as good as the methods used to employ and manage them. Tip

To improve the security of your network, provide each user, computer, and service with the least number of privileges needed to perform their tasks and run their applications. Windows XP Professional includes improved features including well-defined default security groups, Restricted Software settings, and the Secondary Logon Service (SLS) to make this possible. For information about SLS, see 16, Understanding Logon and Authentication. For information about Restricted Software settings, see Software Restriction Policies later in this chapter.

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Consider developing an access control plan that describes how you will use Windows XP Professional features to establish a secure, usable environment. A typical access control plan might include the following sections:

Enumerate the types of security hazards that affect your enterprise, including what poses the threats and how significant these threats are.

Security strategies. Describe the general security strategies necessary to meet the threats and mitigate the risks. Security group descriptions. Define the security restrictions or permissions that might apply to different groups of users and resources, and then create security groups to help you implement these sets of permissions and restrictions. Security policy. If you add your Windows XP Professional based clients to an Active Directory environment, you can use the Security Settings extension to Group Policy to define and enforce your security strategy on any number of computers.

Windows XP is optimized for two kinds of wireless networking infrared and Wi-Fi. Each network type has its own advantages and challenges, and is typically used for different purposes. The following sections examine how infrared and Wi-Fi networking work in Windows XP.

Define how you plan to implement information security solutions, such as an Encrypting File System (EFS), and access authorization by using permissions. For more information about EFS, see 18, Using Encrypting File System.

Information security strategies. Administrative policies. Document policies for delegation of administrative tasks and monitoring of audit logs to detect suspicious activity.

Opening Your Application, 90 Interacting Through Dialog Boxes, 100 Having a Professional Look and Feel at Your Fingertips, 106

Your access control plan can contain additional sections, but these are suggested as a starting point. If possible, test and revise all aspects of your access control plans by using a test laboratory that closely resembles your organization s computing environment. Also, conduct pilot deployments to further test and refine your access control plans.

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Files not cached At logoff, delete local copy of user s offline files Encrypt the Offline Files cache Prohibit user configuration of Offline Files

Synchronize all offline files before logging off Synchronize all offline files when logging on Synchronize all offline files before a suspend Action on server disconnect