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Computers and devices connect to wireless access points. Access points function as network bridges between the wireless clients and a wired network infrastructure. When a user enters the transmission area of an infrastructure network, where the access points broadcast their service set identifier (SSID), Windows XP automatically attempts to connect to the access point from which it gets the strongest

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signal. For example, your organization might have more than one building equipped with a wireless network. When a user moves between buildings, Windows XP will always connect to the wireless network without intervention from the user.

Disabling SSID broadcasting does not provide any degree of protection for your wireless network and will prevent Wireless Zero Configuration from working properly the first time a client attempt to locate the wireless network. Because wireless networks simply rely on radio waves, you cannot prevent anyone from receiving the signal provided they are close enough to the transmission point given the strength of their receiving antennae the mere presence of the wireless network is enough for detection.

One of the major gripes in the past has been delay for example, you say something and then have to wait for the transmission to move your voice to the contact s speakers. Delay has been reduced to as low as 70 milliseconds (assuming ideal latency conditions), which is hardly noticeable. Windows Messenger can use different codecs, software that encodes and decodes audio or video messages, so that the voice quality can be adjusted as needed due to the networking conditions. Windows Messenger also uses an echo cancellation feature that helps eliminate echo often caused by typical microphone and speaker use. Of course, not all voice calls are perfect using Windows Messenger, but when networking conditions are good, you can get surprisingly fast transmission results, even when using a modem. Before attempting to use voice calls, keep in mind that any firewall or router in the pathway must support UPnP for voice calls to work. See Connecting Through a Firewall, page 222, for more details.

Ad hoc networks are formed when computers and devices with wireless network connectivity connect directly to each other instead of connecting to access points. Unlike infrastructure networks, which operate as network bridges to other networks, ad hoc networks allow you to access resources only on the computer or devices that you connect to.

By default, Windows XP connects to both infrastructure networks and ad hoc networks, even those that the computer has not connected to before. For security purposes, you might not want the laptop computers in your organization to connect to untrusted networks automatically. You can define how Windows XP connects to wireless networks in the advanced wireless network connection properties. To increase the security of Windows XP laptops with wireless network cards, you should select to connect to only infrastructure networks and deselect the option to automatically connect to nonpreferred networks, which are networks that are not stored as preferred networks in the wireless network configuration utility (shown in Figure 20-1).

Figure 20-1

Kerberos authentication An openstandard authentication mechanism used to securely authenticate users, typically over a public medium such as the Internet. Kerberos allows computers as well as users to be uniquely identified without transmitting identification data in clear text (which could be intercepted). See also Internet Protocol Security.

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The most basic type of security for 802.11 wireless networks is Wired Equivalent Privacy, or WEP. WEP provides for authentication and data transmission security for wireless clients to protect against unauthorized access and eavesdropping. Unlike Windows XP and Windows Server 2003, Windows 2000 does not have integrated wireless network management features. In Windows XP and Windows Server 2003, you can configure the network key that is used for WEP. The key is used for authentication to the wireless network. In addition, the data encryption is enabled, which means a shared encryption key is generated to encrypt the data transmission between the computer and the wireless access point. In Windows 2000, 802.11 configuration must be done in the application provided by the wireless network interface vendor.