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When a Microsoft Windows XP computer with a wireless network adapter starts up, or when the wireless adapter is enabled if it has been disabled, it automatically actively scans the wireless frequencies it supports for wireless access points or other wireless clients. If it finds a Service Set Identifier (SSID) that is on its preferred list of wireless networks, and it is configured for automatic connection, it will negotiate a wireless port with the access point, creating an association. If the signal strength is low or the error rate is high, the wireless client will scan for other wireless access points, looking for a stronger signal. If it finds another access point on the same network that can provide a better signal, it can negotiate a new association with that access point. This is known as reassociation. As a wireless client moves about within the range of a wireless network, it can associate and reassociate with the available wireless access points with no change in IP address or configuration. Windows XP will interpret the reassociation as a media disconnect/connect event, causing Windows XP to perform a DHCP renewal. If the reassociation is with an access point on the same subnet and with the same SSID, there will be no change in IP address and the process will be completely transparent to the user. If, however, it is no longer able to associate with a wireless access point with the same SSID or on the same subnet, it will reassociate with the new access point but will get a new IP address that is valid in the context of the new association.

a server that polls all the devices on the network and literally asks them if they have anything to transmit. When a host replies with a positive acknowledgment, the polling computer authorizes the transmission. A computer on a polling network cannot transmit unless given permission by the central authority, and the computer must wait for its turn in the polling cycle before it can request such permission.

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private void tstbUrl_KeyUp(object sender, KeyEventArgs e) { // e is of type KeyEventArgs and contains all the // information that triggered the event. The KeyCode // is part of that information. if (e.KeyCode == Keys.Enter) this.NavigateToUrl(tstbUrl.Text); } private void NavigateToUrl(string Url) { myBrowser.Navigate(Url); }

When no access point is available, wireless clients can communicate directly with each other in ad hoc mode, as shown in Figure 21-3. Ad hoc mode is sometimes referred to as peer-to-peer mode.

Figure 21-3

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The first client in an ad hoc mode network performs some of the roles of an access point, including periodic broadcast of the SSID and the authentication of new members to the ad hoc network. The client does not, however, act as a bridge between the wireless network and a wired network. Wireless clients must be explicitly configured to use ad hoc mode, and there are a maximum of nine clients in an ad hoc wireless network.

Wireless network adapters must be explicitly written to support the enhanced features of Windows XP. These features include the Wireless Zero Configuration (WZC) Service and automatic roaming.

Microsoft Windows XP Service Pack 2 adds a number of enhancements to the wireless networking support in Windows XP. These enhancements include:

The network components that exist at the physical layer have only one function: generating signals along the physical cabling and interfaces on the network. Although there are a variety of methods for generating signals on the network, both analog and digital, the goal is the same: Each method seeks to transmit binary data. The actual devices that exist at the physical layer consist of cables (or wireless connections using radio waves or infrared light), plugs connected to the cabling, and the receiver jacks along with the signaling equipment attached to network adapters (or transmitter/receiver devices for wireless communications).

Built-in support for WPA Wireless Provisioning Service Wireless Network Setup Wizard Wireless Zero Configuration Service logging Improved Repair functionality for wireless connections Wireless Network Connection Dialog Box

Part III:

The enhanced support for wireless networking listed here has resulted in a number of changes and enhancements to various dialog boxes and properties pages. A full review of the changes can be found at http://www.microsoft.com/technet/community /columns/cableguy/cg0804.mspx

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Support for WPA was originally added to Windows XP as a security update after Service Pack 1 was released, as described in Knowledge Base Article 815485. With the release of Service Pack 2, the support for WPA was integrated into Windows XP and you can now use the Wireless Network Setup Wizard to enable WPA. When Windows XP detects that a wireless access point is configured for WPA encryption, the Wireless Network Connection dialog box will identify the access point as a Security Enabled Wireless Network (WPA) as shown in Figure 21-4.

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Figure 21-4 The Wireless Network Connection dialog box, with WPA, WEP, and unsecured wireless networks showing