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addition, Windows XP Professional features intelligent processor throttling to reduce CPU power consumption. Windows XP Professional also provides more accurate estimates of remaining battery life. Processor performance control Windows XP Professional provides native support for processor performance control technologies such as Intel SpeedStep Technology, AMD PowerNow! , and Transmeta LongRun . Windows XP Professional also features an adaptive processor performance control algorithm that dynamically balances system performance and power consumption, based on the current CPU workload and remaining battery life. Battery and processor metrics Windows XP Professional displays information about processor performance and battery activity in System Monitor. The processor performance data available includes the current processor frequency and power consumption. Battery information provided includes the charge and discharge rates, voltage, and remaining capacity. Wake-on-critical battery Windows XP Professional supports wake-on-critical battery for portable computers that implement this feature. This allows a computer to awaken from standby when battery power becomes critically low and switch to hibernation to prevent data loss. Dynamic configuration of hot added devices When you insert and remove devices such as CardBus cards or Universal Serial Bus (USB) devices, Windows XP Professional detects and configures them without requiring you to restart the computer. Hot and cold docking or undocking With your portable computer fully powered, you can dock to a docking station and undock from a docking station without shutting down the computer. Table 7-1 lists the new or enhanced features in Windows XP Professional that support mobile users and indicates which of these features are available in Microsoft Windows 95, Microsoft Windows 98, Microsoft Windows NT Workstation 4.0, and Microsoft Windows 2000 Professional.

Table 7-1

2

Windows Firewall, introduced in Windows XP SP2, is a stateful firewall that drops incoming network traffic unless the traffic has been sent as the result of a request originating on the computer (solicited traffic) or has been explicitly allowed as the result of configuration settings (unsolicited excepted traffic). Windows Firewall supports setting configuration options globally for all connections or individually for specific connections. Unsolicited, excepted traffic can be specified by scope to limit it to specific subnets or applications, enabling a more granular control that allows known safe traffic while still protecting the system from unknown traffic.

Part III:

process called leasing. With DHCP leasing, a client requests IP configuration information, and the DHCP server allocates that client a particular IP address for a specified period of time, after which the client can release the address for other computers to use or renew the lease and continue to use it. In addition, DHCP servers can relate configuration data, such as preferred subnet masks and default gateways, as well as other information, such as DNS and WINS server addresses. For users on a small business or home network, however, the benefits of DHCP might not justify the costs of a dedicated DHCP server. This is where Automatic Private IP Addressing (APIPA) comes into play. APIPA is an automatic IP addressing service that enables a Windows XP computer to auto-assign an IP address when no DHCP server is available. APIPA is active by default on all Windows XP computers. If the Windows XP computer fails to find a DHCP server to provide addressing information, the computer selects an address from a special range of IP addresses (169.254.0.1 through 169.254.255.254). This range of addresses is not used on the Internet and normally cannot be accessed over the Internet. The purpose of these addresses is to isolate a private LAN s data from the world at large. Once the address is selected, the client checks the network to determine if another host is already using the address; if so, it selects another address and tries again until an unused address is found. APIPA provides a way for Windows XP computers to handle IP addressing so that users don t have to be involved. This allows home and small office networks the functionality of dynamic IP configuration without requiring the overhead of DHCP.