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ICMP packets are a useful way to troubleshoot a network, however, so many administrators turn on ICMP, at least for the basic echo request used by ping. Also, any Windows Firewall setting that opens TCP port 445, such as enabling an exception for File and Printer Sharing, will automatically enable inbound echo requests.

22:

The available ICMP Message types are listed and described in Table 22-1.

occur with UDP, it has far less overhead than TCP. Several popular protocols and Internet services, including streaming multimedia, Internet telephony, DNS, and SNMP, are perfect matches for this service. UDP s inability to know when a packet hasn t been received and when to resend it explains the source of some of the dropped frames experienced in streaming video and sound dropouts encountered in streaming audio.

Table 22-1 ICMP Type Incoming Echo Request Incoming Timestamp Request Incoming Mask Request Incoming Router Request Outgoing Destination Unreachable Outgoing Source Quench Outgoing Parameter Problem Outgoing Time Exceeded Redirect Outgoing Packet Too Big

Description Messages sent to the computer are repeated back to the originator (ping). Data is acknowledged with the time the data was received. Requests for the network subnet mask of the computer are responded to. Requests for the network router address of the computer are responded to. Failure as a result of discarded packets is acknowledged with a destination unreachable message. When data is dropped because the computer can t receive it fast enough, the source is sent a message to slow down. When data is discarded because of a problematic header, the sender is notified with a bad header message. When a packet is discarded because the packet was too old, the sender is notified with a time expired message. Data sent from the computer can be rerouted if the default path changes. Applies to IPv6 only. If data blocks are too big for the computer, the sender is sent a packet too big message.

UDP has gained wide acceptance because the reliability of networking equipment that operates on the physical layer has greatly improved. This effectively minimizes the detrimental effects of UDP s inability to correct errors. Many protocols and applications that rely on UDP perform their own error detection/correction to make up for this behavior. This allows the application or protocol to take advantage of UDP s greater efficiency while minimizing its downside.

Windows XP SP2 adds important abilities to allow the administrator of Windows XP machines to deploy Windows Firewall settings uniformly and simply by using Group Policy, or by using scripts together with new features found in Netsh. Additionally, the settings can be deployed during initial installation or upgrade to Windows XP SP2 by using the Unattend.txt file or by using a custom Netfw.inf file for interactive installations from a central installation directory.

A good analogy is the new 2007 Microsoft Office system s document format that uses XML to describe the structure and formatting of your Word 2007 documents, for instance. XAML enables something that was really difficult previously: designers and developers working together on the same project. With Visual Studio and Microsoft Expression products such as Microsoft Expression Blend, designers can work on the design and user interface and then pass them on to the developers who can write the code. The video referenced previously is a good example of how these separate tasks can come together. Using XAML simply helps separate the front end, or user interface, from the back end, or business logic. I don t want to get too deep into XAML at this point because that s not the purpose of this book, but we ll start by looking at how XAML defines real .NET objects. Here s how a button is declared in XAML:

Group Policy is the preferred way to globally deploy Windows Firewall settings in an Active Directory environment; the new System.adm Administrative Template provided with Windows XP SP2 includes settings that allow you to control configuration of Windows Firewall. The first step in deploying Windows Firewall using Group Policy is to update your Group Policy objects with the new Windows Firewall settings. This requires that you first install Windows XP SP2 on a computer that is a member of the domain you want to update, and then use that computer to update the Group Policy objects for the domain.

Part III: