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The numbers you see throughout Windows Task Manager can provide useful general information about your system, but they can also mislead you. In some cases, the numbers are technically accurate, but don t actually provide meaningful information that you can use to solve performance problems. For instance, despite its name, the Page File Usage History graph actually indicates when space in the page file was committed or reserved, not when Windows began swapping data between physical memory and your hard disk. If you re planning to make changes on the basis of numbers you see here, be sure to test the effect of those changes carefully to ensure that the results are as you expect.

The most common reason a Windows system slows down is that you ve filled every bit of physical memory. When this happens, Windows begins a process called paging that is, moving blocks of program code and data files (each block is called a page) out of memory and onto disk. A modest amount of paging is perfectly normal, but excessive paging can take a terrible toll on overall system performance. This type of performance problem is especially noticeable when trying to switch between several memory-intensive programs on a computer that doesn t have enough RAM to keep up. The result is nearly nonstop thrashing as the disk tries in vain to shuffle data to and from the much faster memory chips. For a quick snapshot of current memory usage, open Windows Task Manager and examine the bottom of any tab. The statistic at the far right, Commit Charge, lists two numbers, presented as a fraction. The first number (the numerator) represents your current total commit charge the total amount of physical and virtual memory in use by all running processes. (Virtual memory is memory backed by your page file.) The second number (the denominator) represents your total available memory, physical and virtual. By itself, this number will

7

10

When the client sends data to the server, the tunnel client adds the tunnel protocol header to the packet and sends the data over the network to the VPN server. The server accepts the packet, removes the header, and sends it to its destination on the internal network. For a VPN connection to occur, both the client computer and the server computer must be using the same tunneling protocol. VPNs typically also add confidentiality (data encryption), authentication (endpoint-to-endpoint, user-to-central account database, or both), and integrity (protection from modification in transit). They can also add security features such as nonrepudiation (guaranteed to come from the identified source at a spe cific time) and protection from replay (packets or portions of packets cannot be reused).

Microsoft Windows XP Inside Out, Second Edition only tell you whether you re about to completely run out of memory in other words, when commit charge is nearly equal to available memory. To uncover more details about your current memory usage, click the Performance tab and look at the series of tables in the bottom half of the dialog box. Beware: The numbers and labels here can be absolutely baffling and can steer even an expert Windows user into the wrong conclusions. Table 14-1 explains how you can use this data to answer common questions about memory usage.

Windows Server 2003 can serve as an endpoint for two types of VPNs: remote access VPNs and site-to-site VPNs. The following sections describe these VPNs.

Table 10-1.