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Where protocols, such as remote procedure calls (RPCs), would require opening a wide range of ports, alternative solutions should be sought. Can the traffic be tunneled inside Secure Sockets Layer (SSL) or a more traditional VPN In general, protocols that require extensive use of secondary ports are ill-suited to traverse a firewall. Consider using an application-layer firewall that inspects traffic at the application layer to determine whether it is really what it appears to be. Thus, traffic of a mali cious nature that uses port 80 might be detected and blocked, while valid traffic will be allowed. Open ports for connection with a specific server or servers. Don t give unconditional access across a network. By following this rule, the risk engendered by the introduc tion of harmful traffic is reduced because only one or a few servers will be affected. Use a firewall capable of stateful inspection. Stateful inspection keeps track of the state (new request, response to previous traffic) of a connection and dynamically opens ports when necessary, rather than leaving them open.

) In Safe Mode, Windows ignores all startup programs as well, whether they re specified in a startup group on the All Programs menu or in the registry Note Unlike previous Windows versions, the base video driver in Windows XP will display 24-bit color in Safe Mode; the 640 x 480 resolution, however, cannot be adjusted In Safe Mode, you can access most essential configuration tools, including Device Manager, System Restore, Registry Editor, and Backup Utility Virtually all Help And Support Center features are available in Safe Mode as well, with the noteworthy exception of the Group Policy features in Advanced System Information You can use these tools to disable the system services, device drivers, or startup applications that are preventing your computer from starting If Windows appears to work properly in Safe Mode, you can safely assume that there s no problem with the basic services.

Use Device Manager, Driver Verifier Manager, and Event Viewer to try to figure out where the trouble lies If you suspect that a newly installed device or program is the cause of the problem, you can remove the offending software while you re running in Safe Mode Use Device Manager to uninstall or roll back a hardware driver; try the Add Or Remove Programs option in Control Panel to remove a program Then try restarting the system normally to see whether that resolved the problem..

Considerations for using packet-filtering routers include the following:

For more details about working with device drivers, see Managing Installed Drivers, page 152. For advice on the right way to remove a Windows program, see Uninstalling Programs, page 124.

Most routers are capable of performing packet filtering and were often used as the first firewalls. They are often used to specifically restrict traffic-only segments for performance reasons. They are effective border controls, but they do not offer the many additional fea tures that are present in modern firewalls and shouldn t be used instead of a firewall at a border between the private network and the Internet. A good use for these routers is to segment sensitive areas on the internal network. As with firewalls, care needs to be taken to prevent excessive opening of ports. They are often susceptible to Internet Protocol (IP) spoofing; they should not be relied on as the sole means of protection between networks.

You can safely get away with using the default settings for the Files And Settings Transfer Wizard if you satisfy the following conditions:

In the traditional sense, a proxy server simply proxies, or passes on, traffic from one party to another and serves as a way to expedite traffic across a gateway, not to inhibit it. Considerations for using proxy servers include the following:

2

If the partitioning scheme on the new computer is different from that on the old one, however, or if your data files are meticulously organized in folders other than My Documents, you should consider customizing the way the Files And Settings Transfer Wizard works. When you reach the What Do You Want To Transfer page on the old computer, select the options shown in Figure 2-9. Choose Both Files And Settings, and then select the Let Me Select A Custom List of Files check box.

Modern proxy servers serve as border controls. They might require authentication, and they might restrict access to resources for example, restricting a specific Microsoft Windows user group from accessing a range of Internet addresses, or preventing the download of specific file types.

Figure 2-9. Select this check box to tell the wizard you want to choose which files and settings are transferred.

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icacls c:\destination /deny Jeff_Phillips:(OI)(CI)W 3. Open the C:\Source directory in Windows Explorer. Right-click within the folder and create two new text files named Alpha and Beta. 4. Right-click Alpha and then choose Properties. Click the Security tab and then click the Research group. Verify that the permissions are assigned as shown in Figure 8-32. Perform the same actions on Beta.txt to verify that permissions are set identically.