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The complexity involved in configuring a large number of available security settings could make security administration impossibly complex. Fortunately, you do not have to start from scratch. Security templates are available that allow you to set up various standard levels of security. You can also analyze a custom security setting by compar ing it against standard templates. Security is always a balance. There is no point in setting up policies on your servers so strict that many of your users, particularly those with legacy client operating systems, cannot access the resources or run the software that they require to do their jobs. However, if security settings do become too restric tive, tools such as Resultant Set Of Policy allow you to quickly identify the source of the problem. The 70-291 examination does not require you to know how to design security systems. You do, however, need to know how to audit systems using security templates, and how to implement predefined security settings for software and security updates. You need to be able to check that security configurations are working correctly, and to troubleshoot them if they are not. You also need to be able to access and analyze secu rity statistics. Finally, you need to be aware that security must present a moving target. What is secure today might not be secure tomorrow, and breached security is usually worse than no security at all.

The skills that you need to successfully master the Implementing, Managing, and Main taining Network Security objective domain on the 70-291 exam include the following:

Isolate pointer operations in routines or classes Suppose you use a linked list in several places in a program. Rather than traversing the list manually each place it s used, write access routines such as NextLink(), PreviousLink(), InsertLink(), and DeleteLink(). By minimizing the number of places in which pointers are accessed, you minimize the possibility of making careless mistakes that spread throughout your program and take forever to find. Because the code is then relatively independent of data-implementation details, you also improve the chance that you can reuse it in other programs. Writing routines for pointer allocation is another way to centralize control over your data. Declare and define pointers at the same time Assigning a variable its initial value close to where it is declared is generally good programming practice, and it s all the more valuable when working with pointers. Here is an example of what not to do:

Practice 1: Create a security management tool by adding the Security Configuration And Analysis snap-in and the Security Templates snap-in to the Microsoft Management Console (MMC). Practice 2: Use the security management tool that you created in Practice 1 to create a new database. Import a security template and analyze security. Do not use the default log; instead, specify a log file. Analyze the system security against several security templates. Practice 3: Use the Secedit command-line utility to perform the same task for which you used the MMC in Practice 2. Practice 4: Carry out a security analysis using the MMC and Secedit as before, but use the Runas command while logged on with an ordinary user account. Practice 5: Define a new security template. Export the template and apply it to a PC other than the one on which you defined it.

The first step in deploying your VPN routers is determining where to place them in relation to your Internet firewall. In the most common configuration, the VPN routers are placed behind the firewall on the perimeter network between your site and the Internet. If you are using Microsoft Internet Security And Acceleration (ISA) Server as your firewall, Microsoft VPN services are part of the ISA product and you should be aware of the subtle differences from the standard Windows Server 2003 setup. Refer to the specific ISA server documentation to learn about the differences. One feature of ISA Server is that it automatically sets up the proper firewall filters for VPN traffic in the firewall rules. If you are using a non-ISA firewall, you will need to configure packet filters on the firewall to allow for either L2TP/IPSec or PPTP traffic (as appropriate) to and from the IP address of the VPN routers perimeter network interfaces. For more information, see Appendix B, Configuring Firewalls for VPN.

Implementing, Managing, and Maintaining Network Security (3.0)

Employee *employeePtr; // lots of code ... employeePtr = new Employee;

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Practice 1: Access Checklist: Securing Computers Using Security Configura tion Manager in the Windows Server 2003 Help And Support Center. Work through the Preparing to Set Up Security and the Modifying Security Set tings procedures. Pay particular attention to the Microsoft Windows Logo Program for Software, and research this topic on the Microsoft Web site (http://www.microsoft.com). Practice 2: Install and configure Windows Update by accessing the Windows Update home page from the Microsoft Web site, and clicking Personalize Windows Update. Select the Display The Link To The Windows Update Cat alog Under See Also check box, and click Save Settings. Ensure that you receive security updates. Practice 3: Install and configure Microsoft Software Update Services (SUS) on a server running a member of the Windows Server 2003 family on your network. Practice 4: Configure Windows Update (SUS client) on a client PC to receive Windows patches and updates from the SUS server.

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If even this code works correctly initially, it is error prone under modification because there is a chance that someone will try to use employeePtr between the point where the pointer is declared and the time it s initialized. Here s a safer approach: