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through code line by line, stepping through or over routines. They allow the program to be executed backwards, stepping back to the point where a defect originated. They allow you to log the execution of specific statements similar to scattering I m here! print statements throughout a program. Good debuggers allow full examination of data, including structured and dynamically allocated data. They make it easy to view the contents of a linked list of pointers or a dynamically allocated array. They re intelligent about userdefined data types. They allow you to make ad hoc queries about data, assign new values, and continue program execution. You can look at the high-level language or the assembly language generated by your compiler. If you re using several languages, the debugger automatically displays the correct language for each section of code. You can look at a chain of calls to routines and quickly view the source code of any routine. You can change parameters to a program within the debugger environment. The best of today s debuggers also remember debugging parameters (breakpoints, variables being watched, and so on) for each individual program so that you don t have to re-create them for each program you debug. System debuggers operate at the systems level rather than the applications level so that they don t interfere with the execution of the program being debugged. They re essential when you are debugging programs that are sensitive to timing or the amount of memory available.

In this exercise, you verify that new SRV resource records have been added to the domain1.local zone. 1. From Computer1, log on to Domain1 as Administrator. Use the same password that you originally assigned to the Computer1 Administrator account. 2. If you see the final page in the Configure Your Server Wizard, indicating that the server is now a domain controller, click Finish. 3. Open the DNS console. Expand the COMPUTER1, Forward Lookup Zones, and the Domain1.local nodes. Six subdomains are now listed under Domain1.local. They have been created by the installation of Active Directory. 4. In the DNS console tree, browse to locate an SRV resource record named _ldap._tcp.dc._msdcs.domain1.local. To perform this task, read each label in the name of the resource record from right to left, starting with the Domain1.local node. For example, once you have opened the _msdcs.domain1.local node, open the Dc node, and finally the _tcp node. You see the _ldap service location (SRV) resource record in the details pane when the _tcp node is selected, as shown in Figure 5-12.

5-17

An interactive debugger is an outstanding example of what is not needed it encourages trial-and-error hacking rather than systematic design, and also hides marginal people barely qualified for precision programming. Harlan Mills

Figure 5-12

This appendix provides an example with detailed information about how you can use five computers, running only Microsoft Windows Server 2003 and Windows XP Professional, in a test lab environment to configure and test a Point-to-Point Tun neling Protocol (PPTP) based site-to-site virtual private network (VPN) connection. You can use this example deployment to learn about Windows Server 2003 site-tosite VPN functionality before you deploy a site-to-site VPN connection in a produc tion environment. This test lab configuration simulates a deployment of a PPTPbased site-to-site VPN connection between the Seattle and New York offices of an organization. Note The following instructions are for configuring a test lab using a minimum number of computers. Individual computers are needed to separate the ser vices provided on the network and to clearly show the functionality. This configu ration is neither designed to reflect best practices nor is it recommended for a production network. The configuration, including IP addresses and all other configuration parameters, is designed only to work on a separate test lab network.

This resource record is used to locate domain controllers for the domain1.local domain. It is the most important record to check after you have installed Active Directory. 5. In the DNS console tree, browse to locate an SRV resource record named _ldap._tcp.gc._msdcs.domain1.local. This resource record is used to locate Active Directory global catalogs for the domain1.local domain. The records have been created successfully. 6. Log off Computer1.

Given the enormous power offered by modern debuggers, you might be surprised that anyone would criticize them. But some of the most respected people in computer science recommend not using them. They recommend using your brain and avoiding debugging tools altogether. Their argument is that debugging tools are a crutch and that you find problems faster by thinking about them than by relying on tools. They argue that you, rather than the debugger, should mentally execute the program to flush out defects. Regardless of the empirical evidence, the basic argument against debuggers isn t valid. The fact that a tool can be misused doesn t imply that it should be rejected. You wouldn t avoid taking aspirin merely because it s possible to overdose. You wouldn t avoid mowing your lawn with a power mower just because it s possible to cut yourself. Any other powerful tool can be used or abused, and so can a debugger. The debugger isn t a substitute for good thinking. But, in some cases, thinking isn t a substitute for a good debugger either. The most effective combination is good thinking and a good debugger.

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If you simply want to view a list of all SRV resource records in a domain and do not need to make subsequent queries, you can perform steps 15 and 16 as one step by typing the command ls t srv domain1.local at the Nslookup prompt.