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If you need a more powerful technique to narrow the suspicious region of the code, systematically remove parts of the program and see whether the error still occurs. If it doesn t, you know it s in the part you took away. If it does, you know it s in the part you ve kept. Rather than removing regions haphazardly, divide and conquer. Use a binary search algorithm to focus your search. Try to remove about half the code the first time. Determine the half the defect is in, and then divide that section. Again, determine which half contains the defect, and again, chop that section in half. Continue until you find the defect. If you use many small routines, you ll be able to chop out sections of code simply by commenting out calls to the routines. Otherwise, you can use comments or preprocessor commands to remove code. If you re using a debugger, you don t necessarily have to remove pieces of code. You can set a breakpoint partway through the program and check for the defect that way instead. If your debugger allows you to skip calls to routines, eliminate suspects by skipping the execution of certain routines and seeing whether the error still occurs. The process with a debugger is otherwise similar to the one in which pieces of a program are physically removed.

Installed the Domain Name System (DNS) subcomponent of the Networking Ser vices Windows component on Computer1. Once installed, the DNS server should host a primary forward lookup zone named domain1.local that is configured to accept dynamic updates. A host (A) resource record for both Computer1 and Computer2 should exist in the domain1.local zone. Promoted Computer1 to a domain controller (DC) in a new Active Directory domain and forest named domain1.local. Computer2 should be a member of the domain. After Active Directory is installed, the DNS zone domain1.local should be configured as an Active Directory integrated zone, and the zone should be configured to accept only secure dynamic updates. Created a dial-up connection to the Internet named MyISP on Computer1 that you have shared through Internet Connection Sharing (ICS). Computer2 should be receiving its Internet Protocol (IP) configuration from ICS. (If you are using a ded icated Internet connection instead of a dial-up account, you should apply this requirement to the dedicated line.) Installed Windows Support Tools on Computer1 and Computer2. Selected the Use This Connection s DNS Suffix In DNS Registration option on the DNS tab in the Advanced TCP/IP Settings dialog box for the Local Area Connec tion on Computer2 (Required for dynamic updates with ICS).

The most common tools used for troubleshooting DNS include Nslookup, the DNS Events log, and the DNS log. Nslookup is used to query DNS servers directly and to determine the contents of zones. The DNS Events log is a file accessible through Event Viewer to which errors and other events related to the DNS Server service are written. The DNS log, which is also called the DNS debug log or the DNS server log, is a sepa rate log maintained by the DNS server and configured on the Debug Logging tab of the DNS server properties dialog box. You can configure this log file to capture all DNS messages sent or received by the DNS server.

1. Click Start, click Run, and type certtmpl.msc to open Certificate Templates. 2. In the details pane, right-click the Authenticated Session template, and click Duplicate Template.

Be suspicious of classes and routines that have had defects before Classes that have had defects before are likely to continue to have defects. A class that has been troublesome in the past is more likely to contain a new defect than a class that has been defect-free. Re-examine error-prone classes and routines. Check code that s changed recently If you have a new error that s hard to diagnose, it s usually related to code that s changed recently. It could be in completely new code or in changes to old code. If you can t find a defect, run an old version of the program to see whether the error occurs. If it doesn t, you know the error s in the new version or is caused by an interaction with the new version. Scrutinize the differences between the old and new versions. Check the version control log to see what code has changed recently. If that s not possible, use a diff tool to compare changes in the old, working source code to the new, broken source code. Expand the suspicious region of the code It s easy to focus on a small section of code, sure that the defect must be in this section. If you don t find it in the section, consider the possibility that the defect isn t in the section. Expand the area of code you suspect, and then focus on pieces of it using the binary search technique described above.

Use the DNS Events log to review DNS errors and events Configure the DNS server to capture all packets to the Dns.log file Locate and open the Dns.log file