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Take a break from the problem Sometimes you concentrate so hard you can t think. How many times have you paused for a cup of coffee and figured out the problem on your way to the coffee machine Or in the middle of lunch Or on the way home Or in the shower the next morning If you re debugging and making no progress, once you ve tried all the options, let it rest. Go for a walk. Work on something else. Go home for the day. Let your subconscious mind tease a solution out of the problem.

1. Click Start, point to Administrative Tools, and click Certification Authority. 2. Double-click Example CA to open it. Right-click Certificate Templates, point to New, and click Certificate Template To Issue. 3. In the Enable Certificate Templates dialog box, hold down the Ctrl key and click Authenticated Session For WebEnroll and RAS And IAS Server. Release the Ctrl key, and click OK.

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The auxiliary benefit of giving up temporarily is that it reduces the anxiety associated with debugging. The onset of anxiety is a clear sign that it s time to take a break.

1. You have just updated a host resource record. What other associated resource record might now need to be updated

1. Open the Active Directory Users And Computers administrative tool. 2. In the console tree, right-click the example.com domain, and then click Properties. 3. On the Group Policy tab, click Default Domain Policy and then click Edit.

2. Your DNS server has failed the recursive test. Assuming that the server can otherwise communicate with other DNS servers, name two potential causes of this sce nario.

Brute force is an often-overlooked approach to debugging software problems. By brute force, I m referring to a technique that might be tedious, arduous, and time-consuming, but that it is guaranteed to solve the problem. Which specific

The DNS server has been configured as a root server, or the root hints file is improperly config ured.

techniques are guaranteed to solve a problem are context dependent, but here are some general candidates: Perform a full design and/or code review on the broken code Throw away the section of code and redesign/recode it from scratch Throw away the whole program and redesign/recode it from scratch Compile code with full debugging information Compile code at pickiest warning level and fix all the picky compiler warnings Strap on a unit test harness and test the new code in isolation Create an automated test suite and run it all night Step through a big loop in the debugger manually until you get to the error condition Instrument the code with print, display, or other logging statements Replicate the end-user s full machine configuration Integrate new code in small pieces, fully testing each piece as its integrated

3. Which resource record is used to resolve domain names specified in e-mail addresses to the IP address of the mail server associated with the domain a. PTR b. MX c. A d. CNAME

4. In the console tree for Group Policy Object Editor, open Computer Configu ration, then Windows Settings, and then Security Settings. Click Public Key Policies. 5. In the details pane, right-click Autoenrollment Settings, and click Properties. Select Enroll Certificates Automatically, and select both check boxes. Click OK.

4. On a new DNS server, you create a zone and then create subdomains from that root domain. Which function will the new server be able or unable to perform a. The server will be unable to cache names. b. The server will be able to function only as a forwarding server. c. The server will be unable to resolve Internet names. d. The server will be unable to connect to the Internet.

Set a maximum time for quick and dirty debugging For each brute force technique, your reaction might very well be, I can t do that; it s too much work! The point is that it s only too much work if it takes more time than what I call quick and dirty debugging. It s always tempting to try for a quick guess rather than systematically instrumenting the code and giving the defect no place to hide. The gambler in each of us would rather use a risky approach that might find the defect in five minutes than the surefire approach that will find the defect in half an hour. The risk is that, if the fiveminute approach doesn t work, you get stubborn. Finding the defect the easy way becomes a matter of principle, and hours pass unproductively, as do days, weeks, months, ... How often have you spent two hours debugging code that took only 30 minutes to write That s a bad distribution of labor, and you would have been better off simply to rewrite the code than to debug bad code.

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