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for ( i = 2; i <= num / 2; i++ ) { j = i + i; while ( j <= num ) { meetsCriteria[ j ] = False; j = j + i; } } for ( i = 1; i <= num; i++ ) { if ( meetsCriteria[ i ] ) { System.out.println ( i + " meets criteria." ); } }

You can gather a wide range of troubleshooting information by using Klist.exe and Kerb tray.exe. For example, you can determine whether a ticket is valid, whether Kerberos was used, and if so, whether Kerberos was used to attempt to authenticate a domain. Using Netdiag to Verify Kerberos Health After you are familiar with Kerberos process ing and the records in Network Monitor, the Security Event log, Kerbtray.exe, and Klist.exe, how can you best monitor Kerberos You can t spend hours every day ensur ing that all is in order. The trick, of course, is not to examine the thousands perhaps millions of records every day, but to look for warnings that might mean a Kerberos problem when viewing the logs and captures. You can use Netdiag to get a quick read ing of Kerberos health on a server. Netdiag runs a large number of tests, and one of them is the Kerberos test. If you run Netdiag from the command line, a minimal amount of information will provide the results of the Kerberos test. If something is wrong, it is reported. Running the specific test and using the /v switch for verbose, or /debug for more information, provides a list of tickets, an authentication test, domain information, and so on. Use the following statement to print this information to a file.

SET USERNAME=%5

What do you think this routine does It s unnecessarily cryptic. It s poorly documented not because it lacks comments, but because it lacks good programming style. The variable names are uninformative, and the layout is crude. Here s the same code improved just improving the programming style makes its meaning much clearer:

Figure 11-21 shows the results of a normal Kerberos test, and Figure 11-22 shows the results of a failed test.

Figure 11-21

In this code, the variable FactorableNumber is added solely for the sake of clarifying the operation. For details on adding variables to clarify operations, see "Making Complicated Expressions Simple" in Section 19.1.

Monitoring Network Protocol Security 11-51

:VALIDATION @rem *** @rem * Check whether files can be copied. @rem * echo Checking for %SOURCE_FILE% if exist %SOURCE_FILE% goto REMOVE_QUARANTINE @rem *** @rem * PING the resource to ensure that it is available @rem * before attempting to access it. (This also helps @rem * in case of any network delays.) @rem * ping ca1.example.com -n 20 -a if exist %TARGET_FILE% goto COPY_FILE_TO_LOCAL goto FILE_NOT_FOUND :FILE_NOT_FOUND @rem *** @rem * File specified in TARGET_FILE could not be detected. @rem * echo Unable to locate %TARGET_FILE% goto EXIT_SCRIPT :COPY_FILE_TO_LOCAL @rem *** @rem * The file does not exist on the local computer. The file wil l now be copied @rem * from the server, and the program will exit (leaving the use r in quarantine). @rem * echo Copying %TARGET_FILE% to %SOURCE_FILE% copy %TARGET_FILE% %SOURCE_FILE% goto SHOWQUARANTINEINFO :REMOVE_QUARANTINE @rem *** @rem * The file exists on the local computer. The client now must be removed from @rem * quarantine. @rem * Also, to demonstrate how the script works, echo @rem * the executable, and pause for test review before opening th e @rem * Web site. Do not echo or pause in a production script. echo %SOURCE_FILE% found! echo Executing %RQCLOC% %CONNNAME% %TUNNELCONNNAME% %PORT% %DOMAIN

Figure 11-22

Java Example of Documentation Without Comments (with Good Style)

In this practice, you use the IP Security Management snap-in and the Netsh command to manage IP security Policy.

You can access IP security through a GPO, through the Local Security Policy console on Windows Server 2003, Windows 2000, and Windows XP Professional, and by load ing IP Security Monitor snap-in in a console. To simplify monitoring of policy activity, in this exercise, you load the tool in the MMC and save the console for later use. The first policy you create is a blocking policy, which is useful in keeping unwanted traffic from being received on specific computers.