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In this exercise, you configure Account Lockout Policy settings, and then test them to make sure they are set up correctly. 1. Log on to your computer with a user account that is a member of the Administrators group. 2. Click Start, and then click Control Panel. 3. In the Control Panel window, click Performance And Maintenance. 4. In the Performance And Maintenance window, click Administrative Tools. 5. In the Administrative Tools window, double-click Local Security Policy. 6. In the Local Security Settings window, expand Account Policies, and then click Account Lockout Policy. 7. Use Account Lockout Policy settings to do the following:

The Command interface has an execute() method; any concrete command must implement this method. Any subinterface may add additional methods that are called before (setters) or after (getter) the Command is executed. A Command is therefore combining input, controller, and output for a particular event. Executing Command objects that is, calling their execute() method is the job of a CommandHandler implementation. Execution of commands is dispatched polymorphically. The implementation of these interfaces (and abstract classes) can look as follows:

Lock out a user account after four failed logon attempts. Lock out user accounts until an administrator unlocks the user account.

If a Suggested Value Changes dialog box appears, click OK, and then verify that your settings are correct.

public interface Command { public void execute() throws CommandException; }

9. Log off Windows XP Professional. 10. Try to log on as User13 with a password of chocolate four times. 11. Try to log on as User13 with a password of chocolate again and a dialog box appears, indicating that the account is locked out. 12. Click OK, and then log on as a user that is a member of the Administrators group.

Configuring Account Policies 16-23

Commands also encapsulate exception handling, so that any exception thrown during execution is wrapped in a CommandException that can then be handled accordingly by the client. The DataAccessCommand is an abstract class:

The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. What is the range of values Windows XP Professional allows you to set for the Enforce Password History setting, and what do those values mean

2. The range of values Windows XP Professional allows you to set for the Maximum Password Age setting is ______ to ______ days. The default value is ______ days. 3. Which of the following selections are requirements for a password if the Passwords Must Meet Complexity Requirements setting is enabled (Choose all that apply.) a. All passwords must exceed six characters in length. b. All passwords must comply with the password history settings. c. No passwords can contain capitals or punctuation. d. No passwords can contain the user s account or full name. 4. What is Account Lockout Duration, and what is the range of values

public abstract class DataAccessCommand implements Command { protected DAOFactory daoFactory; public void setDAOFactory(DAOFactory daoFactory) { this.daoFactory = daoFactory; } }

Password Policy allows you to manage the passwords used on your computer. For example, you can force users to change passwords on a regular basis and you can control the minimum length of a password. Account Lockout Policy allows you determine the number of invalid logon attempts before a user account is locked out of the computer.

Before he can make any modifications to the image, Harold must mount it to a folder. Windows 7 is a language-neutral operating system, so Harold must install a language pack to provide the image with support for the French user interface. After installing the language pack, Harold must reset the default user interface from English to French. After modifying the mounted image files, Harold must commit the changes he has made to the Windows Imaging file. Having modified the image and committed the changes, Harold must dismount the image before he can deploy it to the workstations.

Any Command that needs to access the database must use a data-access object, so a DAOFactory must be set before a DataAccessCommand can be executed. This is usually the job of the CommandHandler implementation, because the persistence layer is on the server tier. The remote interface of the command handler is equally simple:

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public interface CommandHandler { public Command executeCommand(Command c) throws CommandException; public DataAccessCommand executeCommand(DataAccessCommand c) throws CommandException; public Reportcommand executeCommand(ReportCommand c) throws CommandException; }