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Using an isolation level that s too restrictive results in the locking of resources. When many clients contend for the same resource, they must block until it s their turn. This leads to a natural bottleneck and scalability problem that results in both high latency and reduced overall throughput. So, how can we solve this concurrency problem One solution is to use the optimistic locking design pattern. Optimistic locking isn t locking in the traditional sense. Instead, we assume that no other client is trying to access the same data at the same time. Then, at transaction commit time, we let the database resolve whether the data has been altered by another transaction. If it has, we throw an exception and roll back our transaction. In other words, we are being optimistic that the data hasn t been touched until we need to commit. How does this work How does this avoid table-level locks Well, to use optimistic locking, we have to use a special feature of Java Persistence. The first thing we need to do is model our Account for use in the BankEJB:

This objective centers on configuration of the user s environment through GPOs. In configuring a user s environment, you will need to have the skills to identify and spec ify settings for the User Configuration node within GPOs. In the User Configuration node, you have the ability to perform the following tasks (as well as many others):

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Distribute software that users will have access to regardless of the computer that they are using. Assign user profiles and configure the desktop environment. Apply logon and logoff scripts, then configure whether they are hidden or visible, and whether scripts run sequentially or synchronously. Manage user certificates and enable autoenrollment. Restrict access to files in the Windows Systemroot, to icons on the desktop or in the Start menu, and to the Control Panel. Restrict the use of software, or force the use of a different application in place of Explorer.exe. Configure how the user will interact with Microsoft Windows components such as Internet Explorer and the Windows Installer. Establish security settings.

@Entity public class Account { ... /** * Current balance of the account */ private BigDecimal balance = new BigDecimal(0, new MathContext(2)); /** * Version used for optimistic locking */ @Version private Long version; ...

Read the scenario and then answer the question that follows. Scenario You re a security designer for Wingtip Toys, and you receive a proposal to change the security policy for Wingtip Toys, which includes the requirement that the LM authentication protocol be phased out. Review Question Answer the following question.

Distributing software provides for two options assigning of the application or pub lishing it. If you assign an application to a user, the user has the application installed and available after first logging on. If you publish an application, the user can use Add Or Remove Programs in Control Panel to install the application. Conflicts can occur between seemingly disconnected group policies. For example, the Disable Windows Installer policy can prevent a user from installing allowed applications that use the Windows Installer method, regardless of whether the software is published or assigned. Furthermore, if you publish an application and then restrict a user from accessing Control Panel or the Add Or Remove Programs icon, the user will not be able to install the application because the user cannot access the correct icon.

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1. Which Windows operating system clients absolutely must be upgraded to another operating system before LM can be eliminated from the network

Planning and Implementing Group Policy (4.0)

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In this activity, you must use what you ve learned in all three lessons and apply it to a real-world situation. Read the scenario, and then complete the exercise that follows. You can find answers for the exercise in the Questions and Answers section at the end of this chapter.

Autoenrollment of certificates can be done through Group Policy for users and com puters. When using autoenrollment, users do not need to be aware of the certificates that are enrolled, retrieved, or renewed. When you select autoenrollment behavior, you can establish a silent autoenrollment that requires zero user input. You can also require a user to provide input such as when users have smart cards and personal identification numbers (PINs). Folder redirection is a key to enabling easy access to data for users. When users log on to the network, they receive the Group Policy setting that tells the computer to point to a different location for certain information. This includes:

Application data information that configures an application for a specific person. Desktop the data that a person saves to the desktop. My Documents the information that a person would place in the My Documents folder on the desktop, or when saving data to My Documents. Start Menu the shortcuts and data icons that appear in the Windows Start menu.