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Two of the most common difficulties involved in multithread programming are the problems of deadlocks and race conditions. A deadlock occurs when one thread has exclusive access to a particular variable and then attempts to gain exclusive access to a second variable at the same time that a second thread has exclusive access to the sec ond variable and attempts to gain exclusive access to the variable that is locked by the first thread. The result is that both threads wait indefinitely for the other to release the variable, and they cease operating. A race condition occurs when two threads attempt to access the same variable at the same time. For example, consider two threads that access the same collection. The

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Case Scenario Exercise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-30

In addition to the top-level domains on the Internet, organizations can also have a pri vate namespace: a DNS namespace based on a private set of root servers independent of the Internet s DNS namespace. Within a private namespace, you can name and cre ate your own root server or servers and any subdomains as needed. Private names cannot be seen or resolved on the Internet. An example of a private domain name is mycompany.local.

When you add domain controllers to a forest, data from existing directory partitions are replicated to the new DC. In an environment with a large directory or where bandwidth is constrained between a new DC and a writable DC from which to replicate, you can install AD DS more efficiently by using the IFM option. Installing from media involves creating installation media a specialized backup of Active Directory that can be used by the Active Directory Domain Services Installation Wizard as a data source for populating the directory on a new DC. Then the new DC will replicate only updates from another writable DC, so if the installation media is recent, you can minimize the impact of replication to a new DC. Remember that it is not only the directory that must be replicated to a new DC but SYSVOL as well. When you create your installation media, you can specify whether to include SYSVOL on the installation media. Using IFM also enables you to control the timing of impact to your network bandwidth. You can, for example, create installation media and transfer it to a remote site during off hours, then create the domain controller during normal business hours. Because the installation media is from the local site, impact to the network is reduced, and only updates will be replicated over the link to the remote site. To create installation media, open a command prompt on a writable domain controller, running Windows Server 2008. The installation media is compatible across platforms. Run Ntdsutil.exe and then, at the ntdsutil prompt, type the activate instance ntds command and then the ifm command. At the ifm: prompt, type one of the following commands, based on the type of installation media you want to create:

Client Host Name This column displays the name or IP address of the client host computer. The client name is only displayed for Firewall Clients, and the IP address is displayed for SecureNAT.

Figure 5-2

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You are providing telephone support at a help desk when a caller contacts you want ing to add several pieces of new hardware to her computer. While talking to the user, you determine that some of the hardware is completely new to the computer, and other pieces are upgrades to what she currently has installed. What can you do to help her get the hardware installed As a DST, you must be familiar with the operation of various types of I/O devices and the procedures used to troubleshoot them when they fail. Often, Windows XP identi fies a class of hardware and installs generic drivers, which make only basic features available to the user. To take advantage of the advanced features that may be available with many devices, you must install the proper hardware drivers (and sometimes software applications bundled with the hardware).