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BitArray moreBits = new BitArray(3); bits[0] = true; bits[1] = true; bits[2] = false; BitArray xorBits = bits.Xor(moreBits); foreach (bool bit in xorBits) { Console.WriteLine(bit); }

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Lesson 1: Building Recursive Queries with CTEs Lesson 2: Implementing Subqueries Lesson 3: Applying Ranking Functions

There are three different ways to configure ACLs:

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Import-CSV C:\IdentifyUsers.csv | ForEach-Object Process {Disable-Mailbox Identity $_.Identity} Import-CSV C:\IdentifyUsers.csv | ForEach-Object Process {Remove-Mailbox Identity $_.Identity}

Any system that enables multiple users to change data at the same time must implement a set of rules to ensure data consistency. SQL Server implements these rules by using shared and exclusive locks on rows, pages, and tables. When a piece of data is exclusively locked, no other process is allowed to read or modify that data, which inevitably causes blocking to occur as a normal state of operations. When blocks are retained for a significant amount of time, end users will begin to complain of slow performance. So it is critical to monitor the sys.dm_ exec_requests DMV to detect any processes producing excessive blocking. In extreme cases, you might have to terminate the process that is producing the excessive blocking. In addition to blocking, design flaws in applications can produce deadlocks. SQL Server will detect a deadlock and automatically select one process to terminate. Capturing a Locks\Deadlock Graph event in Profiler and using the information captured to make changes to the application is critical to ensure that your databases continue to operate without errors.

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In this exercise, you build a query that returns unique pairs of purchase orders that have the same vendor and shipping method. The report should not include the same pair of purchase order IDs more than once.

Templates\System\Ctrl+Alt+Del Options User Remove Change Configuration\Administrative Password Templates\System\Ctrl+Alt+Del Options User Remove Logoff Configuration\Administrative Templates\System\Ctrl+Alt+Del Options HKCU\Software\Microsoft\Windows\ CurrentVersion\Policies\System\DisableChangePassword

This chapter will also look at some tools in Windows XP Professional that help make your deployment of Windows XP Professional easier. These tools include the File and Transfer Wizard, the User State Migration Tool (USMT), and Windows Installer. Lessons in this :

Traditionally, a password is used to prove a user s identity on a network. A password is a form of a shared secret. The user knows his or her password, and the server authenticating the user either has the password stored, or has some information that can be used to validate the password. Passwords prove your identity because they are something you know. Presumably, only you know the password, and that knowledge proves who you are. Other ways to prove your identity are with something you have or something you are. Many modern computer systems authenticate users by reading information from a smart card something you have. Other computer systems are satisfied that you are who you claim to be only when you prove it with something you are. Biometrics is a form of authentication in which a unique part of your body is scanned, such as your fingerprint, your retina, or your facial features. Something you are is the most secure and reliable authentication method, because you cannot lose or forget it. However, it s also the least commonly used. Reliable biometric readers are too expensive to buy and maintain. Additionally, many users dislike biometric readers because they feel these readers violate their privacy.

Broadcast traffic, as you might recall from 7, Designing a WINS Structure, does not get forwarded by an IP router unless the router is configured to do so. This can be problematic if DHCP clients are located on a subnet that does not contain a DHCP server. See Figure 8-7.

Raise the forest functional level only when you are confident that you will not add new domains at unsupported domain functional levels. You cannot roll back to a previous forest functional level after raising it. Exam Tip

You are having a problem with excessive network traffic. You install Network Monitor on the server that seems most affected, a file server running Windows Server 2003. You want to obtain the source IP address, the destination IP address, and the destination port number of every inbound and outbound TCP/IP frame. You want to log the infor mation for a period of six hours. What do you do

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