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Correct Answers: D A. Incorrect: Fast User Switching allows users to switch from one logon account to another without either user having to log out. It is available only in workgroups, not in a domain environment. B. Incorrect: Fast User Switching allows users to change from one logon account to another without either user having to log out. It is available only in workgroups, not in a domain environment. C. Incorrect: Fast User Switching is available only in workgroups, not in a domain environment. D. Correct: Fast User Switching allows multiple users to log on to a workstation simultaneously and for the users to change back and forth without losing any information or having to log out. This is implemented through the Windows XP Welcome screen, which is not available in a domain environment.
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Correct Answers: A A. Correct: This opens the Wireless Network Connections window, which shows you available wireless networks and their current status. You can also configure wireless network keys from this window. B. Incorrect: Ipconfig /all does not display any information about wireless networks. C. Incorrect: Device Manager does allow you to configure some aspects of a wireless network adapter, such as advanced wireless settings. However, it does not enable you to view current or available wireless connections. D. Incorrect: Windows XP uses the Wireless Zero Configuration service to automat ically connect to available networks. However, you cannot use the Services console to configure wireless networks. Instead, you should use the View Wireless Connections dialog box.
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Designing Database Server Security Policies . . . . . . . . . . . . . . . . . . . . . 125
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Practice: Configure Internet Explorer . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19
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Many applications install software that runs in the background as you use Windows. Normally, this software is a useful piece of the application, such as the monitor that allows your antivirus software to check files for viruses during download. Often, this software is a program that you could easily live without. When this is the case, it is best to prevent the software from loading with Windows so that the software does not con sume system resources. You can sometimes tell what background programs are running because the programs are represented by icons in the notification area, but this is not always the case. Even if there is an icon present, turning off different programs usually requires different steps, depending on the program. To prevent unnecessary background applications from running, try the following:
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Instead of Unicode text, version 4 files are ANSI text files. That means that each character is a single byte wide. The letter A is 0x41. You notice the difference between this and the earlier Unicode REG file in the Expandable String and MultiString values. Characters in REG_EXPAND_SZ and REG_MULTI_SZ values are single bytes, which is more natural for most folks. This is the file format that's compatible with programs expecting ANSI REG files, and it has the added benefit of being compatible with earlier versions of Regedit. Choosing Between REG and Hive Files Registry Editor exports branches to four different file formats. Each format has strengths and weaknesses that make it appropriate for some tasks and useless for others. This section should help you choose the right format each time. Exporting to hive files is my choice most of the time. The reason I like hive files so much is because they're much more accurate than either type of REG file. They are the same format as the Windows XP working hive files, so they represent settings exactly the same way. Also, when you import a hive file, Registry Editor deletes the branch it's replacing before importing the settings. In other words, the editor removes any settings that exist in the working registry but not in the hive file you're importing. When restoring keys from a backup after an unsuccessful registry edit, this is exactly the behavior you want. Hive files have one more strength that make them my choice most of the time: You can load them as new hives and view their contents without affecting other parts of the registry. Their only drawback is you can't view them in Notepad. Although hive files are my choice most of the time, there are a few scenarios that require me to use REG files. First is when I'm working with programs that don't understand hive files. For example, the Office XP Resource Kit's Custom Installation Wizard can read REG files but not hive files. Second is when I'm exporting settings to different versions of Windows. Windows 98 doesn't provide a way to load hive files. Last, and important in my view, is when I'm trying to track down a setting in the registry by comparing snapshots. Comparing two hive files isn't feasible, but comparing two REG files is easy using Microsoft Word 2002.
' Edit column values by passing the column index
Objective 3.2: Design code that detects and reacts to errors
Lesson 1: Upgrading and Migrating to Windows Vista
Correct Answers: B and E A. Incorrect: CARP becomes available when you enable caching on any ISA Server 2004 Enterprise Edition computer in an array. B. Correct: CARP is enabled at the array level rather than the individual server level. C. Incorrect: CARP is enabled at the array level rather than at the individual server level. You cannot enable CARP at the individual server level. D. Incorrect: CARP is enabled at the array level and cannot be enabled at the enterprise level. E. Correct: CARP can be enabled at the array level once caching is enabled on any single server within the array.
Indexing Service
Create and implement a maintenance strategy for database servers.
' VB Public Shared Sub HandleCallback( _ ByVal result As IAsyncResult) Dim proxy As OrderEntryServiceClient proxy = result.AsyncState Dim ack As OrderAcknowledgement ack = proxy.EndSubmitOrder(result) Console.WriteLine( _ "Order submitted; tracking number: {0}", _ ack.TrackingNumber) End Sub // C# static void HandleCallback(IAsyncResult result) { OrderEntryServiceClient proxy = result.AsyncState as OrderEntryServiceClient; OrderAcknowledgement ack = proxy.EndSumbitOrder(result); Console.WriteLine( "Order submitted; tracking number: {0}", ack.TrackingNumber); }
It is a good idea to analyze storage requirements carefully before configuring the disk subsystem of a server. Administrators typically elect to install the operating system on a logical volume separate from applications and data. By isolating the operating system, it is easier to secure the operating system volume and to manage disk utilization so that the volume does not run out of space. It is also usual to configure some kind of fault tolerance for the operating system. Applications are generally stored in a separate volume and user data and files in a third. Again, isolation of data types allows you to manage security, performance, and fault tolerance separately for each data type. If an application uses a transaction log to prepare entries into a database, as do Active Directory directory service and Microsoft Exchange Server, it is typical to store those logs in volumes that reside on physical disks separate from the database itself, allowing the application to rebuild the database from the logs if the database fails. Once you have thoroughly analyzed your storage requirements as they relate to the data type, security, performance, and fault tolerance, you can begin to determine how many disks you require and how those disks should be configured.
Connecting to a Network
The identity of a recipient or sender as well as verification that a transmission has not been tampered with can be accomplished through digital signatures. The process of obscuring a message so that unauthorized parties cannot view it is known as encryption. Digital signatures and encrypted messages can be used separately, but used together they provide a very powerful framework for secur ing data. The process of taking an encrypted message and making it readable is known as decryption. To prevent unauthorized parties from viewing the contents of a message, a mes sage must be encrypted. By default, WSE 3.0 encryption only encrypts the body part of the message. If sensitive data is contained in the message outside of the body, it will be accessi ble to unauthorized third parties unless it too is encrypted. Symmetric encryption algorithms, also known as private key algorithms, neces sitate both the sender and the recipient having access to the same private key. Because this key must be distributed to at least two parties to be useful, symmet ric algorithms are generally considered less secure than their asymmetric coun terparts. Asymmetric algorithms, also known as public key algorithms, only require the sender to have access to a public key. The sender uses this public key to encrypt messages that can only be decrypted by someone with access to its matching pri vate key.
In the ValidationError event handler, we can save the XML file as is instead of process ing it and add it to a queue of items that must be hand-examined.
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