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5, Implementing Role-Based Security, taught how to add RBS demands to your application to cause the .NET Framework to throw an exception when the user did not meet your security requirements. Like RBS demands, CAS can also be used either imperatively or declaratively. However, CAS demands authorize the calling code, not the user. CAS demands are used to verify that the assembly that calls your assembly, method, or class has the necessary CAS permissions before the .NET Framework runtime runs your code. This lesson teaches how and why to use both imperative and declarative CAS demands.

You can often aggregate data stored in tables within a database to produce important types of business information. For instance, you might not be interested in a list of employees in the database but instead want to know the average salary for all the employees. You perform this type of calculation by using aggregate functions. Aggregate functions operate on groups of rows rather than individual rows; the aggregate function processes a group of rows to produce a single output value. Transact-SQL has several built-in aggregate functions, and you can also define aggregate functions by using Microsoft .NET languages. Table 5-1 lists commonly used built-in aggregate functions and what they do.

Local A local user profile is available only on the system on which it was created. A unique local user profile is created and stored on each computer that a user logs on to. Roaming Roaming profiles, which are stored in a shared folder on a network server, are accessible from any location in the network. Mandatory Mandatory user profiles are roaming user profiles that users cannot make permanent changes to. Mandatory profiles are used to enforce configuration settings.

Wired networks normally require a physical connection in order to be compromised. In wireless networks, because the data is broadcast using radio, intruders can intercept the signals. If those signals are not encrypted, intruders can view the data being transmitted. Wired Equivalent Privacy (WEP) is one of two wireless encryption standards supported by Windows XP Professional (the other being Wi-Fi Protected Access, which is covered in the next section). WEP is the encryption standard that is specified by the IEEE 802.11 standard. WEP provides encryption services to protect authorized users of a wireless LAN from eavesdroppers. WEP functions by using a shared key to encrypt packets of data before transmitting them over a wireless network. This shared key is generated by using 40-bit or 64-bit secret key encryption, and then adding a 24-bit initialization vector (IV) to the end of that key. The shared key is set in place for a network, but a new IV is generated randomly for each packet of data that is transmitted over the network. Unfortunately, WEP is not as strong as its designers had hoped. There are two basic shortcomings in the standard WEP protocol:

Digital Content for Digital Book Readers: If you bought a digital-only edition of this book, you can enjoy select content from the print edition s companion CD. Visit http://go.microsoft.com/fwlink/ LinkId=144373 to get your downloadable content. This content is always up-to-date and available to all readers.

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Figure 3-8

Restoring Data 20-31

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Explain how IP addresses and subnetting work. Explain how name resolution works. Identify the primary name-resolution mechanisms that are used on Windows networks.

Exam Objectives in this :

Dim commands As New SqlCommandBuilder(SqlDataAdapter1)

A server that issues certificates from which a public and pri vate key are generated. Windows clients are preconfigured to trust a number of public CAs.

D is correct. You can block the application by creating an access rule to block the port used by the application. A is incorrect because you cannot specifically create packet filters in ISA Server 2004. B is incorrect because, if the application is already installed, the request is coming from an internal user and stateful filtering will allow the connection. C may be possible if you have an application filter that blocks the protocol used by the application, but just blocking the port is easier in this scenario.

You can enable security settings that restrict access to Display options. For example, you can remove the Appearance tab or the Settings tab from the Display Properties dialog box. For more information about security settings, see 16, Configuring Security Settings and Internet Options.

CREATE FUNCTION dbo.fnGetNumbersTable ( @StartNumber INT ,@EndNumber INT )