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Sets the enumerator to its initial position, logically before the first element of the collection By implementing this relatively simple interface, an object can enable itself to be bound to another object that expects to get an IEnumerator object. In the Visual Basic 6.0 world, you might bind a combo box or a list box to a recordset from a database. In the .NET world, you can bind anything from an array to an XML stream to a combo box or a list box. To expose an enumerator and add support for the For Each construct, the IEnumerable interface must be implemented. IEnumerable has a single method, which is listed in Table 8-2. Table 8-2 : Members of the IEnumerable Interface Interface Member GetEnumerable method Description

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Delegates are a type introduced by C# that has no direct analogue in Java. Delegates provide an object-oriented type-safe mechanism for passing method references as parameters without using function pointers. Delegates are primarily used for event handling and asynchronous callbacks. Instances of delegates contain references to one or more methods; this is known as an invocation list. Methods are added to the invocation list through the delegate constructor and subsequent use of simple operators. Through the delegate, the methods on the invocation list can be executed. Delegates do not provide functionality that is impossible to achieve in Java. The use of appropriate design patterns and interfaces in Java can provide equivalent capabilities; however, delegates are an elegant and powerful feature. Since delegates are used extensively throughout the .NET class libraries, a detailed understanding of how they work is important.

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Standard Filter Level Setting Registry Value AllowHTTPS BlockControls BlockUserInit UseHooks UseTimerMethod High 0 1 1 0 0 Medium 0 0 0 1 0 Low 1 0 0 1 1

The class features two methods one to check the robustness of a given password and one to generate a new strong password. Of course, the definition of a strong password is arbitrary. Once placed in the Code directory, this class is compiled on demand and made available to all pages. In the sample page, the code to generate and validate a password becomes simpler and more readable.

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When the Enable DNS Dynamic Updates According To The Settings Below check box is selected, which is the default, dynamic update is enabled for the DHCP server. When it is enabled, either of two options is specified. If the first option, the default, is selected (shown in Figure 7-13), the DHCP server attempts to update resource records only according to the client s request. When you select the second option, the DHCP server always attempts to update the client s A and PTR resource records after an address event, regardless of the client request. However, this setting is significant only for DHCP clients capable of requesting dynamic updates, including computers running Windows 2000, Windows XP, or Windows Server 2003. When you clear the Enable DNS Dynamic Updates According To The Settings Below check box, the DHCP server never attempts dynamic updates on behalf of Windows 2000, Windows XP, or Windows Server 2003 clients. Another setting you can configure on the DNS tab of the DHCP server properties dialog box is the Discard A And PTR Records When Lease Is Deleted check box. By default, this check box is selected, which means that the DHCP server removes clients resource records from DNS when their DHCP address leases are deleted. However, by clearing this check box, you can configure the DHCP server to leave client records in DNS even when a client s DHCP address lease is deleted. The final dynamic update setting you can configure on this tab determines whether the DHCP server should provide dynamic DNS update service on behalf of DHCP clients not capable of performing dynamic updates, such as computers running Microsoft Windows NT 4. By default, Windows Server 2003 DHCP servers do not attempt to per-

Authorizing Remote Access Connections 10-37

Implementing, Managing, and Maintaining Network Security (3.0)

In the previous section, you saw that several version numbers can be applied to an assembly . All of these version numbers have the same format: each consists of four period-separated parts, as shown in Table 2-5 .

Creating a digital movie with Windows Movie Maker isn t quite as easy as 1-2-3, but that s how many steps are involved:

client is designed to handle attachments with a maximum of 255-character lenames, and you receive a message that has a lename with 256 characters, a buffer over ow can occur. When this happens, memory space adjacent to that lename buffer gets overwritten and malicious code can end up being executed with the privileges associated with the original program. The infamous MSBlaster worm was this type of exploit. The hardware DEP in x64 processors protects against this type of exploit. This buffer over ow protection is combined with Microsoft s PatchGuard technology, which prevents non-Microsoft-originated programs from patching the Windows kernel. This technology, available only on 64-bit Windows, prevents kernel mode drivers from extending or replacing kernel services, including system service dispatch tables, the interrupt descriptor table (IDT), and the global descriptor table (GDT). Third-party software is also prevented from allocating kernel stacks or patching any part of the kernel.

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