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In a packet filtering implementation designed for locked-down security, four filters are created for access to each service. As shown in Figure 9-40, one packet filter in this scenario is designed to match each of the four steps required for communication.
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8. Click Next. On the Static Routes For Remote Networks page, click Add.
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When viewed holistically, the Java and .NET platforms are comparable: both provide solutions to most contemporary business computing issues. However, when the platforms are broken down into functional components, mapping between the constituent parts is often very loose. The .NET class library doesn't yet encompass all the functionality found in the J2EE class libraries and often needs to utilize other Microsoft technologies to provide a complete solution; we expect that these technologies will become more tightly integrated as the .NET platform matures. Despite these inconsistencies, we proceed with a liberal attitude, presenting technology alternatives that are accessible from the .NET platform even though they are not explicitly part of it.
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Correct Answer: B
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You're also allowed to group by the result of an expressionfor instance, GROUP BY YEAR(orderdate). If you do, when working in SQL Server 2000, all following steps cannot perform any further manipulation to the GROUP BY expression, unless it's a base column. For example, the following is not allowed in SQL Server 2000: SELECT YEAR(orderdate) + 1 AS nextyear ... GROUP BY YEAR(orderdate). In SQL Server 2005, this limitation has been removed.
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T-SQL supports two different syntaxes for joins. There's a lot of confusion surrounding the two. When do you use each Which performs better Which is standard and which is proprietary Is the older syntax going to be deprecated soon And so on. Hopefully, this chapter will clear the fog. I'll start by saying there are two different syntaxes for joins supported by the ANSI standard, and neither is in a process of deprecation yet. The join elements of the older standard are a complete part of the newer. This means that you can use either one without worrying that it will not be supported by Microsoft SQL Server sometime soon. SQL Server will not remove support for implemented features that were not deprecated by the standard. The older of the two syntaxes was introduced in ANSI SQL:1989. What distinguishes it from the newer one is the use of commas to separate table names that appear in the FROM clause, and the absence of the JOIN keyword and the ON clause: FROM T1, T2 WHERE where_filter
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This time the procedure identified that it was invoked from an outer transaction, and upon error rolled back only its own activity (to the savepoint) . To demonstrate a failed transaction, set XACT_ABORT ON and try again:
[AttributeUsage(AttributeTargets.Class, Inherited = false)] [Serializable] public sealed class AttributeUsageAttribute : Attribute { internal AttributeTargets m_attributeTarget = AttributeTargets.All; internal Boolean m_allowMultiple = false; internal Boolean m_inherited = true; public AttributeUsageAttribute(AttributeTargets validOn) { m_attributeTarget = validOn; } public AttributeTargets ValidOn {
internal sealed class SimpleType : IDisposable { public void Dispose() { Console.WriteLine("public Dispose"); } void IDisposable.Dispose() { Console.WriteLine("IDisposable Dispose"); } }
with a name of .ctor) is public, and its code is also IL . The constructor has a void return type, has no arguments, and has a this pointer, which refers to the object s memory that is to be constructed when the method is called . I strongly encourage you to experiment with using ILDasm . It can show you a wealth of information, and the more you understand what you re seeing, the better you ll understand the CLR and its capabilities . As you ll see, I ll use ILDasm quite a bit more in this book . Just for fun, let s look at some statistics about the Program .exe assembly . When you select ILDasm s View/Statistics menu item, the following information is displayed:
plus the hierarchy, it should have Users, not Contacts, as its members. We think it s a good idea to create an OU just to hold your contacts, making it clear what they are and helping to keep things organized. Where to put the Contacts OU And what to call it Well, as for what to call it, Contacts seems like a perfectly good name, and it has the virtues of being both descriptive and simple. For where, we like to put it under the MyBusiness OU, because that s where everything for SBS tends to go, and then leaving it at the rst level below that, as shown in Figure 18-17. But, ultimately it doesn t really matter just choose a place that works for you and then stick to it.
<body> <form runat=server> <center> <h3> <font face="Verdana" color=blue>Control Test Page State </font> </h3> <table> <tr> <td> Name:
FROM dbo.SalesGrp GROUP BY sgn, grp; GO
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Even though it's possible to generate a thread-safe collection, enumerators are still troublesome. .NET enumerators are backed by the underlying collection, and any changes to the elements can cause problems. .NET takes the approach in common with Java of throwing an exception if the elements are changed during the life of an enumerator.
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