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In SQL Server 2005, each column in a record must contain a value, even if that value is NULL. If a column does not allow for null values, you must explicitly specify a value for the column or the database engine returns an error. Because the value NULL might not be desirable and you might need to load a row of data into a table when you do not yet know some column values, you can apply a DEFAULT definition to the column. When you insert a row into a table but don t provide data for the column to which the DEFAULT definition applies, SQL Server automatically inserts the value in the DEFAULT definition.

If the IP address of the requesting client is 172.16.22.8, both of the IP addresses that match the same IP network as the client, the 172.16.0.0 network, are returned at the top of the response list to the client. However, in this example, the 172.16.22.4 address is placed ahead of the 172.16.31.5 address because it matches the client IP address down through the 172.16.20.0 subnet address.

[assembly: AssemblyKeyFile(@"C:\Key\ContosoPublicKey.snk )]

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The reordered answer list returned by the DNS service follows:

Note that the AssemblyVersion attribute (and AssemblyCulture attribute in C# only) already existed and did not need to be updated.

It is common practice to specify zero as the DEFAULT definition for numeric columns and N/A as the DEFAULT definition for string columns.

To disable local subnet prioritization for multihomed names, complete the following steps: 1. Open the DNS console and select the applicable DNS server. 2. From the Action menu, select Properties. 3. In the server properties dialog box, click the Advanced tab. 4. In the Server Options list, clear the Enable Netmask Ordering check box, and then click OK.

Exam Tip Netmask ordering is often referred to as the LocalNetPriority setting on MCSE exams. This name originates from the corresponding LocalNetPriority option used with the Dnscmd command-line utility.

The Enable Round Robin option is selected by default. This setting ensures that, in response to a request to resolve the name of a multihomed computer, DNS servers in Windows Server 2003 rotate the order of matching A resource records in the response list returned to subsequent clients. This feature provides a simple way to balance the network load for frequently queried multihomed computers among all the computer s network adapters. This feature is also commonly used to balance requests among mul tiple servers that offer identical network services, such as an array of Web servers pro viding content for a single Web site.

You should have used the following command:

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To create a DEFAULT definition for a column in a table, perform the following steps: 1. Open SSMS, and connect to the database instance that hosts the table that has the column to which you want to apply the DEFAULT definition.

The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. You would like to apply a new Registry setting to all the servers on your network. What is an efficient way to perform that task

You should have used the following command, which will return an error:

2. Which of the following settings can be applied using Security Configuration And Analysis and a security template (Choose all that apply.) a. The password must be 15 characters long. b. The Accountants group is not allowed to access this computer over the network. c. IPSec must be used for all communications between Computer1 and Computer2. d. The root file permissions should be Everyone Full Control. 3. Which steps might be necessary to recover from the application of a security tem plate to a file server that prevented all users from accessing the server over the network Choose the most efficient way. a. Log on locally to the file server as Administrator and apply the root security template. b. Log on locally to the file server as Administrator and apply the rollback tem plate produced from the bad security template. c. Log on remotely to the file server as Enterprise Admin and use the Local Secu rity Policy console to change the user rights policies that might be incorrect. d. Log on remotely to the file server as Administrator and apply the rollback template produced from the security template.

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