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Windows Firewall is now disabled for the local area connection. A bubble appears in the notification area informing you that your computer is at risk because the firewall is disabled. 3. In the Network Connections window, right-click Local Area Connection, and then click Properties. In the Local Area Connection Properties dialog box, click the Advanced tab. In the Windows Firewall section, click Settings. 4. In the Windows Firewall dialog box, on the Advanced tab, select the check box next to Local Area Connection, and then click OK. Windows Firewall is now enabled for the local area connection. Leave the Local Area Connection Properties dialog box open for the next exercise.

This mapping enables a unique key constraint at the database level that spans two columns. Let s also assume that the business key properties are immutable. This is unlikely, because you probably allow users to update their email addresses, but the functionality we re presenting now makes sense only if you re dealing with an immutable business key. You map immutability as follows:

1. In the Local Area Connection Properties dialog box, on the Advanced tab, in the Windows Firewall section, click Settings. 2. In the Windows Firewall dialog box, on the Exceptions tab, select the File And Printer Sharing check box. 3. Click OK. Windows Firewall is now configured to allow file and printer sharing traffic into your computer. 4. Click OK again to close the Local Area Connection Properties dialog box.

Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. You are troubleshooting a network connection and need to use the Ping command to see if a computer is reachable. Which ICMP exception must you enable on that computer Choose the correct answer. a. Allow Incoming Router Request b. Allow Incoming Echo Request c. Allow Outgoing Source Quench d. Allow Redirect

<class name="User"> <id name="id".../> <property name="username" unique-key="UNQ_USERKEY" update="false"/> <property name="emailAddress" unique-key="UNQ_USERKEY" update="false"/> ... </class>

Configuring Windows Firewall 15-59

3. Windows Firewall protects a computer running Windows XP Professional even while the computer is starting up. (True/False)

Or, to utilize cache lookups by business key, you can map it with <natural-id>:

Elsie, a user at Contoso, Ltd., calls the help desk early one morning and reports that she is unable to log on to her Windows 7 workstation. After confirming that Elsie is using the correct account name and password, you ask her whether the other users around her have been able to log on this morning. She answers yes, no one seems to be having trouble except her. Then you ask Elsie to try logging on from another nearby workstation. After a few minutes, she reports back that her logon attempts fail from the other workstation also. Based on the information you have so far, which of the following conclusions can you make about Elsie s problem Explain why each option is or is not correct.

Windows Firewall is a software-based firewall built into Windows XP Professional. Windows Firewall blocks all incoming network traffic except for solicited traffic and excepted traffic. You can enable or disable Windows Firewall globally for all network connections on a computer, including LAN, dial-up, and wireless connections. You can also enable or disable Windows Firewall selectively for each network connection on a computer. Windows Firewall allows you to configure a number of advanced options, including the following:

Enabling Windows Firewall logging to log network activity Creating an exception for a service or application to allow traffic through the firewall Creating a custom service definition when a built-in exception does not suit your needs Creating an ICMP exception so that the computer responds to traffic from certain network utilities

<class name="User"> <id name="id".../> <cache usage="read-write"/> <natural-id mutable="false"> <property name="username"/> <property name="emailAddress"/> </natural-id> ... </class>

Troubleshooting Windows Firewall typically involves enabling or disabling Windows Firewall and creating exceptions so that specific network traffic is allowed into the computer.

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Summary

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This grouping automatically enables the generation of a unique key SQL constraint that spans all grouped properties. If the mutable attribute is set to false, it also prevents updating of the mapped columns. You can now use this business key for cache lookups: