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ICF works with an Internet connection to provide security from external attacks. ICF uses a method of protection known as the table method, in which a table or list of outbound and inbound IP addresses is maintained. Consider first how ICF works when a standalone computer uses ICF. You enable ICF on the Internet connection, as detailed in Activating and Configuring ICF on page 124. Using your Web browser, you request a Web page. ICF makes an entry in its outbound connections table noting the IP address of the site you are requesting. When the Web page is served back to the computer, ICF examines the IP packets and looks at the IP addresses. If ICF finds a match for the sending address in the list of destination addresses for outbound traffic, the assumption is that you requested the IP traffic and therefore ICF allows the traffic to enter the computer. However, if any traffic arrives at the firewall that does not match a destination IP address listed in the table, the IP packets are dropped and are not processed by the computer. ICF is considered a stateful firewall because it examines all traffic passing in and out of the firewall and makes decisions concerning that traffic as needed. In other words, ICF considers the current state of the packets and determines whether they are allowed or not based on the ICF table, as the following diagram shows.

Execute a plan. Test potential solutions and have a contingency plan if these solutions do not work or have a negative impact on the computer. Be sure to back up critical system or application files. For more information, see Avoid Common Pitfalls later in this chapter.

Determine whether your plan was successful. Have another plan in place to address unresolved issues.

Check results. Take a proactive approach. Document changes that you make along the way while troubleshooting the problem. After resolving the problem, organize your notes and evaluate your experience. Think about ways to avoid or reduce the impact of the problem in the future. For more information, see Document and Evaluate the Results and Take Proactive Measures later in this chapter.

Table of Contents Using the Address Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215 Using Keyboard Shortcuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217 8

For more information about the preceding steps, see Troubleshooting Concepts and Troubleshooting Strategies later in this chapter.

The immediate goal of any troubleshooting session is to restore service as quickly as possible. However, the larger goal is to determine the cause of the problem. Root-cause analysis is the practice of searching for the source of problems to prevent them from recurring. Problems represent deviations from known or expected behavior, and the most effective way to solve a problem is to gather information before acting and then isolate and eliminate variables.

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Start by observing and identifying symptoms of the problem. You need to learn more about the circumstances in which problems occur and become familiar with system behavior when issues arise. Here are some questions that you can use to help identify symptoms: Do error messages appear If error messages appear, record the error numbers, the exact message text, and a brief description of the activity. This information is useful when researching the cause of the problem or when consulting with technical support. In your description, include events that precede or follow a problem and the time and date of the error. For complex or lengthy messages, you can use a program such as Microsoft Paint (Mspaint.exe) to record the error message as a bitmap.

This means these two columns would ensure the uniqueness of a row in the OrderDetail table In the OrderHeader table, OrderID is the primary key..

Part V: