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Read other books and periodicals Pat yourself on the back for reading this book. You re already learning more than most people in the software industry because one book is more than most programmers read each year (DeMarco and Lister 1999). A little reading goes a long way toward professional advancement. If you read even one good programming book every two months, roughly 35 pages a week, you ll soon have a firm grasp on the industry and distinguish yourself from nearly everyone around you. Make a commitment to professional development Good programmers constantly look for ways to become better. Consider the following professional development ladder used at my company and several others:

Figure 12-30

If a service fails, you have four choices:

you configure the VPN router for Windows authentication or for RADIUS authentication and the RADIUS server is an IAS server, the default remote access policies reject all types of connection attempts unless the remote access permission of the user account s dial-in properties is set to Allow Access. If you want to manage authorization and connection parameters by group or by type of connection, you must configure additional remote access policies. For more information, see the Remote Access Policies section later in this chapter.

Level 1: Beginning. A beginner is a programmer capable of using the basic capabilities of one language. Such a person can write classes, routines, loops, and conditionals and use many of the features of a language. Level 2: Introductory. An intermediate programmer who has moved past the beginner phase is capable of using the basic capabilities of multiple languages and is very comfortable in at least one language. Level 3: Competency. A competent programmer has expertise in a language or an environment or both. A programmer at this level might know all the intricacies of J2EE or have the C++ Annotated C++ Reference Manual memorized. Programmers at this level are valuable to their companies, and many programmers never move beyond this level. Level 4: Leadership. A leader has the expertise of a Level 3 programmer and recognizes that programming is only 15 percent communicating with the computer, that it s 85 percent communicating with people. Only 30 percent of an average programmer s time is spent working alone (McCue 1978). Even less time is spent communicating with the computer. The guru writes code for an audience of people rather than machines. True guru-level programmers write code that s crystal-clear, and they document it too. They don t want to waste their valuable gray cells reconstructing the logic of a section of code that they could have read in a one-sentence comment.

A single service failure might be an anomaly. That is, the service could have failed to load initially because another service it depended on had not yet been started. This sit uation could occur for a number of reasons, including temporary slow disk access, or another service needing to finish writing to a log file before being fully started. Hence, because that other service was not fully started, this service could have requested to start, recognized that a service it depended on was not started, and simply missed the opportunity to start. Therefore, on the first failure, you are advised to restart the service. However, if the service fails multiple times, you could try to restart it again, run a program to let you know that the service has not started, or restart the computer to see whether the timing dependency has disappeared.

12-38

This is a simple example, but you can probably imagine a program in which the information about the phone-number length is needed in many places. At the time you create the program, the employees all live in one country, so you need only seven digits for their phone numbers. As the company expands and branches are established in different countries, you ll need longer phone numbers. If you have parameterized, you can make the change in only one place: in the definition of the named constant LOCAL_NUMBER_LENGTH. As you might expect, the use of named constants has been shown to greatly aid program maintenance. As a general rule, any technique that centralizes control over things that might change is a good technique for reducing maintenance efforts (Glass 1991).

12

Routing And Remote Access Server Setup Wizard configures both authentication and accounting providers to be the same. After the Wizard is complete, however, you can configure the authentication and accounting providers separately (for example, if you want to use Windows authentication and RADIUS accounting). You can configure authentication and accounting providers on the Security tab from the properties of the VPN router in the Routing And Remote Access snap-in. After the VPN router is configured, you can begin creating demand-dial interfaces and configuring routes using the Routing And Remote Access snap-in. For more information, see 9.