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Psychological distance can be defined as the ease with which two items can be differentiated. If you are looking at a long list of words and have been told that they re all about ducks, you could easily mistake Queck for Quack because the two words look similar. The psychological distance between the words is small. You would be much less likely to mistake Tuack for Quack even though the difference is only one letter again. Tuack is less like Quack than Queck is because the first letter in a word is more prominent than the one in the middle. Here are examples of psychological distances between variable names:

1. Open the Connection Manager Administration Kit Wizard, and click Next. 2. On the Service Profile Selection page, click Existing Profile, click L2TPCorp, and click Next.

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6

Table 23-1. Examples of Psychological Distance Between Variable Names First Variable Second Variable Psychological Distance

Do not leave DNS debug logging enabled during normal operation because it con sumes both processing and hard disk resources. Enable it only when diagnosing and solving DNS problems.

For details on creating variable 6 names that won t be 7 confusing, see Section 11.7, 8 Kinds of Names to Avoid.

3. On the Service And File Names page, type EAP To CorpNet in the Service Name text box, type EAPCorp in the File Name text box, and click Next. 4. On the Realm Name page, click Add A Realm Name To The User Name. If Suffix is not already clicked, click it. In Realm Name, type @example.com and then click Next. 5. On the Merging Profile Information page, click Next. 6. On the VPN Support page, select the Phone Book From This Profile check box, click Always Use The Same VPN Server, type 10.0.0.2, and click Next. 7. On the VPN Entries page, click the default entry and click Edit. 8. Click the Security tab. In the Security Settings drop-down list, click Use Advanced Security Settings and then click Configure. 9. Under Logon Security, click Use Extensible Authentication Protocol (EAP), and select Smart Card Or Other Certificate from the drop-down list. In the VPN Strategy drop-down list, click Try Point To Point Tunneling Protocol First (as shown in the following figure), and click Properties.

In this practice, you use Nslookup to perform basic DNS troubleshooting functions. You then configure the DNS log to capture packets and view the results.

In this exercise, you use Nslookup to perform forward and reverse lookups. 1. From Computer1, log on to Domain1 as Administrator. 2. Connect Computer1 to the Internet if it is not already connected. 3. Open a command prompt and type netsh interface ip set dns local area con nection static 192.168.0.1. This command ensures that the local DNS server is queried before a remote DNS server. 4. At the command prompt, type nslookup www.msn.com., and press Enter. 5. If you receive a time-out response, type the command again. You should receive an output similar to the following:

stoppt stcppt Almost invisible shiftrn shiftrm Almost none dcount bcount Small claims1 claims2 Small product sum Large As you debug, be ready for the problems caused by insufficient psychological distance between similar variable names and between similar routine names. As you construct code, choose names with large differences so that you avoid the problem.

Server: computer1.domain1.local Address: 192.168.0.1 Name: www.msn.com Addresses: 207.68.171.254, 207.68.172.253, 207.68.172.254, 207.68.173.253 207.68.173.254, 207.68.171.253

10. In the Smart Card Or Other Certificate Properties dialog box, click Use A Certificate On This Computer. Type dc1.example.com in the Connect To These Servers text box (as shown in the following figure). In the Trusted Root Certification Authorities drop-down list, select the Example CA check box. Click OK three times, and then click Next.

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The line between testing tools and debugging tools is fuzzy. For details on testing tools, see Section 22.5, Test-Support Tools. For details on tools for other softwaredevelopment activities, see 30, Programming Tools.

6. At the command prompt, type nslookup 207.68.173.253, and then press Enter. If you receive a time-out response, type the command again. You will most likely receive an output similar to this:

Server: computer1.domain1.local Address: 192.168.0.1 Name: feeds2.msn.com Address: 207.68.173.253

You can do much of the detailed, brain-busting work of debugging with debugging tools that are readily available. The tool that will drive the final stake through the heart of the defect vampire isn t yet available, but each year brings an incremental improvement in available capabilities.

To configure the test lab for EAP access, install a user certificate and the EAPCorp profile on CLIENT1.