M

Workstation #5

Workstation #20

Production

File Server #1

File Server #2

File Server #3

Workstation #2

Workstation #197

Web Server

FTP Server

E-mail Server #1

Perimeter Network

Lesson Review

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. Which of the following is the best reason to create subdomains in a DNS namespace?

a. To speed up the name resolution process b. To delegate administrative authority over parts of the namespace c. To create identical host names in different domains d. To duplicate an existing Internet namespace

2. Why should you never use the same domain name for your internal and external namespaces?

3. Which of the following domain naming examples, for an organization with the registered domain adatum.com, conforms to the practices recommended by Microsoft?

a. An external domain called ext-adatum.com and an internal domain called int-adatum.com b. An external domain called ext.adatum.com and an internal domain called adatum.com c. An external domain called ext.adatum.com and an internal domain called int.adatum.com d. An external domain called adatum.com and an internal domain called int.adatum.com

Lesson Summary

■ When creating a DNS namespace, devise naming rules for domains and hosts and stick to them.

■ If you require multiple domains for your DNS infrastructure, you can either register several second-level domain names or register one domain name and create additional domain levels beneath it.

■ Creating subdomains enables you to delegate authority over parts of the namespace and to balance the DNS traffic load among multiple servers.

■ When combining internal and external domains, the recommended practice is to use a registered domain name for the external network and to create a subdomain beneath it for the internal network.

■ Creating an internal root speeds up the name resolution process by keeping the process wholly inside the enterprise.

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