data matrix vb.net Configuring DHCP Servers and Clients in .NET framework

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Configuring DHCP Servers and Clients
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Adding Members to the DnsUpdateProxy Group You can configure the DnsUpdateProxy global security group through the Active Directory Users And Computers console, as shown in Figure 7-14.
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Figure 7-14
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Configuring DnsUpdateProxy
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Important If you are using multiple DHCP servers for fault tolerance, and secure DNS dynamic updates are required on zones serviced by these DHCP servers, be sure to add each of the computers operating a Windows Server 2003 DHCP server to the DnsUpdateProxy glo bal security group.
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Security Concerns Although adding all DHCP servers to this special built-in group helps resolve some concerns about maintaining secure DNS updates, this solution also introduces some additional security risks. For example, any DNS domain names registered by the computer running the DHCP server are not secure. The A resource record for the DHCP server itself is an example of such a record. To protect against this risk, you can manually specify a different owner for any DNS records associated with the DHCP server itself. However, a more significant issue arises if the DHCP server (which is a member of the DnsUpdateProxy group) is installed on a domain controller. In this case, all service location (SRV), host (A), or alias (CNAME) resource records registered by the Netlogon service for the domain controller are not secure. To minimize this problem, you should not install a DHCP server on a domain controller when using dynamic updates.
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Caution For Windows Server 2003, the use of secure dynamic updates can be compro mised by running a DHCP server on a domain controller when the Windows Server 2003 DHCP service is configured to perform registration of DNS records on behalf of DHCP clients. To avoid this problem, deploy DHCP servers and domain controllers on separate computers.
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Lesson 3
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Configuring DHCP Servers to Perform DNS Updates
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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 action needs to be taken if you want to configure a DHCP server to update both A resource records and PTR resource records on behalf of a Windows NT 4 client a. No action is required. b. On the DNS tab of the DHCP server properties dialog box, select Dynamically Update DNS A And PTR Records For DHCP Clients That Do Not Request Updates. c. On the DNS tab of the DHCP server properties dialog box, select Always Dynamically Update DNS A And PTR Records. d. Register the client as a dynamic host with the DHCP server. 2. You have not modified the default settings for DNS on the DHCP client or server. Which of the following client record or records will be updated in DNS by the DHCP server (Assume that the clients are running Windows XP.) a. The PTR resource record b. The A resource record c. Both the PTR and A resource records d. Neither the PTR nor the A resource record 3. For a zone in which only secure dynamic updates are allowed, you have config ured your DHCP server to perform dynamic updates on behalf of Windows NT cli ents. All other dynamic DNS settings on the DHCP server have the default settings. After you migrate the clients to Windows XP, you find that their A resource records are no longer being updated. What is the most likely explanation for this problem
4. Under what conditions is it not considered secure to host a DHCP server on a domain controller Why is this setup not secure
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