c# qr code generator dll Designing a DNS Structure in Visual C#.NET

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Designing a DNS Structure
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Questions and Answers
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Lesson 1 Review
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1. What are the three zone transfer methods that may be used to replicate zone file data
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The three zone transfer methods are: IXFR, AXFR, and fast zone transfer. Fast zone transfer is the default zone transfer method in Windows Server 2003.
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2. What is one advantage of using Active Directory integrated zones as a zone type for a larger organization
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The biggest advantage is the avoidance of zone transfers. Replication can occur through Active Directory replication.
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3. In analyzing the current network infrastructure of your company, you note that there are several DNS servers spread out throughout the organization. One of the servers is taking a long time to update its records. What could be some of the rea sons for this time delay
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It is important to understand more than just the placement of servers in an organization if you are to fully understand and improve your troubleshooting skills. Your analysis of the current network should have also revealed the WAN link speeds between subnets, which can have a significant effect on zone transfers. If only a slow link is available, you may want to consider alternative ways to update resource records.
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Lesson 2 Practice
1. Using the forest and domain diagram presented in the scenario, identify the nam ing strategy would you use for Northwind Traders. Explain your strategy.
Different answers are possible, but a good naming strategy is illustrated in the following dia gram. Since the domain names are not to be resolvable from the Internet, the .local namespace is used.
RDNwtraders.local NWtraders.local
Glasgow Asia Pacific NAeast R&D Forest NAwest Corp
NWtraders Forest
Questions and Answers
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Lesson 2 Review
1. Your organization has over 350 users that are running Windows 98 and Windows NT Workstation operating systems. Users are constantly relocating to different locations throughout the company, requiring you to update host records in DNS. In designing your network strategy, which feature of DNS would lessen the administrative work of creating and updating these records
You can configure the DHCP server to perform updates on behalf of DHCP clients. DHCP will register the A (host) records and PTR records for all DHCP-enabled clients, saving the adminis trator from manually entering the information into DNS.
2. Your manager is concerned that DNS replication data traversing the network is vulnerable to attack. He read an article in a computer journal that discussed how a protocol analyzer could be introduced to the company s network and that the replication data from a zone transfer could be captured. What could you tell the manager to assure him or her that the data was not vulnerable
You could inform the manager that zone transfers can be restricted based on IP addresses and that the replication data between the DNS servers could also be encrypted.
3. What is the recommended BIND version for Active Directory support
BIND DNS servers should be running versions 8.1.2 or later.
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Lesson 3 Review
1. You are the network administrator of a Windows Server 2003 network that houses a legacy computer program running on a UNIX computer. The computer program requires that all workstations connecting to it be authenticated by verification of the workstation s host name. Users call and complain that they are no longer able to access the program and that they are receiving permission errors. What could be the possible cause of this problem
Because the UNIX program is verifying the workstation by using its host name, a reverse lookup zone is needed on this network. Reverse lookup zones resolve an IP address to a host name, whereas a forward lookup zone resolves host names to IP addresses. It is apparent from the information given in this question that users at one time were able to access the program. Hence, it appears that the DNS server that contained the reverse lookup zone is unavailable. In any event, the administrator needs to verify that a reverse lookup zone is available for the users and he or she should examine the possibility of creating a secondary zone for fault tolerance.
2. You are preparing to install a server on your network with the Windows Server 2003 operating system. This will be the first server on your network, and you plan to add the Domain Controller role after installing the operating system. What steps will you need to take to install DNS on this computer
Because there are no DNS servers on the network and you are running the Active Directory Installation Wizard, you will be prompted to install DNS, and it will automatically configure DNS on the server based on the TCP/IP configuration of the server.
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