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

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Designing a DNS Structure
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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
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3. What is the recommended BIND version for Active Directory support
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Lesson Summary
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Designing a DNS namespace begins with understanding your current Active Direc tory environment. First, consider designing the Active Directory structure and then support that design with a DNS structure. It is critical that diagrams, maps, and well-written documentation be part of the design process. One of the most important aspects of your DNS design is securing the DNS components to reduce the risk of threats to your infrastructure. Footprinting, denial-of-service attacks, and polluting the DNS cache are some examples of the possible threats to your DNS infrastructure.
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Lesson 3
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Designing a DNS Implementation
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Lesson 3: Designing a DNS Implementation
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Now comes the time when you decide whether or not a server should be a cachingonly server or a primary DNS server, or which resource records will need to be created. The design should take into account the replication or zone transfer methodology, while keeping a close watch on your company s bandwidth limitations. In this lesson, you design a DNS zone storage strategy and configure the various server options. You also look once again at the resource records available to you in DNS.
After this lesson, you will be able to
Design a strategy for DNS zone storage. Identify the use of DNS server options.
Estimated lesson time: 15 minutes
When designing a DNS implementation, you should already have a good understand ing of your network topology, location of users, servers, routers, and so on. Figure 6-5 illustrates a high-level network diagram. This can later be modified to include more specific information such as zone types, DNS server placement, and so on.
Honolulu Office 1100 hosts
Kauai Office 250 hosts
Maui Office 300 hosts Internet
Tokyo Office 3000 hosts
Guam Office 15 hosts Taipei Office 700 hosts
Hong Kong Office 2500 hosts
Figure 6-5
This is an example of a high-level network diagram.
In this lesson, you are now prepared to make decisions in the following areas:
Which zone types will be part of your design, for instance, Active Directory inte grated, standard primary, or other types
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Designing a DNS Structure
Where will the DNS servers be placed on your network This is covered in greater detail in Lesson 4. Will your design need to consider integration with UNIX BIND DNS, or older ver sions of DNS Will your design incorporate integration with other networking services such as DHCP and WINS Will your DNS namespace design integrate with your Active Directory namespace
Zone Storage
In Lesson 1, you briefly looked at the various methods by which zones could be stored in your DNS infrastructure. If you install Active Directory on a server, you can store your zone files two different ways:
A text-based file stored in the systemroot\System32\DNS folder on each DNS server computer. For example, if you created a zone file for a domain named mar keting.contoso.com, the zone file would be called marketing.contoso.com.dns. Note that the extension of zone files is dns. In the Active Directory tree under the domain or application directory partition (discussion follows). The benefits of using Active Directory integrated zones were covered in Lesson 2.
Application Directory Partitions
As you learned in Lesson 2, DNS zones can be stored in the Active Directory database. You can also store a zone in an application directory partition. An application directory partition gives you the ability to store data in Active Directory that you want to repli cate only to specific domain controllers.
Stub Zones
A stub zone is a copy of a zone that contains only the resource records needed to iden tify an authoritative DNS server. An authoritative DNS server is a server that hosts resource records for a particular DNS zone. For example, an authoritative DNS server for the zone training.contoso.com would contain resource records for that zone. Rather than a DNS server having to query the Internet to locate an authoritative DNS server, the DNS server can simply refer to the list of name servers (NS resource records) in the stub zone. Distributing a list of authoritative DNS servers for a zone can be implemented by using stub zones. Unlike secondary zones, which primarily are used for redundancy and load-balancing reasons, stub zones are used to improve name resolution performance.
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