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Advanced Active Directory infrastructure

f you are the administrator of a medium to large organization, it is likely that you are responsible for managing multiple domains, perhaps even multiple forests, rather than managing a single domain forest. In this chapter you discover how and why you would configure forests with multiple domain trees and the benefits of each functional level. You also find out how to configure and manage different types of trust relationships to ensure users in one forest or domain are granted appropriate access to resources in another forest, domain, or Kerberos realm.

Lessons in this chapter:
  • Lesson 1: Configure domains and forests
  • Lesson 2: Configure trusts
Before you begin
To complete the practice exercises in this chapter, you need to have deployed computers SYD-DC, MEL-DC, CBR-DC, and ADL-DC as described in the Introduction, using the evaluation edition of Windows Server 2012.


Lesson 1: Configuring domains and forests
As an experienced administrator you’re probably quite familiar with the configuration of single domain Active Directory forests. In this lesson, you find out more about multidomain and multiforest environments. You discover how to upgrade an existing domain and forest so that it uses only Windows Server 2012 domain controllers, and you find out how to configure UPN suffixes.

Multidomain Active Directory environments
The majority of current Active Directory deployments in small- and medium-sized enterprises have a single domain. This hasn’t always been the case because earlier versions of the Windows Server operating system, such as Windows NT4, supported far fewer user accounts. Supporting a smaller number of accounts often necessitated the use of multiple domains, and it wasn’t unusual to see medium-sized organizations that used complicated domain structures.

Each Windows Server 2012 domain controller can create approximately 2.15 billion objects during its lifetime, and each domain supports the creation of up to approximately 2.15 billion relative identifiers (RIDs). Given these statistics, few administrators implement multiple domain forests because they need to support a large number of users. Of course, in very large organizations, the replication load between sites might make a domain with several hundred thousand user accounts problematic, but site and replication considerations are covered in Chapter 2, “Active Directory sites and replication.”

There are many reasons why organizations implement multidomain forests. These can include but are not limited to:
  • Historical domain structure Even though newer versions of the Windows Server operating system handle large numbers of objects more efficiently, some organizations have retained the forest structure that was established when the organization first adopted Active Directory.
  • Organizational or political reasons Some organizations are conglomerates, and they might be composed of separate companies that share a common administrative and management core. An example of this is a university faculty in Europe or Australia, such as a Faculty of Science, that is composed of different departments or schools, such as the school of physics and the department of botany. For political or organizational reasons it might have been decided that each department or school should have its own domain that is a part of the overall faculty forest. Active Directory gives organizations the ability to create domain namespaces that meet their needs, even if those needs might not directly map to the most efficient way of accomplishing a goal from a strict technical perspective.
  • Security reasons Domains enable you to create security boundaries so that you can have one set of administrators who are able to manage computers and users in their own domain, but who are not able to manage computers and users in a separate domain. Although it’s possible to accomplish a similar goal by delegating privileges, many organizations prefer to use separate domains to accomplish this goal.

Domain trees
A domain tree is a set of names that share a common root domain name. For example contoso.com can have pacific.contoso.com and atlantic.contoso.com as child domains, and these domains can have child domains themselves. A forest can have multiple domain trees. When you create a new tree in a forest, the root of the new tree is a child domain of the original root domain. In Figure 1-1, adatum.com is the root of new domain tree in the contoso.com forest.

FIGURE 1-1 Contoso.com as the root domain in a two-tree forest


The depth of a domain tree is limited by a maximum fully qualified domain name (FQDN) length for a host of 64 characters. This means that the host name and the domain name combined cannot exceed 64 characters, including the periods that separate each component of the name. For example, the name 3rd-floor-printer could not be used in the melbourne. victoria.australia.pacific.contoso.com domain because it cannot be used as a hostname in an Active Directory forest as the hostname exceeds the 64-character limit.

Intra-forest authentication
All domains within the same forest automatically trust one another. This means that in the environment shown in Figure 1-1, you can assign a user in the Australia.pacific.contoso.com permissions to a resource in the arctic.adatum.com domain without performing any extra configuration.

Because of the built-in automatic trust relationships, a single forest implementation is not appropriate for separate organizations, even when they are in partnership with one another. A single forest makes it possible for one or more users to have administrative control. Most organizations aren’t comfortable even with trusted partners having administrative control over their IT environments. When you do need to allow users from partner organizations to have access to resources, you can configure trust relationships or federation. You read more about trust relationships in Lesson 2 of this chapter and more about federation in Chapter 10, “Active Directory Federation Services.”

Data Granularity

Data Granularity
In an operational system, data is usually kept at the lowest level of detail. In a point-of-sale system for a grocery store, the units of sale are captured and stored at the level of units of a product per transaction at the checkout counter. In order entry systems, the quantity ordered is captured and stored at the level of units a product per order received from the customers. Whenever you need summary data, you add up the individual transaction  

Usually the data In the data warehouse is not updated or deleted.



Figure 2-3 The data warehouse is nonvolatile,

If you are looking for units of a product ordered this month, you read all the Akers entered for the entire month for that product and add up. You do not usually keep summa-ry data in an operational system.

When a user queries the data ‘warehouse for analysis, he or she usually starts by looking at summary data. The user may start with total sale units of a product in an entire region. Then the user may want to look at the breakdown by states in the region. The next step may be the examination or sale units by the next level of individual stores. Frequently, the analysis begins at a high level and moves down to lower levels of detail.

In a data warehouse, therefore, you find it efficient to keep data summarized at different levels. Depending on the query, you can then go to the particular level of detail and satisfy the query. Data granularity in a data warehouse refers to the level of detail. The lower the level of detail, the finer the data granularity. Of course, if you want to keep data in the lowest level of detail, you have to store a lot of data in the data warehouse. You will have to decide on the granularity levels based on the data types and the expected system performance for queries. Figure 2-4 shows examples of data granularity in a typical data warehouse.

70-412 Question 39

70-412 Question 39
You have a server named Server1 that runs Windows Server 2012 and is used for testing. A developer at your company creates and installs an unsigned kernel-mode driver on Server1. The developer reports that Server1 will no longer start. You need to ensure that the developer can test the new driver. The solution must minimize the amount of data loss. Which Advanced Boot Option should you select?

70-412

A. Disable Driver Signature Enforcement
B. Disable automatic restart on system failure
C. Last Know Good Configuration (advanced)
D. Repair Your Computer

Correct Answer: A
Section: (none)


Explanation
Explanation/Reference:

70-412 Question 38

70-412 Question 38
Your network contains two Active Directory forests named contoso.com and fabrikam.com. The contoso.com forest contains two domains named corp.contoso.com and contoso.com. You establish a two-way forest trust between contoso.com and fabrikam.com. Users from the corp.contoso.com domain report that they cannot log on to client computers in the fabrikam. com domain by using their corp.contoso.com user account. When they try to log on, they receive following error message: "The computer you are signing into is protected by an authentication firewall.

The specified account is not allowed to authenticate to the computer." Corp.contoso.com users can log on successfully to client computers in the contoso.com domain by using their corp.contoso.com user account credentials. You need to allow users from the corp.contoso.com domain to log on to the client computers in the fabrikam. com forest. What should you do?

A. Configure Windows Firewall with Advanced Security.
B. Enable SID history.
C. Configure forest-wide authentication.
D. Instruct the users to log on by using a user principal name (UPN).

Correct Answer: C
Section: (none)


Explanation
Explanation/Reference: