02-Configuring Domain Name Service for Active Directory Domain Services

The Active Directory database is divided into directory partitions, with each directory partition replicated to specific domain controllers.?. Options for Configuring Application Partit[r]

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Module 2: Configuring Domain Name Service

for Active Directory®

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Module Overview

• Overview of Active Directory Domain Services and DNS Integration

• Configuring Active Directory Integrated Zones

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Lesson 1: Overview of Active Directory Domain Services and DNS Integration

• Active Directory Domain Services and DNS Namespace Integration

• What Are Service Resource Locator Records?

• Demonstration: SRV Locator Records Registered by AD DS Domain Controllers

• How Service Resource Locator Records Are Used

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Active Directory Domain Services and DNS Namespace Integration

WoodgroveBank.com

Active Directory domain names must use DNS names

Corp.WoodgroveBank.com

Woodgrovecorp.com

You can integrate an Active Directory domain name with the external name space by using:

• The same name space

• A sub domain of the external name space

• A different name space where the domain and local are different

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What Are Service Locator Records?

SRV resource records allow DNS clients to locate TCP/IP-based Services SRV resource records are used when:

• A domain controller needs to replicate changes

• A client computer logs on to Active Directory

• A user attempts to change his or her password

• An Exchange 2003 server performs a directory lookup

• An administrator modifies Active Directory

_ldap._tcp.contoso.msft 600 IN SRV 100 389 den-dc1.contoso.msft

protocol.service.name TTL class type priority

weight port target

protocol.service.name TTL class type priority weight port target

SRV record syntax:

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Demonstration: SRV Resource Records Registered by AD DS Domain Controllers

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How Service Resource Locator Records Are Used

Locator initiates a call to Net Logon service

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Net Logon uses the information and queries DNS for SRV resource records

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Net Logon tests connectivity to target servers

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Locator collects information about the client

2

Domain controllers respond, indicating that they are operational

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Net Logon returns the information to clients

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Integration of Service Locator Records and Active Directory Sites

1 Queries DNS

for DC

4 MIA-DC1 returns site info NYC

2 Responds w

ith multiple rec ords

5 Queries DNS

for DC in NYC s ite

6 Responds wi

th DC in NYC sit e

Miami Site Miami Site

3 Contacts M

IA-DC1 by using LDAP

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Lesson 2: Configuring Active Directory Integrated Zones

• What Are Active Directory Integrated Zones?

• What Are Application Partitions in AD DS?

• Options for Configuring Application Partitions for DNS

• How Dynamic Updates Work

• How Secure Dynamic DNS Updates Work

• Demonstration: Configuring AD DS Integrated Zones

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What Are Active Directory Integrated Zones?

Active Directory integrated zones store DNS zone data in the Active Directory database

Benefits of using Active Directory integrated zones:

• Replicates DNS zone information using Active Directory replication

• Supports multiple master DNS servers

• Enhances security

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What Are Application Partitions in AD DS?

• A DNS zone can be stored in the domain partition or in an

application partition

• Administrators can define the replication scope of custom

application partitions

• DomainDNSzones and forestDNSzones are default application

partitions that store DNS-specific data

Domain Config Schema App1 App2 Domain Config Schema Domain Config Schema App1

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Options for Configuring Application Partitions for DNS

To all domain controllers that are DNS servers in the Active

Directory domain

To all domain controllers in the replication scope for the

Directory forest

To all domain controllers in the Active Directory domain

Domain Config Schema DomainDNSZone ForestDNSZones CustomApp

DNS information can be stored in a variety of application partitions

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How Dynamic Updates Work

Client sends SOA query DNS server sends zone

name and server IP address Client verifies existing

registration

DNS server responds by stating that registration does not exist

Client sends dynamic update to DNS server

Resource Records DNS Server Windows Server 2008 Windows

Vista Windows XP

1 1 3 3 4 4 2 2 5 5 1

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How Secure Dynamic DNS Updates Work

Find authoritative server Result

Attempt nonsecure update Refused

Secure update negotiation Accepted

A secure dynamic update is accepted only if the client has the proper credentials to make the update

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Demonstration: Configuring AD DS Integrated Zones

In this demonstration, you will see how to configure:

• A DNS zone as AD DS integrated

• Dynamic updates on DNS zones

• Dynamic update settings on a network connection

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How Background Zone Loading Works

When a domain controller with Active Directory integrated DNS zones starts, it:

• Enumerates all zones to be loaded

• Loads root hints from files or AD DS servers

• Loads all zones that are stored in files rather than in AD DS

• Begins responding to queries and RPCs

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Lesson 3: Configuring Read-Only DNS

• What Is Read-Only DNS?

• How Read-Only DNS Works

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What Is Read-Only DNS?

• A feature supported on Read-Only Domain Controllers

• All application partitions containing DNS information are replicated to the RODC

Benefits:

• DNS information required for Active Directory name resolution is available for clients in the same site as the RODC

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How Read-Only DNS Works

Read-only DNS is installed on an RODC when AD DS is installed and the DNS option is selected

• Read-only DNS zone data can be viewed, but cannot be updated

• Dynamic DNS updated clients using the RODC are referred to a DNS server with a writeable copy of the zones

• Records cannot be manually added to the read-only zone

1

2

3

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Discussion: Comparing DNS Options for Branch Offices

• What options other than read-only DNS are available for implementing DNS in the branch office?

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Lab: Configuring AD DS and DNS Integration

• Exercise 1: Configuring Active Directory Integrated Zones

• Exercise 2: Configuring Read-Only DNS Zones

Logon information

Virtual machine NYC-DC1, MIA-RODC

User name Administrator

Password Pa$$w0rd

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Lab Review

• What would be the advantage to storing the Active

Directory integrated DNS zones in a custom application partition instead of the default partitions?

• What steps could you take to recover the SRV resource records if they were deleted or corrupted?

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Module Review and Takeaways

• Review questions

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Beta Feedback Tool

• Beta feedback tool helps:

 Collect student roster information, module feedback, and course evaluations

 Identify and sort the changes that students request, thereby facilitating a quick team triage

 Save data to a database in SQL Server that you can later query

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Beta Feedback

• Overall flow of module:

 Which topics did you think flowed smoothly from topic to topic?

 Was something taught out of order?

• Pacing:

 Were you able to keep up? Are there any places where the pace felt too slow?

 Were you able to process what the instructor said before moving on to next topic?

 Did you have ample time to reflect on what you learned? Did you have time to formulate and ask questions?

• Learner activities:

 Which demos helped you learn the most? Why you think that is?

 Did the lab help you synthesize the content in the module? Did it help you to understand how you can use this

knowledge in your work environment?

 Were there any discussion questions or reflection questions that really made you think? Were there questions you