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MCSE: Windows 2000 Network Infrastructure Administration Study Guide

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The new Windows 2000 MCSE certification track is here! And Sybex, the leader in certification self-study material, has what you need to approach the exams with confidence. The MCSE: Windows 2000 Network Administration Study Guide provides in-depth coverage of all official exam objectives. In addition to the practical, real-world instruction ...
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Overview

The new Windows 2000 MCSE certification track is here! And Sybex, the leader in certification self-study material, has what you need to approach the exams with confidence. The MCSE: Windows 2000 Network Administration Study Guide provides in-depth coverage of all official exam objectives. In addition to the practical, real-world instruction in the book, the accompanying CD comes with the following valuable study tools:
  • Pre-Assessment Exams
  • Program Simulators
  • Electronic Flashcards for PCs and Palm Devices
  • Sample Adaptive Exams
  • Bonus Review Questions
  • Searchable Electronic Version of Entire Book
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Product Details

  • ISBN-13: 9780782127553
  • Publisher: Sybex, Incorporated
  • Publication date: 7/1/2000
  • Series: MCSE Ser.
  • Edition description: Older Edition
  • Pages: 702
  • Product dimensions: 7.82 (w) x 9.31 (h) x 1.77 (d)

Meet the Author

Paul Robichaux is a noted networking expert and the author of more than twenty books, including Remote Access 24seven, also from Sybex. In addition, he has written numerous white papers for Microsoft.

James Chellis, MCT, is president of EdgeTek Technical Education, a national network training company and Microsoft Solution Provider specializing in Windows NT.

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Read an Excerpt

Chapter 6: Installing and Managing Domain Name Service (DNS)

The Domain Name Service (DNS) is mysterious to many Windows NT administrators largely because (as you learned in Chapter 2) DNS is usually considered to be part of the network plumbing. In many organizations, one group of people manages DNS and network services while a separate group manages file, print, and application servers. It's time to lift the cloud of mystery since DNS is a critical part of Windows 2000.
Note
This chapter covers material related to installing and managing DNS for the "Install, configure, and troubleshoot DNS" and the "Manage and monitor DNS" exam objectives. "Configure a DNS client," another subobjective of this chapter's first objective, is covered in Chapter 12, "Installing and Config uring Network Clients."

Why is it so important? Active Directory depends absolutely on DNS, and many important system functions (including Kerberos authentication and finding domain controllers) are now handled through DNS lookups. Windows 2000 clients use DNS for name resolution, too, but they also use DNS to find Kerberos Key Distribution Centers (KDC), global catalog servers, and other services that may be registered in DNS.

In this chapter, you'll get a deeper understanding of how DNS works in general, plus an understanding of how to set up, configure, manage, and troubleshoot DNS in Windows 2000.

DNS Fundamentals

The Domain Name System is a hierarchically distributed database. That's a fancy way of saying that its layers are arranged in a definite order, and that its data are distributed across a wide range of machines. DNS is a standard set of protocols that defines the following:
  • A mechanism for querying and updating address information in the database
  • A mechanism for replicating the information in the database among servers
  • A schema of the database
DNS began in the early days of the Internet when the Internet was a small network created by the Department of Defense for research purposes. Host names of computers were manually entered into a file located on a centrally administered server. Each site that needed to resolve host names had to download this file. As the number of computers on the Internet grew, so did the size of this HOSTS file as did the traffic generated by the downloading of this file. The need for a new system that would offer features such as scalability, decentralized administration, and support for various data types became more and more obvious. The Domain Name System (DNS), introduced in 1984, became this new system.

With DNS, the host names reside in a database that can be distributed among multiple servers, decreasing the load on any one server and providing the ability to administer this naming system on a per-partition basis. DNS supports hierarchical names and allows registration of various data types in addition to the host-name-to-IPaddress mapping used in HOSTS files. By virtue of the DNS database being distributed, its size is unlimited and performance does not degrade much when adding more servers.

The latest version of the Windows 2000 operating system includes a new version of DNS. In addition to the features included in the Windows NT version of the DNS service, the Windows 2000 version adds support for a number of new features (described earlier in Chapter 2).

Servers, Clients, and Resolvers...Oh, My!

There are a few terms and concepts you will need to know before installing or managing a DNS server. Understanding these terms will make it easier to understand how the Windows 2000 DNS server works.
DNS Servers Any computer providing domain name services is a DNS server. That being said, not all DNS servers are alike. Earlier implementations of DNS (for example, the popular Berkeley Internet Name Domain, or BIND) were originally developed for Unix, and they handled a fairly small and simple set of RFC requirements.

There is also the concept of primary and secondary DNS servers to consider. A primary DNS server is the "owner" of the zones defined in its database. The primary DNS server has the authority to make changes to the zones it owns. Secondary DNS servers receive a read-only copy of zones. The secondary DNS server can resolve queries from this read-only copy, but cannot make changes or updates. A single DNS server may contain multiple primary and secondary zones.

Any DNS server implementation supporting Service Location Resource Records (SRV RRs, as described in an Internet Draft: "A DNS RR for specifying the location of services [DNS SRV]") and Dynamic Update (RFC2136) is sufficient to provide the name service for Windows 2000-based computers. However, because Windows 2000 DNS is designed to fully take advantage of the Windows 2000 Active Directory service, it is the recommended DNS server for any networked organization with a significant investment in Windows or extranet partners with Windows-based systems.

Clients A DNS client is any machine issuing queries to a DNS server. The client host name may or may not be registered in a name server (DNS) database. Clients issue DNS requests through processes called resolvers.

Resolvers Resolvers handle the process of mapping a symbolic name to an actual network address. The resolver (which may reside on another machine) issues queries to name servers. When a resolver receives information from name servers, it caches that information locally in case the same information is requested again.

When a name server is unable to resolve a request, it may reply to the resolver with the name of another name server. The resolver must then address a message to this new name server in the hopes that the symbolic name will be resolved.

Queries There are two types of queries that can be made to a DNS server: recursive and iterative (we'll discuss the difference shortly).

Root Servers When a DNS server processes a recursive query and that query cannot be resolved from local zone files, the query must be escalated to a root DNS server. The root server is responsible for returning an authoritative answer for a particular domain or a referral to a server that can provide an authoritative answer. Since each DNS server is supposed to have a full set of root hints (which point to root servers for various toplevel domains), your DNS server can refer queries recursively to other servers with the assistance of the root servers. You can also configure a DNS server to contain its own root zone; you might want to do so if you don't want your servers to be able to answer queries for names outside your network....

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Table of Contents

Introduction
Assessment Test
Chapter 1 Understanding Windows 2000 Networking
Chapter 2 Windows 2000 Network Naming Services
Chapter 3 Windows 2000 Connectivity & Security Services
Chapter 4 Installing and Configuring Basic Network Protocols
Chapter 5 Managing the Dynamic Host Configuration Protocol
Chapter 6 Installing and Managing Domain Name Service (DNS)
Chapter 7 Managing the Windows Internet Name Service
Chapter 8 Managing IP Routing
Chapter 9 Managing Remote Access Services
Chapter 10 Managing Virtual Private Networking
Chapter 11 Managing IP Security
Chapter 12 Installing and Configuring Network Clients
Chapter 13 Managing Network Address Translation
Chapter 14 Installing and Configuring Microsoft Certificate Server
Appendix A Practice Exam
Glossary
Index
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Sort by: Showing all of 2 Customer Reviews
  • Anonymous

    Posted November 27, 2002

    Don't buy this book...

    Don't buy this book 'cause it has a deffective CD and the publisher has yet to make a working version. They said they found out about it after it has been distributed. You have to send them your old CD including the receipt before they send you the new CD as soon as it's available. Who know when...

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  • Anonymous

    Posted July 1, 2001

    Covers just about everything for the test.

    This is probably the best book for this test. I read 3 books (Osborne, Macmillan) and this one covered the most of the test scenarios. Although the other books did cover more case study type material, I would rather know all the material and put it together for a case study instead of having the case study and not knowing the material which is how I felt with the other 216 books. Still, to pass this test you need to understand how things work and why they work that way, not just because the books say do this and do that. This test is not as hard as everyone says it is if you gather all the information you can before taking the test.

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