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11
IMPLEMENTING DHCPIMPLEMENTING DHCP
Chapter 1Chapter 1
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 22
HISTORY OF DHCPHISTORY OF DHCP
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 33
THE ROLE OF DHCPTHE ROLE OF DHCP
Dynamically assigns TCP/IP addresses
Dynamically assigns TCP/IP configuration information
Simplifies network administration
Dynamically assigns TCP/IP addresses
Dynamically assigns TCP/IP configuration information
Simplifies network administration
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 44
DYNAMIC VERSUS MANUAL TCP/IP ADDRESS ASSIGNMENTDYNAMIC VERSUS MANUAL TCP/IP ADDRESS ASSIGNMENT
MMaannuuaall TTCCPP//IIPP CCoonnffiigguurraattiioonn AAuuttoommaattiicc TTCCPP//IIPP CCoonnffiigguurraattiioonn
IP addresses entered manuallyon each client computer
IP addresses are supplied auto-matically to client computers
Possibility of entering incorrector invalid IP address
Ensures that client always usescorrect configuration information
Incorrect configuration canlead to communicationand network issues
Client configuration updatedautomatically to reflect network
changes
Administrative overload onnetworks on which computersare frequently moved
Elimination of source of networkproblems
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 55
MANUAL TCP/IP ADDRESSINGMANUAL TCP/IP ADDRESSING
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 66
DYNAMIC TCP/IP ADDRESS ASSIGNMENTDYNAMIC TCP/IP ADDRESS ASSIGNMENT
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 77
DHCP SERVER REQUIREMENTSDHCP SERVER REQUIREMENTS
DHCP server requirements Microsoft Windows NT, Windows 2000, or
Windows Server 2003 Server products
The DHCP Server service installed on the server
Static IP address, subnet mask, and default gateway
Valid range of addresses
DHCP server requirements Microsoft Windows NT, Windows 2000, or
Windows Server 2003 Server products
The DHCP Server service installed on the server
Static IP address, subnet mask, and default gateway
Valid range of addresses
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 88
DHCP CLIENT REQUIREMENTSDHCP CLIENT REQUIREMENTS
DHCP client requirements Windows XP or Windows 2000
Microsoft Windows NT 3.51 or later
Microsoft Windows 95 or Microsoft Windows 98
Microsoft Windows 3.11 for Workgroups with TCP/IP-32
Microsoft Network Client 3 for MS-DOS
LAN Manager 2.2c
Other non-Microsoft operating systems
DHCP client requirements Windows XP or Windows 2000
Microsoft Windows NT 3.51 or later
Microsoft Windows 95 or Microsoft Windows 98
Microsoft Windows 3.11 for Workgroups with TCP/IP-32
Microsoft Network Client 3 for MS-DOS
LAN Manager 2.2c
Other non-Microsoft operating systems
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 99
KEY BENEFITS OF DHCPKEY BENEFITS OF DHCP
Centralized administration of IP configuration
Dynamic host configuration
Seamless IP host configuration
Flexibility
Scalability
Centralized administration of IP configuration
Dynamic host configuration
Seamless IP host configuration
Flexibility
Scalability
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1010
HOW THE DHCP PROCESS WORKSHOW THE DHCP PROCESS WORKS
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1111
DHCP MESSAGE TYPESDHCP MESSAGE TYPES
Used by clients to obtain additional TCP/IP addresses
DDHHCCPP MMeessssaaggee TTyyppee DDeessccrriippttiioonn
DHCPDISCOVERUsed by clients to request configuration parametersfrom a DHCP server
DHCPOFFER Used by servers to offer IP addresses to requestingclients
DHCPREQUESTUsed by clients to accept or renew IP addressassignment and to decline unaccepted servers
DHCPDECLINE Used by clients to reject an offered IP address
DHCPACK Used by servers to acknowledge a client’sacceptance of an offered IP address
DHCPNACK Used by servers to reject a client’s acceptance of anoffered IP address
DHCPRELEASE Used by clients to terminate an IP address lease
DHCPINFORM
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1212
THE INITIAL DHCP LEASE PROCESSTHE INITIAL DHCP LEASE PROCESS
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1313
DHCP LEASE RENEWAL PROCESSDHCP LEASE RENEWAL PROCESS
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1414
WHAT HAPPENS WHEN A CLIENT CHANGES SUBNETS?WHAT HAPPENS WHEN A CLIENT CHANGES SUBNETS?
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1515
WHAT IS A DHCP RELAY AGENT?WHAT IS A DHCP RELAY AGENT?
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1616
HOW DOES AUTOMATIC PRIVATE IP ADDRESSING (APIPA) WORK?HOW DOES AUTOMATIC PRIVATE IP ADDRESSING (APIPA) WORK?
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1717
ALTERNATE TCP/IP ADDRESS CONFIGURATIONALTERNATE TCP/IP ADDRESS CONFIGURATION
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1818
AUTHORIZING A DHCP SERVER IN ACTIVE DIRECTORYAUTHORIZING A DHCP SERVER IN ACTIVE DIRECTORY
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 1919
WHAT IS A DHCP SCOPE?WHAT IS A DHCP SCOPE?
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2020
DHCP ADDRESS EXCLUSIONSDHCP ADDRESS EXCLUSIONS
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2121
MULTICAST ADDRESS CONFIGURATION USING DHCPMULTICAST ADDRESS CONFIGURATION USING DHCP
The multicast address range is 224.0.0.0 through 239.255.255.255.The multicast address range is 224.0.0.0 through 239.255.255.255.
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2222
DHCP LEASE DURATIONDHCP LEASE DURATION
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2323
WHAT ARE DHCP CLIENT RESERVATIONS?WHAT ARE DHCP CLIENT RESERVATIONS?
Client reservations permanently reserve a specific address for a specific client.Client reservations permanently reserve a specific address for a specific client.
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2424
WHAT ARE DHCP SCOPE OPTIONS?WHAT ARE DHCP SCOPE OPTIONS?
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2525
VERIFYING DHCP SCOPE OPTIONSVERIFYING DHCP SCOPE OPTIONS
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2626
ACTIVATING A DHCP SCOPEACTIVATING A DHCP SCOPE
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2727
HOW TO CONFIGURE A DHCP RELAY AGENTHOW TO CONFIGURE A DHCP RELAY AGENT
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2828
WHAT ARE DHCP SUPERSCOPES?WHAT ARE DHCP SUPERSCOPES?
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 2929
SUPERSCOPES WITH REMOTE NETWORKSSUPERSCOPES WITH REMOTE NETWORKS
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 3030
MULTIPLE DHCP SERVERS ON THE SAME SUBNETMULTIPLE DHCP SERVERS ON THE SAME SUBNET
Chapter 1: IMPLEMENTING DHCPChapter 1: IMPLEMENTING DHCP 3131
SUMMARYSUMMARY
Advantages and disadvantages of DHCP
How to install and configure DHCP
DHCP in an Active Directory network
Scopes and superscopes
DHCP in a routed network
Advantages and disadvantages of DHCP
How to install and configure DHCP
DHCP in an Active Directory network
Scopes and superscopes
DHCP in a routed network