Address Resolution Protocol (ARP)
Used to map a known IP address to an unknown MAC address.
Application Layer
Top-most layer of the OSI model where DHCP and other network applications function.
authorize
Process of enabling an Active Directory DHCP server to provide DHCP services to clients
automatic restores
Restores performed by a DHCP server whenever database corruption is detected.
available address pool
List of TCP/IP addresses within a DHCP scope that can be distributed to DHCP clients
checkpoint file
Indicates the last information that was successfully written to a JET database.
class options
DHCP options applied based on type, whether vendor classes or user classes.
compacted
To optimize a DHCP database to reclaim unused space created by deleted records.
DHCPACK
Sent by a DHCP server to acknowledge the client’s acceptance of a DHCP lease.
DHCPDECLINE
Sent by a DHCP client to a DHCP server to indicate that it is not accepting a DHCP lease that was sent by a DHCPOFFER message.
DHCPDISCOVER
Broadcast-based DHCP message used by clients to locate available DHCP servers.
DHCPINFORM
DHCP message used to detect rogue DHCP servers.
DHCPNACK
Sent by a DHCP server to deny a client’s DHCPREQUEST message.
DHCPOFFER
Broadcast-based DHCP message used by DHCP servers to offer IP address information to a requesting client.
DHCPRELEASE
Sent by a DHCP client to relinquish an IP address and cancel the remaining lease.
DHCPREQUEST
Used by a DHCP client to signal acceptance of a DHCP lease that was sent by a DHCPOFFER message.
exclusion range
Portion of an IP address range that will not be distributed to DHCP clients by a DHCP server
Joint Engine Technology (JET)
Database format used by the DHCP database.
Media Access Control (MAC)
Hard-coded hexadecimal address configured for each Network Interface Card (NIC).
multinets
Multiple logical subnets contained within a single network.
Open System Interconnection (OSI)
A model for network communications consisting of seven layers from Physical to Application.
reconciliation
Process of verifying the contents of the DHCP database against the DHCP Registry values.
Request for Comments (RFC)
Documents released by the IETF to define protocols, such as FTP and LDAP.
reservations
Configures a consistent IP address for a DHCP-enabled host.
rogue DHCP server
DHCP server that has not been authorized within Active Directory.
superscope
Administrative grouping of multiple contiguous DHCP scopes.
T1
Represents half of the DHCP lease time.
T2
Represents 87.5% of the DHCP lease time.
Trivial File Transfer Protocol (TFTP)
Lightweight version of FTP that uses UDP traffic rather than TCP.
User Datagram Protocol (UDP)
Connectionless, non-acknowledgement?based TCP/IP protocol used for low-overhead communication.

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