Chapter 11 Terminology

lease renewal

The process of a DHCP client renewing its IP address lease by using unicast DHCPREQUEST messages.

DHCP filter

A DHCP server feature that allows administrators to restrict which computers on a network are leased IP addresses.

conflict detection

A DHCP server property that causes the DHCP server to attempt to ping an IP address before it's offered to a client to make sure the address isn't already in use.

Dynamic Host Configuration Protocol (DHCP)

A component of the TCP/IP protocol suite used to assign an IP address to a host automatically from a defined pool of addresses.

User Class

A custom value you create on the DHCP server and then configure on a DHCP client; used much like the Vendor Class value.

DHCP relay agent

A device that listens for broadcast DHCPDISCOVER and DHCPREQUEST messages and forwards them to a DHCP server on another subnet.

split scope

A fault-tolerant DHCP configuration in which two DHCP servers share the same scope information, allowing both servers to offer DHCP services to clients.

Preboot Execution Environment (PXE)

A network environment built into many NICs that allows a computer to boot from an image stored on a network server.

DHCP policies

A new feature in Windows Server 2012 that gives administrators more fine-tuned control over address lease options with conditions based on criteria.

lease duration

A parameter of a DHCP IP address lease that specifies how long a DHCP client can keep an address.

DHCP scope

A pool of IP addresses and optionally other IP configuration parameters from which a DHCP server leases addresses to DHCP clients. DHCP server authorization The process of enabling a DHCP server in a domain environment to prevent rogue DHCP servers from operating on the network.

exclusion range

A range of addresses in the scope that the DHCP server doesn't lease to clients.

superscope

A special type of scope consisting of one or more member scopes; it allows a DHCP server to service multiple IP subnets on a single physical network.

Vendor Class

A field in the DHCP packet that device manufacturers or OS vendors can use to identify a device model or an OS version.

reservation

An IP address associated with a DHCP client's MAC address to ensure that when the client requests an IP address, it always gets the same one, along with any configured options.