Configuring DNS for Active Directory - MCTS Guide to Microsoft Windows Server 2008 Active Directory Configuration - page 392

primary zone A DNS zone containing a read/write master copy of all resource records for
the zone; this zone is authoritative for the zone.
recursive query A query in which the DNS server processes the query until it responds with
an address that satisfies the query or with an “I don't know” message. The process might
require the DNS server to query several additional DNS servers.
referral A response to an iterative query in which the address of another name server is
returned to the requester.
resolver A DNS client that sends a recursive query to a DNS server.
resource record Data in a DNS database that contains information about network resources,
such as hostnames, other DNS servers, and services, and is identified by a letter code.
reverse lookup zone (RLZ) A DNS zone containing PTR records that map IP addresses to
names; it's named with the IP network address (IPv4 or IPv6) of the computer whose records it
contains.
root hints A list of name servers preconfigured on Windows DNS servers that point to
Internet root servers, which are DNS servers located on the Internet and managed by IANA.
root servers DNS servers that keep a database of addresses of other DNS servers managing
top-level domain names.
round robin A method of responding to DNS queries when more than one IP address exists
for the queried host. Each IP address is placed first in the list of returned addresses an equal
number of times so that hosts are accessed alternately.
scavenging A process whereby the DNS server checks the zone file for stale records
periodically and deletes those meeting the criteria for a stale record.
secondary zone A DNS zone containing a read-only copy of all resource records for the
zone. Changes can't be made directly on a secondary DNS server, but because it contains an
exact copy of the primary zone, it's considered authoritative for the zone.
standard zone A primary, secondary, or stub zone that isn't Active Directory integrated.
stub zone A DNS zone containing a read-only copy of only the zone's SOA and NS records
and the necessary A records to resolve NS records. A stub zone forwards queries to a primary
DNS server for that zone and is not authoritative for the zone.
top-level domain (TLD) servers DNS servers that maintain addresses of other DNS servers
that are authoritative for second-level domains that use the top-level domain. For example,
a TLD server for the com top-level domain contains NS records for authoritative DNS servers
for all domains ending in .com.
zone A grouping of DNS information that represents one or more domains and possibly
subdomains.
zone delegation The transfer of authority for a subdomain to a new zone, which can be on
the same server as the parent zone or on another server.
zone transfer An operation that copies all or part of a zone from one DNS server to another
and occurs as a result of a secondary server requesting the transfer from another server.

Review Questions
1. Which of the following best describes DNS? (Choose all that apply.)
a. Hierarchical database
b. Flat database
c. Monolithic database
d. Distributed database
2. Which of the following accurately represents an FQDN?
a. host.top-level-domain.subdomain.domain

b. domain.host.top-level-domain