Exam (elaborations)
NEST-208 Configuring DNS Servers UNIT 2 Exam
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NEST-208 Configuring DNS ServersUNIT 2 Exam
Domain Name System (DNS) - ANSWER A hierarchical system for
naming resources on the Internet.
fully qualified domain name (FQDN) - ANSWER The full domain name
for a host that specifically identifies it within the hierarchy of the Domain
Name System.
DNS namespace - ANSWER The entire DNS tree that defines the
structure of the names used to identify resources in network domains. It
consists of a root name (defined as a period), top-level domains,
second-level domains, optionally one or more subdomains, and
hostnames separated by periods.
root system - ANSWER A DNS server that keeps a database of
addresses of other DNS servers managing top-level domain names.
top-level domain (TLD) servers - ANSWER 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.
Hostnames - ANSWER An assigned name that is associated with an IP
address, so when a client looks up the name www.microsoft.com, the
DNS server returns an IP address.
zone - ANSWER A grouping of DNS information that represents one or
more domains and possibly subdomains.
resource records - ANSWER Data in a DNS database containing
information about network resources, such as hostnames, other DNS
servers, and services; each record is identified by a letter code.
, DNS client - ANSWER A computer making a DNS query
DNS resolver - ANSWER A DNS client that sends a recursive query to a
DNS server
iterative query - ANSWER A type of DNS query to which a DNS server
responds with the best information it has to satisfy the query. The DNS
server doesn't query additional DNS servers in an attempt to resolve the
query.
refferal - ANSWER (1) A response to an iterative query in which the
address of another name server is returned to the requester.
(2) A prioritized list of servers used to access files in a namespace.
recursive query - ANSWER 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.
authoritative server - ANSWER A DNS server that holds a complete
copy of a zone's resource records (typically a primary or secondary
zone).
forwarder - ANSWER A DNS server to which other DNS servers send
requests they can't resolve themselves.
conditional forwarder - ANSWER A DNS server to which other DNS
servers send requests targeted for a specific domain.
caching-only DNS server - ANSWER A DNS server with no zones. Its
sole job is to field DNS queries, do recursive lookups to root servers, or
send requests to forwarders, and then cache the results.
forward lookup zone (FLZ) - ANSWER A DNS zone containing records
that translate names to IP addresses, such as A, AAAA, and MX
records. It's named after the domain whose resource records it contains.
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