NEST-208 Configuring DNS Servers UNIT 2 Exam-Questions with
Correct Answers/ Verified/ Latest 2024/2025
Domain Name System (DNS) - ✔✔A hierarchical system for naming resources on the
Internet.
fully qualified domain name (FQDN) - ✔✔The full domain name for a host that specifically
identifies it within the hierarchy of the Domain Name System.
DNS namespace - ✔✔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 - ✔✔A DNS server that keeps a database of addresses of other DNS servers
managing top-level domain names.
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.
Hostnames - ✔✔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 - ✔✔A grouping of DNS information that represents one or more domains and possibly
subdomains.
resource records - ✔✔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 - ✔✔A computer making a DNS query
, DNS resolver - ✔✔A DNS client that sends a recursive query to a DNS server
iterative query - ✔✔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 - ✔✔(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 - ✔✔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 - ✔✔A DNS server that holds a complete copy of a zone's resource
records (typically a primary or secondary zone).
forwarder - ✔✔A DNS server to which other DNS servers send requests they can't resolve
themselves.
conditional forwarder - ✔✔A DNS server to which other DNS servers send requests targeted
for a specific domain.
caching-only DNS server - ✔✔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) - ✔✔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.
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.
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