DNS INTERVIEW QUESTIONS AND ANSWERS
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1..What
is DNS?
Domain N ame System (DN S) is the
system that associates hostnames with IP addresses
2..What
is the use of DNS?
This technique of abstracting IP addresses
with symbolic names is called Domain Name Service (DNS)
IP-based networks, addressing and routing are
performed using IP addresses
but people have difficulty remembering
numbers so that’s why the
Domain Name System or DNS is
necessary
DNS is also used for resolving information
other than IP addresses
3..What
is the DNS bit range?
IPv4 range
is 32-bit address space and IPv6 range
is 128 bit it can support larger subnet
range
4..What
is DNS lookup?
There are different DNS lookup utilities
available from the command line. These will request a DNS server for an IP
address resolution. host and nslookup are two DNS lookup utilities.
When host is executed it will list out all of
the IP addressed attached to the domain name. nslookup is another command that
is similar to host, which can be used to query details related to DNS and
resolving of names
5..What
you mean by Unknown Host?
This can be caused by the node not being
listed in the /etc/hosts
file, failure of the DNS lookup, or a typo in
a hostname definition. You can check DNS using the nslookup command. Check all
three conditions when you get the Unknown host message.
6..What does BIND Stands for ?
BIND
stands for Berkeley Internet Name Domain
7..What
are all the components of BIND?
BIND comes with three components. The first
is the service or daemon that runs the answering side of DNS.
The second item in the BIND bundle is the resolver
library.
The third part of BIND provides tools such as
the dig command for testing DNS.
8..What
is dig?
dig is the last diagnostic utility, the queries from
DNS servers and returns the information held
about a particular domain.
9..What are
zone files in DNS server ?
Files which contain the data being served by the DNS
system are called Zone Files
10..What
are the different types of Resource Records in bind ?
NS, CNAME , MX, PTR, SOA
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