DNS

Question 1

What is the primary purpose of DNS?

Answer 1

To translate domain names into IP addresses.

Question 2

What are the main components of DNS?

Answer 2

DNS clients (resolvers), DNS servers, and DNS records.

Question 3

What is a DNS resolver?

Answer 3

A DNS resolver is a client-side application that queries DNS servers to resolve domain names to IP addresses.

Question 4

What is a DNS server?

Answer 4

A DNS server is a server that responds to DNS queries, providing the IP address associated with a domain name.

Question 5

What are the types of DNS servers?

Answer 5

A: Recursive DNS servers, authoritative DNS servers, and root DNS servers.

Question 6

What is a recursive DNS server?

Answer 6

A server that performs the complete process of resolving a domain name by querying multiple authoritative DNS servers if necessary.

Question 7

What is an authoritative DNS server?

Answer 7

A server that holds the definitive records for a domain and responds to queries for that domain.

Question 8

What is a root DNS server?

Answer 8

A server at the top of the DNS hierarchy that directs queries to appropriate top-level domain (TLD) servers.

Question 9

What are DNS records?

Answer 9

Entries in a DNS database that provide information about a domain, including IP addresses and mail server addresses.

Question 10

What is an A record?

Answer 10

An address record that maps a domain name to an IPv4 address.

Question 11

What is an AAAA record?

Answer 11

An address record that maps a domain name to an IPv6 address.

Question 12

What is a CNAME record?

Answer 12

A canonical name record that maps an alias name to a true (canonical) domain name.

Question 13

What is an MX record?

Answer 13

A mail exchange record that specifies the mail server responsible for receiving email for a domain.

Question 14

What is a PTR record?

Answer 14

A pointer record that maps an IP address to a domain name (reverse DNS lookup).

Question 15

What is an NS record?

Answer 15

A name server record that indicates which DNS server is authoritative for a domain.

Question 16

What is a TXT record?

Answer 16

A text record used to store text information, often for verification purposes.

Question 17

What is a SOA record?

Answer 17

A start of authority record that provides information about the DNS zone and the authoritative DNS server for that zone.

Question 18

What is a DNS zone?

Answer 18

A portion of the DNS namespace that is managed by a specific organization or administrator.

Question 19

What is zone transfer in DNS?

Answer 19

The process of copying DNS zone data from a primary DNS server to a secondary DNS server.

Question 20

What are the two types of zone transfers?

Answer 20

Full zone transfer (AXFR) and incremental zone transfer (IXFR).

Question 21

What is DNS caching?

Answer 21

The temporary storage of DNS query results to reduce the load on DNS servers and improve response times.

Question 22

What is TTL in DNS?

Answer 22

Time to Live; a value that specifies how long a DNS record should be cached before being discarded or refreshed.

Question 23

What is a DNS query?

Answer 23

A request made by a DNS client to resolve a domain name to an IP address.

Question 24

What is the difference between a forward lookup and a reverse lookup in DNS?

Answer 24

A forward lookup translates a domain name to an IP address, while a reverse lookup translates an IP address to a domain name.

Question 25

What is DNSSEC?

Answer 25

DNS Security Extensions; a suite of specifications to secure information provided by DNS by ensuring its authenticity and integrity.

Question 26

What is a FQDN?

Answer 26

Fully Qualified Domain Name; the complete domain name for a specific computer or host on the internet.

Question 27

What is the function of the BIND software in DNS?

Answer 27

Berkeley Internet Name Domain (BIND) is the most widely used DNS software on the internet.

Question 28

What is a split-horizon DNS?

Answer 28

A DNS configuration where two different DNS responses are provided for the same query based on the source of the query.

Question 29

What is a Domain Registrar?

Answer 29

An organization that manages the reservation of domain names. Examples include GoDaddy, Namecheap, and Google Domains.

Question 30

What is a Web Host?

Answer 30

A service provider that offers storage space and access for websites. Examples include Bluehost, SiteGround, and Vercel.

Question 31

What is a Nameserver?

Answer 31

A server that handles queries about the location of a domain name's services. It translates domain names into IP addresses.

Question 32

Is a DNS resolver part of the browser?

Answer 32

No, a DNS resolver is not part of the browser. The browser initiates DNS queries, which are handled by the client-side stub resolver and then forwarded to a recursive DNS resolver to resolve domain names to IP addresses.