COPY: Master the Domain Name System (DNS)

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Questions and Answers

What is the purpose of DNS?

To encrypt user queries and nameserver responses
To store information about a domain name
To translate domain names to IP addresses (correct)
To delegate the right to use a domain name

What is the most common type of record stored in the DNS database?

CNAME
PTR
SOA (correct)
RP

What is a DNS resolver?

A DNS server that is authoritative for a record
The client side of the DNS that initiates and sequences queries for full resolution of the resource sought (correct)
A DNS server that queries other DNS servers on behalf of the requester
A DNS server that publishes information about a domain

What is a non-recursive query?

Provides a record for which the server is authoritative or provides a partial result without querying other servers (C) Signup and view all the answers

What is a circular dependency in DNS?

When a name server in delegations is identified by name rather than IP address (A) Signup and view all the answers

What is the purpose of DNS caching?

To reduce the load on DNS servers by caching results locally or in intermediate resolver hosts (A) Signup and view all the answers

What is a reverse DNS lookup?

A query of DNS for domain names when the IP address is known (C) Signup and view all the answers

What are Resource Records (RR) used for in DNS?

To store information about a domain name, including the IP address of the server that hosts the domain's website (D) Signup and view all the answers

What is the purpose of domain name registrars?

To delegate the right to use a domain name (A) Signup and view all the answers

Flashcards

What does DNS do?

Translates human-readable domain names (like google.com) into numerical IP addresses that computers understand.

What is an SOA record?

A type of record that holds key information about a DNS zone, including the authoritative name server for the zone.

What is a DNS resolver?

A program on your computer or network that takes your domain name requests and sends them to the DNS servers to find the corresponding IP address.

What is a non-recursive query?

A type of DNS query where the server only provides information for which it is directly responsible.