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Network > DNS > Flashcards

DNS Flashcards

1
Q

What is the primary purpose of DNS?

A

To translate domain names into IP addresses.

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2
Q

What are the main components of DNS?

A

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

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3
Q

What is a DNS resolver?

A

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

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4
Q

What is a DNS server?

A

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

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5
Q

What are the types of DNS servers?

A

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

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6
Q

What is a recursive DNS server?

A

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

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7
Q

What is an authoritative DNS server?

A

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

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8
Q

What is a root DNS server?

A

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

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9
Q

What are DNS records?

A

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

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10
Q

What is an A record?

A

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

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11
Q

What is an AAAA record?

A

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

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12
Q

What is a CNAME record?

A

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

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13
Q

What is an MX record?

A

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

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14
Q

What is a PTR record?

A

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

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15
Q

What is an NS record?

A

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

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16
Q

What is a TXT record?

A

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

17
Q

What is a SOA record?

A

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

18
Q

What is a DNS zone?

A

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

19
Q

What is zone transfer in DNS?

A

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

20
Q

What are the two types of zone transfers?

A

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

21
Q

What is DNS caching?

A

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

22
Q

What is TTL in DNS?

A

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

23
Q

What is a DNS query?

A

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

24
Q

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

A

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

25
Q

What is DNSSEC?

A

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

26
Q

What is a FQDN?

A

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

27
Q

What is the function of the BIND software in DNS?

A

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

28
Q

What is a split-horizon DNS?

A

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

29
Q

What is a Domain Registrar?

A

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

30
Q

What is a Web Host?

A

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

31
Q

What is a Nameserver?

A

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

32
Q

Is a DNS resolver part of the browser?

A

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.

Network (1 decks)

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