DNS Records

Question 1

A Records

Answer 1

▪ Address Record
▪ Used to link a hostname to an IPv4 address
▪ A records work for IPv4 addresses
▪ AAAA records work for IPv6 addresses

Question 2

CNAME

Answer 2

▪ Canonical Name Record
▪ Used instead of a A record or AAAA record if you want to point a domain to another domain name or subdomain

Question 3

MX Record

Answer 3

▪ Mail Exchange Record
▪ Used to direct emails to a mail serve
▪ Used to indicate how email messages should be routed using the Simple
Mail Transfer Protocol, or SMTP, over port 25
▪ Can only be used to point to another domain, not an IP address

Question 4

SOA Record

Answer 4

Start of Authority Record
▪ Used to store important information about a domain or zone

Question 5

DNS zone transfer

Answer 5

▪ The process of sending DNS records data from the primary nameserver to a secondary name server
▪ Uses the TCP protocol to transfer the data to ensure data is successfully sent by the primary server and received by the second server

Question 6

PTR Records

Answer 6

▪ Pointer Records
▪ Used to correlate an IP address with a domain name
▪ The opposite of an A record
▪ Always stored under the .arpa (top-level domain)

Question 7

TXT Record

Answer 7

Text records
Used by domain administrators to add text into the domain name system or DNS
A place to store machine-readable data

Question 8

SRV Records

Answer 8

▪ Service Record
▪ Used to specify a host and port for a specific service
▪ Can specify a port along with our IP address

Question 9

NS Record

Answer 9

▪ Name Server Record
▪ Used to indicate which DNS name server is the authoritative one for a domain