Route 53

Question 1

What’s an A record type used for?

Answer 1

Routes traffic to a resource, such as a web server, using an IPv4 address in dotted decimal notation.

Question 2

What’s an AAAA record type used for?

Answer 2

Routes traffic to a resource, such as a web server, using an IPv6 address in colon-separated hexadecimal format.

Question 3

What’s a CAA record type used for?

Answer 3

Specifies which certificate authorities (CAs) are allowed to issue certificates for a domain or subdomain.

Question 4

What’s a CNAME record type used for?

Answer 4

Maps DNS queries for the name of the current record, such as acme.example.com, to another domain (example.com or example.net) or subdomain (acme.example.com or zenith.example.org).

Question 5

What’s a DS record type used for?

Answer 5

Delegation signer (DS) record - used to establish a chain of trust when you configure DNSSEC signing

Question 6

What’s an MX record type used for?

Answer 6

An MX record specifies the names of your mail servers and, if you have two or more mail servers, the priority order. Each value for an MX record contains two values, priority and domain name.

Question 7

What’s an NAPTR record type used for?

Answer 7

Name Authority Pointer - commonly used for applications in Internet telephony, for example, in the mapping of servers and user addresses in the Session Initiation Protocol (SIP)

Question 8

What’s an NS record type used for?

Answer 8

An NS record identifies the name servers for the hosted zone. Note the following:

• The most common use for an NS record is to control how internet traffic is routed for a domain. To use the records in a hosted zone to route traffic for a domain, you update the domain registration settings to use the four name servers in the default NS record. (This is the NS record that has the same name as the hosted zone.)

You can create a separate hosted zone for a subdomain (acme.example.com) and use that hosted zone to route internet traffic for the subdomain and its subdomains (subdomain.acme.example.com). You set up this configuration, known as “delegating responsibility for a subdomain to a hosted zone” by creating another NS record in the hosted zone for the root domain (example.com). For more information, see Routing traffic for subdomains.

You also use NS records to configure white-label name servers. For more information, see Configuring white-label name servers.

Question 9

What’s an PTR record type used for?

Answer 9

A PTR record maps an IP address to the corresponding domain name (opposite of A/AAAA record).

Question 10

What’s an SOA record type used for?

Answer 10

A start of authority (SOA) record provides administrative information (incl. admin email) about a domain and the corresponding Amazon Route 53 hosted zone.

Question 11

What’s an SPF record type used for?

Answer 11

Were formerly used to verify the identity of the sender of email messages. Not recommended to be used anymore.

Question 12

What’s an SRV record type used for?

Answer 12

Service record - defines host name for accessing services, such as a service for email or communications.

Question 13

What’s an TXT record type used for?

Answer 13

Lets a domain administrator enter text into the Domain Name System (DNS). The TXT record was originally intended as a place for human-readable notes. However, now it is also possible to put some machine-readable data into TXT records. One domain can have many TXT records.

Question 14

How often do health checks run by default?

Answer 14

Every 30 seconds (every 10 seconds costs extra)

Question 15

What protocols are supported by health checks?

Answer 15

TCP, HTTP/HTTPS (incl. String Matching)