DNS

Dynamic Name Service, a network service that can resolve Domain Names to current IP Addresses.

In order to prevent a DNS Server to be hit for each and every request, a Domain Name is typically resolved once using a DNS Server, and the result is then Cached. For how long depends on the record’s TTL.

There are a few different types of records, each of which have different meanings, among which:

• A, returns a IPv4 address.
• AAAA, returns an IPv6 address.
• CNAME, points to another domain name (which results in a new DNS request for the name that is returned).
• MX, for Email.
• NS, to point to other DNS Servers.

​​ Sources

• https://www.ietf.org/rfc/rfc1035.txt Open external link
• https://en.wikipedia.org/wiki/List_of_DNS_record_types Open external link