DNS serves a to resolve a name to an IP, so visitors know where are you hosted. The common records found in DNS are A, MX, CNAME, and TXT. They are responsible for your website and emails. There are free ones and paid ones, any differences? In general, they serve the same purposes. However, you carefully examine, they are different.
DNS is the core of your website and emails deliveries. Without a DNS, your website will stop and your email cannot be delivered even yours servers are working. Many, either do not know what is DNS or neglected the importantness of a DNS.
The keyword is ‘anycast’. Generally, all DNS is round-robin and domain names must have 2 DNS, in the event if one has failed, your website and emails will still work. However, the smaller web hosting providers have only 1 DNS but 2 IP addresses binded to the same DNS. This is wrong, if DNS stopped, all your websites and emails use these DNS stopped too. So, it is important to have 2 working DNS at least. Today, DNS records are more sophisticated. They are used by many services and served globally, this is why internet in the 1st place. Thus, anycast DNS usually a paid service has become common and important internet service.
What is anycast? Anycast DNS is a traffic routing algorithm used for the speedy delivery of website content that advertises individual IP addresses on multiple nodes. User requests are directed to specific nodes based on such factors as the capacity and health of your server, as well as the distance between it and the website visitor.
There are a few advantages using anycast DNS.:
- Faster connections – Routing users through the nearest intermediary node minimizes round-trip time (RTT), thereby decreasing the number of hops and reducing latency.
- Simplified server configuration – Anycast lets a single DNS server configuration be distributed to all of your network nodes.
- High availability – Advertising an IP address on multiple nodes creates redundancy, thereby providing backup in the event a node becomes overloaded or fails.
- DDoS mitigation – Anycast provides intrinsic DDoS mitigation by offering failover alternatives if a node is attacked or goes down.
After reading, we understand how important is a DNS. And we use what kind of DNS to make sure our website and emails remain reachable around the world.