We have already talked about what is DNS and what is a Secondary DNS, this time we will focus on the Primary DNS server. There is a DNS hierarchy in which the Primary DNS server is taking the central spot. It has the latest and full information, in comparison with lower level DNS servers who has just a cache of this information and with an expiry period.
TTL – Time to live is a value that signifies how long should the data be kept before discarding. It is commonly used in computers. In the Domain Name System, it has a value in seconds (86 400 for a day, 43 200 for 12 hours and so on) that shows for how long, should a record be kept locally, before you need to make a new query to get this information. The TTL is set separately for the different records. They are set in the authoritative DNS server and the recursive DNS will keep the information depending on the predetermined time. This process of temporary having the record is called caching and the temporary stored data – DNS cache.
For many years already, the Unicast protocol has been outdated for the purpose of fast and secure DNS. It can’t manage with massive DDoS attacks, can’t handle load balancing in different locations, and it is quite slow for a global presence. But don’t get desperate, a new technology is there to help you out.
So what can you use to provide fast and reliable DNS?
Anycast DNS is here to step in. It is by far superior technology! It reduces latency, give extra security and minimize downtime.
DNS – domain name system is a marvelous invention. It makes it easy for all of us to enter our favorite addresses on the web. We don’t need to remember thousands of IP numbers of all websites that we use; we simply write the domain name and the DNS magically matches our text with the associated IP and show us the result.
Anycast DNS is one amazing technology that can save you a lot of time.
But first, let’s explain it to you in a simple way so you really understand why this can help you with your company network.
What is a DNS server?
Imagine it as a massive phone book. They contain a register of domain names and translate them to IP (internet protocol) addresses. For us humans it is easy to remember the domain names but the computers, they prefer numbers to orientate so they access websites based on their IPs.
The information of those DNS servers is saved and organized in the Central Registry. Internet providers and Host companies need to check with the Central Registry to get all the DNS updates.
When you write the following web address www.facebook.com, your service provider will check the DNS for this website, then translate to machine language and direct you to the following IP 184.108.40.206.