What is a DNS Server? Best Information [Updated 2020]

The full form of the DNS server is Domain Name System which performs as a phonebook of the internet. When you type a domain on the browser like “ps7dns.com” or “google.com” the DNS helps to find the correct IP addresses for those sites. A DNS contains a database of public IP addresses and their associated hostnames, it means it is a computer server.

When you type any of the website names on the browser use those addresses to communicate with the origin server of the CDN server to access website information. Then finally, there opens a website and you can saw them visually. Without the help of a DNS, it is impossible to access any website.

We’re human and we can easily remember domain name or hostname but we cannot easily remember numerical numbers. It means we cannot able to remember every sites IP addresses, so DNS helps to communicate with the server. It means when we type any sites name on the browser it opens directly website and we don’t need to remember the IP address of that site.

However, we type https://ps7dns.com the site’s IP address number 18.140.162.93. You can easily remember ps7dns.com but you can’t able to remember the IP address for a long time.

Primary DNS Server

When you type a website name into the browser a DNS server contacts the browser, application, or device to translate a human-readable hostname into an IP address. The primary DNS server contains a DNS record that has the correct IP address for the hostname. Sometimes the primary DNS server is temporarily unavailable at that time the device communicates with a secondary DNS server, containing a recent copy of the same DNS records.

There are so many cases, a primary DNS and a secondary DNS are already configured on the computer and router which you’re using. The main reasons for there are two DNS servers, in case if one DNS fails to work in this case second is used to resolve hostnames you enter.

Secondary DNS Server

Secondary DNS server also known as slaves. If you want to change the IP address for a domain name, there can be done only on the primary server which can then update secondary DNS servers. When you change the DNS server, it can be primary for one DNS zone and secondary for another DNS zone.

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How DNS Servers Resolve a DNS Query

When you want to open a website you type the website name on the browser and press enter. Then a DNS server starts to find the address which you want to visit. After pressing the enter button it sending a DNS query to several servers, and it’ll translate a different part of the domain name you entered. The different servers queried are:

1. A DNS Resolver

When you type the domain name into the browser resolver queries the root nameserver. This is the first step for a resolver to translating a human-readable domain name into IP addresses. This will help in figuring out where the site you want to go actually resides on the internet.

2. A Root Server

When the root server receives the first request it returns a result to the DNS resolver know what the address of the TLD (Top Level Domain) server that stores the information about the site.

3. A TLD Server:

The TLD server responds with the IP address of the domain’s authoritative nameserver. A top level domain is the equivlalent of the .com or .net extention of the domain name you entered into the browser’s address bar.

4. An Authoritative Name Server

Finally, the DNS resolver passes the origin server IP address back to the client. Using this IP address, the origin server will respond by sending website data that can be interpreted and displayed by the web browser. It means the DNS resolver queries this server to learn the actual IP address of the website you’re trying to visit into your browser.

What is DNS Caching?

In addition to the method outlined above, recursive resolvers also can resolve DNS queries using cached data. After retrieving the right IP address for a given website, the resolver will then store that information in its cache for a limited amount of your time. During this point period, if the other clients send requests for that name, the resolver can skip the standard DNS lookup process and easily answer the client with the IP address saved within the cache.

Once the caching deadline expires, the resolver must retrieve the IP address again, creating a replacement entry in its cache. this point limit, mentioned because the time-to-live (TTL) is about explicitly within the DNS records for every site. Typically the TTL is within the 24-48 hour range. A TTL is important because web servers occasionally change their IP addresses, so resolvers can’t serve an equivalent IP from the cache indefinitely.

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What happens when DNS servers fail?

A DNS server can fail, the reason for failing DNS server has multiple reasons like power outages cyberattacks, hardware malfunctions. Within the youth of the web, DNS server outages could have a comparatively large impact. Thankfully, today there’s tons of redundancy built into DNS, for instance, there are many instances of the basis DNS servers and TLD nameservers, and most ISPs have backup recursive resolvers for his or her users. (Individual users also can use public DNS resolvers, like Google’s DNS server 8.8.8.8) hottest websites even have multiple instances of their authoritative nameservers.

In the case of a serious DNS server outage, some users may experience delays thanks to the number of requests being handled by backup servers, but it might take a DNS outage of very large proportions to form a big portion of the web unavailable. (This actually happened in 2016 when DNS provider Dyn experienced one among the most important DDoS attacks in history).

Reasons to Use Secondary DNS

The main reason to use the secondary DNS is for backup purposes. Sometimes the primary DNS failed, at that moment when the primary DNS is failed, the secondary DNS server communicate with the browser and start work. Nowadays there are so many managed DNS server providers in the market, they provide multiple nameserver IPs to use. These types of DNS server providers are architected to provide inherent redundancy and high availability.

How to Obtain Internet Server Information

To check the DNS of your domain, you can use CMD with nslookup on your Windows PC. To check is follow the below instructions:

  • Open CMD on your PC
  • Then type nslookup ps7dns.com (example.com or your domain name or type the domain name which domain’s you want to check DNS)

Some domain show multiple IP addresses, in this case those domains are translates too.

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Frequently Asked Questions on What is a DNS Server?

  1. How do I fix a DNS server problem?

    To fix a DNS server problem you need to do correct your DNS server, clear DNS cache and reset your IP, update your network adapter driver, restart your modem or router.

  2. What is a DNS server used for?

    To translate human-readable hostname into an IP address. DNS server communicates with the device and then the site which you typed on your browser is opened.

  3. How do I find my DNS server?

    Open command prompt and type “ipconfig /all” and press enter.

  4. What is a DNS server and what is its purpose?

    DNS (Domain Name System) server is phonebook for the internet. Humans cannot able to remember IP address but they can remember domain names.

  5. Can I use 8.8 8.8 DNS?

    Yes, of course you can use it. This is Google DNS and it’s trusted.

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