Domain Name System (DNS), computer Networks

Hello friends. We are gate smashers. DNS is the subject. Domain Name System. Domain Name System. Let’s take, for example, Google Facebook YouTube.

Are we allowed to add IP addresses? Domain names are always entered. This is because we can easily recall names and names with our minds.

Capturing numbers is more difficult than it sounds. I have written an example of an IP address. Do you ever discuss this or any other IP address with your friends or family?

Is of Crick info I am a fan of cricket and this is the IP address of crickinfo.com. We never use IP addresses, so we always use domain names.

Domain systems that allow users to remember domain names so that they can search any website easily.

It is not true that you can search for anyone with a number. We remember the person name, and then we search alphabetically in the phone book or dictionary to find the value. The second reason to use DNS is that it allows you to access your IP address.

They are dynamic and never static.

And hosted or hosting is when you get your IP address. However, everyone will search you using which name? They will search you using xyz name and not your IP address. For example, let’s suppose that after 1-2 year, you or Amazon decided to.

Shift to another IP or Amazon seems too costly, so you choose to use any other web app or other web provider, let’s say GoDaddy. When you move to another web program, your database will still be the same, so your website name will remain.

Everybody remembers you with your name xyz, not your IP address. Your IP address is changed in this instance, but your name remains unchanged. If you want to change the name of the website from xyz or abc, you will need to start a new business because everyone knows you by name.

Xyz, so here IP addresses are changing from backend, but the name domain database remains the same. Yes, it keeps on updating, but the domain name should stay the same.

These are the main reasons to use DNS. Next, let’s talk about how you search for domain names. Let’s say I open a browser in my system.

When I clicked on the browser, I typed crickinfo.com. Now I see that I have entered a domain name. This will cause this domain name to be mapped with an IP address. It is not my responsibility.

We have this architecture for this purpose.

To root server, It also has 2 options. This can be iterative, recursive, or iterative. So the first request goes to root servers, or it works as a middleman.

Resolver works to resolve Domain names into IP addresses. Root servers will be requested first.

Your request will be routed to root server first. Root server will then give you an IP address.

Generic server level, or country server level for the domain you searched crickinfo.com. In this case, it will resolve from right to left, which means that it resolves from backsides.

This is the.com non-profit commercial organization. In India, we use it for military and education. There are many domains so that your request will be forwarded to the right server.

We will forward the request to.com servers.

You can also go to this link to see if you don’t need to stop. These.com servers do not consist of a single server. They are many servers, so load balancing can easily be done after.com from the second level.

Authoritative level Authoritative server are servers that store all IP addresses and names is crick info.

If an IP address is stored in an authoritative server, it could also be that crick info has multiple IP addresses, like YouTube or Google. These are high-level organizations and cannot work with a single server like Facebook.

Facebook has only about 70,000 servers. This means that there may be multiple IP addresses. An authoritative server will select one of these IP addresses, and you can search for it to see how your request is being handled.

First sent to resolver root server asking resolver if he can move to commercial.

Move to authoritative Server

Now, your name is mapped using IP.

Your data will then come from there.

How does DNS work? What are the components of hierarchical architecture?

This is not required because we don’t need it. Our ISP internet service provider is responsible. It always keeps cache memory, meaning that it stores in cache memory your request.

It will be sent to root server the next time. The ISP will then store it so that the next time you request it doesn’t take as long and get resolved quickly.

Next video will discuss iterative and recursive modes. Here are the reasons why DNS is used.

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