DNS TECHNOLOGY NETWORK
In the world of networking, computers don't go by names like humans do, they go
By the numbers, because that's how computers
And other similar devices talk and
Identify with each other over a network,
Which is by using numbers such as IP
Addresses.Humans on the other hand are
accustomed to using names instead of
numbers,
whether is talking directly to another
person or identifying a country,
place, or thing, humans identify with
names instead of numbers.So in order to bridge the communication gap between computers and humans and make the communication of a lot easiernet working engineers developed DNS, and DNS stands for a domain name system. And DNS resolves names to numbers , to be more specificit resolves domain names to IP addresses.
By the numbers, because that's how computers
And other similar devices talk and
Identify with each other over a network,
Which is by using numbers such as IP
Addresses.Humans on the other hand are
accustomed to using names instead of
numbers,
whether is talking directly to another
person or identifying a country,
place, or thing, humans identify with
names instead of numbers.So in order to bridge the communication gap between computers and humans and make the communication of a lot easiernet working engineers developed DNS, and DNS stands for a domain name system. And DNS resolves names to numbers , to be more specificit resolves domain names to IP addresses.
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| DNS technology network ItEthical Hacking |
How DNS works ?
So if you type in a web address in your web browser, DNS will resolve the name to a number because the only thing computers know are numbers. So for example if you wanted to go to a certain website you would open up your web browser and type in the domain name of that website, so, for example lets use yahoo.com.Now technically you really don't have to type in yahoo.com to retrieve the Yahoo web page, you can just type in the IP address instead if you already knew what the IP address was, but since we are not accustomed to memorizing and dealing with numbers, especially when there are millions of websites on the internet, we can just type in the domain name instead and let DNS convert it to an IP address for us.
So back to our example, when you typing yahoo.com your web browser the DNS server with search through its database to find a matching IP address for that domain name, and when it finds it it will resolve that domain name to the IP address of the Yahoo website, and once that is done then your computer Is abel to communicate with a Yahoo webserver and retrieve the webpage.
So DNS basically works like a phone book, when you want to find a number, you don't lookup the number first, you look up the name first then it will give you the number.So to break this down into further detail let's examine the steps that DNS takes.So when you type on yahoo.com in your web browser and if your web browser or operating system can't find the IP address in its own cache memory, it will send the query to the next level to whats called the resolver server to resolver server is basically your ISP or Internet service provider, so when the resolver receives the query, it will check its own cache memory to find an IP address for yahoo.com, and if it can'find it will send the query to the next level which is the root server. The root servers are the top or the root of a DNS hierarchy. There are 13 sets of these root servers, and they are strategically placed around the world, and they are operated by 12 different organizations and each set of these root servers has their unique IP address.
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| DNS Technology ItEthical Hacking |
DNS Technology ItEthical Hacking:
The root server receives the query for the IP address for yahoo.com , the root server is not going to knowwhat the IP address is, but the root server does know where to send the resolver to help it find the IP address .So the root server will direct the resolver to the TLD or top-level domain server for the dot-com domain. So the
resolver will now ask the TLD server for the IP address for yahoo.com . The top level domain server stores the
address information for a top-level domains, such as.com and.net dot org and so on. This particular TLD server manages the dot-com domain which yahoo.com is a part of. So when a TLD server receives the queryfor the IP address for yahoo.com, the TLD server is not going to know what the IP addresses for yahoo.com .
So the TLD will direct the resolver to the next and final level, which are the authoritati names . So once again the resolver will now ask the authoritative name server for the IP address for yahoo.com . The authoritative name server or servers are responsible for knowing everything about the domain which includes the IPaddress. They are the final authority. So when the authoritative name server receives the query from the resolver, the name server will respond with the IP address for yahoo.com.
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My Opinion About DNS:
I think DNS is the most important thing to serve and using internet . Without it any browser can't work . It helps to connect with different servers .Finallyresolver will tell your computer the IPaddress for yahoo.com and then your computer can now retrieve the Yahoo webpage . It's important to note that once the resolver receives the IP address, it will store it in its cache memory in case it receives another query for yahoo.com so it doesn't have to go through all those steps again.If you find this post is helpful please support us .
