What is Internet?
Internet is Basically a Network of more than two interconnected devices to share the resources and data with each other.
What is WWW?
- WWW stands for World wide Web.
- World wide Web is a collection of web resources over the internet such as-
- web pages
- websites
- Media(audio,video,images)
IP and PORTS
What is IP?
-IP stands for Internet Protocol.
-IP identify the network destination over the network by a unique number called address and it helps to send or recieve the data to the correct destination over the network.
-*Analogy *- IP is lika address of a house.
What are PORTS?
-PORTS are the 16 bit number range from 0 to 65535.
-There are many application and web services in our Device so Only IP does not decide that in which application i have to deliver the data so PORTS help to computer to deliver it.
-Analogy- PORTS are like the room in a particular address.
What are ISP's?
-ISP stands for Internet Service Providers.
-ISP provide us the Internet Connection so that we can use them to access the Internet.
-ISP lease the Phyiscal infrastucture or using its own and provide the services to the customer.
-Example- Airtel,BSNL,VI,Jio,etc.
DNS
What is DNS?
-DNS stands for Domain Name System.
-DNS convert the Domain name like google.com to an IP Address that help to communicate the server.
Recursive DNS Resolver
What is Recursive DNS Resolver?
-Recursive DNS resolver take the responsibility to find the IP of the queried domain to contact with the server.
Why it called Recusrive?
-Our Browser simply ask for the IP of the queried domain and then the Recursive DNS takes the full responsibility to find it and then provide to the Browser.
DNS Hierarchy
-DNS hierarchy tell the process of getting the IP from the Domain using DNS recursive resolver.
1.first you query to Browser by serching the domain - www.google.com.
2.then the browser ask to DNS recursive resolver for IP,DNS recursive resolver check whether the IP is cached for that Domain or not if Cached then simply returned the IP and if not then it point to the root server.
3.Root server simply direct to the TLD.
4.TLD stands for Top level domain it store the information of authoritative DNS server according to the domain ending like .com ,.in .co etc.
5.Authoritative server actually contain the IP of the Destinated Server and it provide the IP of that server.
DNS Records
What are DNS Records?
-DNS records are the information about the domain like domain name , its type which can be A,AAAA,CNAME,etc and the server IP.
Types of Records
1.A record - Connect domain name to an IPv4.
2.AAAA record - Connect domain name to an IPv6.
3.CNAME record - Make one hostname an alias of another for example www.yourname.com to hostinger.provider.yourname.com.
4.A record -
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