???? DNS: The Internet's Phonebook
CHETHAN PATEL P N
Data Scientist | Python, Machine Learning, NLP | Detecting Telecom Frauds
?????Happy Day 4!?
?? Today, let's dive into the fascinating world of DNS! Imagine the internet is like a giant phonebook ?? with phone numbers being IP addresses. Just like finding a friend's phone number, DNS translates domain names into IP addresses that computers use to communicate ??.
?? What is DNS? DNS stands for Domain Name System. It's like the phonebook of the internet. DNS translates human-readable domain names (like www.dhirubhai.net) into IP addresses (like 108.174.10.10) that computers use to communicate with each other.
?? Different Levels of DNS: DNS is a hierarchical system with several levels:
1?? Root Level - The highest level of DNS that contains information about the top-level domains (.com, .org, .net, etc.).
2?? Top-Level Domain (TLD) Level - This level contains information about the domain extensions (.com, .edu, .gov, etc.)
3?? Second-Level Domain (SLD) Level - This is the level that most people are familiar with. It contains information about the actual domain names (like google.com or linkedin.com)
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4?? Subdomain Level - This level allows you to create subdomains for your main domain (like blog.google.com or jobs.linkedin.com)
?? How does DNS work?
When you enter a domain name in your web browser, your computer sends a request to a DNS resolver (like a phonebook lookup service). The resolver checks its cache to see if it already has the IP address for the domain name. If not, it works its way up the DNS hierarchy, starting with the root level, until it finds the IP address. Once it has the IP address, the resolver sends it back to your computer, which uses it to connect to the website.
?? Fun fact: Without DNS, you would have to remember the IP addresses of every website you want to visit! So next time you type in a website name, take a moment to appreciate the magic of DNS! ??