Some basics first

• URL?

  • URL = Uniform Resource Locator.

  • A URL is the address of a given unique resource on the Web. The resource can be an HTML page, image file, etc.

• DNS?

  • DNS = domain name server.

  • it maps an URL with its IP address. ( An IP address is a unique address that identifies a device on the internet )

What happens when we enter an URL in the browser?

• After clicking the search button, The browser checks if the URL is available in the DNS entry cache.

• It checks browser cache, os cache, router cache, and internet service provider cache. If not available, the Internet service provider s DNS makes a query to find the IP address of the URL.

• IP address is returned.

• Browser initiates the HTTP request to the IP address.

• The IP address returns the required response based on the request.

• The response is displayed in the browser.

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The End!

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