Explain the process that occurs when you input a URL into your browser and hit Enter.

This technical question is commonly asked to evaluate your comprehension of internet protocols and procedures. The interviewer seeks to understand your knowledge of the processes that occur behind the scenes when a URL is entered and the enter key is pressed. This involves your familiarity with networking protocols such as DNS, HTTP/HTTPS, IP, TCP, as well as the function of a web browser in this context. Your response should be succinct and technical, demonstrating your grasp of internet infrastructure. Key aspects to include in your answer are: How the browser parses the URL and manages the corresponding HTTP or HTTPS protocols. The function of the Domain Name System (DNS). The process of establishing a TCP connection. The actual request and response process that follows. The browser's role in rendering the received data to display the webpage to the user.

When you enter a URL into your browser and hit Enter, the following sequence of events occurs: The browser analyzes the URL to identify the protocol (HTTP or HTTPS), the domain name, and the file name. Next, the browser communicates with the DNS server to obtain the IP address associated with the domain name from the URL. Following this, the browser initiates a TCP connection with the server located at that IP address. Once the connection is established, the browser sends an HTTP request to the server for the file specified in the URL. The server then responds with an HTTP message. If the HTTP status falls within the range of 200-299, the browser begins to render the HTML. If it returns a 404 status, it indicates that the web page could not be found. Finally, the browser renders the HTML to display the web page to the user.

When you enter a URL into a browser and hit Enter, a series of network processes occur in the background: Initially, the browser decomposes the URL into its components: the protocol, the domain name, and the specific address of the page. Next, it looks up the domain's IP address by querying the DNS. After obtaining the IP address, the browser establishes a TCP connection with the server hosting the site. With the connection in place, the browser requests the desired web page from the host using either HTTP or HTTPS. The server then sends back the content of the webpage, typically in HTML format. Finally, the browser displays this HTML on your screen, allowing you to view the webpage you requested.