What is the role of the HTTP protocol at the Application Layer?

The HTTP (HyperText Transfer Protocol) is one of the most important protocols at the Application Layer in the OSI model. Its core function is to deliver web content from server to client. It acts as the foundation of data communication on the World Wide Web.

When a user types a web address into a browser, the browser sends an HTTP request to the server. The server responds with an HTTP response that includes HTML pages, images, stylesheets, and other resources. This entire exchange is managed by HTTP.

• Client-Server Model: HTTP works based on requests from clients (like browsers) and responses from servers (web hosts).


• Stateless Protocol: Each HTTP request is independent, without remembering past interactions.


• Port: It uses port 80 by default, or port 443 when combined with SSL/TLS (HTTPS).


• Web Methods: It supports GET (to retrieve data), POST (to send data), and other methods used in web services and APIs.

In summary: HTTP is essential for accessing and exchanging information over the internet. It operates at the Application Layer, facilitating web content delivery, and making the internet usable for people around the world.

Correct Answer: C. It delivers web content from server to client.