Which port number is used for HTTP traffic?

The correct answer is based on the standardized port assigned for HTTP traffic in the realm of networking. Port 80 is the default port used by web servers to handle HTTP requests. When a user types a website URL into their browser and requests a page without specifying a port, the browser automatically directs traffic to port 80. This standardized approach has been established to ensure compatibility and uniformity across various web servers and clients, facilitating successful communication and data transfer on the World Wide Web.

Other port numbers listed serve different purposes; for instance, port 53 is utilized for DNS queries, port 110 is associated with the retrieval of emails using the POP3 protocol, and port 443 is designated for HTTPS traffic, which is HTTP over SSL/TLS. Each of these protocols operates independently from HTTP and addresses different types of network communication needs. Understanding these distinctions is crucial for network configuration and management.