(ISC)2 Certified in Cybersecurity Practice Exam

When browsing the web, which port is most commonly used?

1. 12

2. 80

3. 247

4. 999

The correct answer is: 80

The correct choice is associated with the standard port used for web traffic. Port 80 is the default port for Hypertext Transfer Protocol (HTTP), which is the foundation of data communication on the World Wide Web. When users enter a website address in their browsers without specifying a port, their requests automatically go through port 80 to retrieve web pages. This port facilitates the transfer of documents and files between clients (browsers) and servers (websites), allowing users to access web content seamlessly. It is important to note that while secure web traffic typically uses port 443 (for HTTPS), the question specifically asks for the most commonly used port for standard web browsing, which unequivocally is port 80. The other options listed represent ports that are not standard for general web browsing, thus affirming that port 80 is indeed the most relevant answer in this context.