Which of these is usually referred to as the port number (default) of several web servers like apache? A: 40B: 20C: 87D: 80

The port number that is usually referred to as the default for several web servers, including Apache, is 80. This port number is recognized as the standard for HTTP (Hypertext Transfer Protocol), which is the foundation of data communication on the web.

Explanation

When a web server is set up for the first time, it typically listens for incoming HTTP requests on port 80. This means that when you enter a URL in your browser without specifying a port, the browser automatically assumes port 80 is being used unless directed otherwise.

Here’s a brief about the other options:

• Port 40 is not associated with a common web service.
• Port 20 is typically used for FTP (File Transfer Protocol) data transfer.
• Port 87 is less commonly referenced and does not relate to standard web services.

Final Answer

Thus, the correct answer is D: 80.