Which protocol operates on port 80 for web traffic?

Which protocol operates on port 80 for web traffic?

• A. Telnet Protocol
• B. Hypertext Transfer Protocol (HTTP)
• C. Trivial File Transfer Protocol (TFTP)
• D. Kerberos—authentication system

Answer: (B)

Port assignments for web traffic dictate that the Hypertext Transfer Protocol (HTTP) is the standard protocol for serving web pages on the plain HTTP port 80. When you type a URL that starts with http://, your browser connects to the server on port 80 by default, unless a different port is specified. This is why HTTP is the protocol associated with port 80. In contrast, Telnet uses a different port (23) for remote shell access, TFTP uses UDP port 69 for simple file transfers, and Kerberos operates on port 88 (with 464 for admin tasks), so they are not used for typical web traffic on port 80. Note that secure web traffic uses HTTPS, which runs on port 443, not 80.

Port assignments for web traffic dictate that the Hypertext Transfer Protocol (HTTP) is the standard protocol for serving web pages on the plain HTTP port 80. When you type a URL that starts with http://, your browser connects to the server on port 80 by default, unless a different port is specified. This is why HTTP is the protocol associated with port 80.

In contrast, Telnet uses a different port (23) for remote shell access, TFTP uses UDP port 69 for simple file transfers, and Kerberos operates on port 88 (with 464 for admin tasks), so they are not used for typical web traffic on port 80. Note that secure web traffic uses HTTPS, which runs on port 443, not 80.