Which is a common port that contains Hyper Text Transfer Protocol servers and proxies?

Port 80 is widely recognized as the default port used for HyperText Transfer Protocol (HTTP). This port is critical for web traffic, as it is utilized by web servers to handle requests for web pages and resources over the Internet using the HTTP protocol. When a user accesses a website without specifying a port in the URL, the web browser assumes port 80 for the HTTP connection.

Port 443, while it is also commonly associated with web traffic, specifically serves HyperText Transfer Protocol Secure (HTTPS), which adds a layer of security through encryption but isn’t the standard HTTP port. Port 8080 can also serve HTTP traffic but is often used for alternative web services or proxy servers and is not the standard port for HTTP. Port 110 is associated with the Post Office Protocol (POP3), which is used for retrieving email and does not relate to HTTP. Therefore, the fact that port 80 is designated as the standard port for HTTP makes it the correct answer in this context.