In a URL scheme like '[https://www.example.com:8080/index.html](https://www.google.com/search?q=https://www.example.com:8080/index.html)', what does the component '8080' specifically represent? MCQ with Answer and Explanation

Which network component acts as an intermediary gateway or buffer between a local computer client and the broader internet, often used to cache requests or hide client IPs?

Which protocol is used for retrieving email from a server and is known for leaving messages on the server?

Which specific email protocol is best suited for a user who needs to check their single centralized email inbox across a personal smartphone, an office desktop computer, and a home laptop while maintaining a uniform folder layout?