Port 110 is associated with which protocol?

Port 110 is associated with the Post Office Protocol version 3 (POP3). POP3 is a protocol used by email clients to retrieve email from a remote server over a TCP/IP connection. When an email client, such as Microsoft Outlook or Mozilla Thunderbird, connects to a mail server to download messages, it typically uses port 110 to do so.

The significance of this port lies in how POP3 operates. It allows users to download their emails and, in many cases, delete them from the server, which means messages are stored locally on the user's device. This has implications for how messages are accessed, especially with regard to the use of multiple devices. Often, users choose between POP3 and other protocols, such as IMAP, which operates on a different port and has a different mechanism for handling message storage and retrieval.

This specific association with port 110 makes it crucial to understand in the context of email protocols and networking concepts.