MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -Unlike modern protocols that use two-way synchronization, POP3 only supports one-way email synchronization, only allowing users to download emails from a server to a client.

Detailed explanation-2: -POP3 stands for Post Office 3 protocol and is used for receiving email messages. POP protocol simply connects to the mail server and retrieves the mail content. This simple, and standard, way allows users to quickly access mailboxes and download messages to their devices.

Detailed explanation-3: -POP works by contacting your email service and downloading all of your new messages from it. Once they are downloaded onto your PC or Mac, they are deleted from the email service. This means that after the email is downloaded, it can only be accessed using the same computer.

Detailed explanation-4: -the Post Office Protocol POP3 (TCP port 110) commonly used by mail clients to retrieve Internet mail. Rather, the Cisco PostOffice Protocol is a UDP service that functions, by default, over port 45000 to provide messaging between the management console and IDS sensors.

Detailed explanation-5: -As a rule, the system uses SMTP (Simple Mail Transfer Protocol) or ESMTP (extended SMTP) for sending e-mail, and either POP3 (Post Office Protocol 3) or IMAP (Internet Message Access Protocol) for receiving e-mail.