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1. Which network protocol is used to send Email?
- A. SMTP
- B. SMTP
- C. SMTP
- D. SMTP
Answer: Option A
Explanation:
The Simple Mail Transfer Protocol (SMTP) is the network protocol used to send emails across the internet. It functions as the digital postal service, enabling email clients and servers to transfer messages from a sender's device to their intended recipient's server. While SMTP handles the delivery of email, other protocols like IMAP or POP3 are used by the recipient to retrieve and access their emails from the mail server.
How SMTP Works
How SMTP Works
- Email Composition: When you send an email, your email client uses SMTP to send the message to an SMTP server.
- Message Transfer: The SMTP server then acts as a relay, transferring the message to the recipient's mail server, often via other SMTP servers along the way.
- Delivery: The recipient's mail server receives the message and places it in the recipient's inbox.
- Standardization: SMTP provides a standardized set of rules for email systems and servers to communicate and exchange messages.
- Transmission: It's primarily a transport protocol, meaning it's responsible for the "pushing" or moving of email messages from point A to point B.
- Port Usage: SMTP commonly uses TCP port 25, but for secure submission from client to server, ports 587 and 465 (with encryption) are also frequently used.
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