Which protocol is commonly used for sending emails?
SMTP
Understanding Protocols for Sending Emails
In the world of computer networks, protocols are sets of rules that devices follow to communicate with each other. When we perform tasks like browsing the web, transferring files, or sending emails, different protocols are at work to ensure the data gets where it needs to go correctly.
The question asks specifically about the protocol commonly used for sending emails. Let's look at the provided options:
- HTTPS: This stands for Hypertext Transfer Protocol Secure. It is primarily used for secure communication over a computer network, most commonly for internet browsing (websites). It's not used for sending emails.
- FTP: This stands for File Transfer Protocol. As the name suggests, it is used for transferring files between computers on a network. It is not the protocol for sending emails.
- SMTP: This stands for Simple Mail Transfer Protocol. This is the standard network protocol used for sending emails from a client (like your email program) to a server, or between email servers. It is specifically designed for the transport of mail across the internet.
- TCP: This stands for Transmission Control Protocol. TCP is a foundational transport layer protocol that provides reliable, ordered, and error-checked delivery of a stream of octets between applications running on hosts communicating via an IP network. Many application layer protocols, including SMTP, FTP, and HTTPS, run on top of TCP. While essential for the delivery, TCP itself is not the application-level protocol for sending emails.
Based on the definitions and uses of these protocols, SMTP is the one designed and used for sending emails. It's the standard way email clients push outgoing mail to a mail server, and how mail servers relay mail to other mail servers.
Therefore, Simple Mail Transfer Protocol (SMTP) is the protocol commonly used for sending emails.
Important Questions from Miscellaneous
A stone is thrown horizontally from the top of a 20 m high building with a speed of 12 m/s. It hits the ground at a distance R from the building. Taking g = 10 m/s2 and neglecting air resistance will give :
A sphere of volume V is made of a material with lower density than water. While on Earth, it floats on water with its volume f1V (f1 < 1) submerged. On the other hand, on a spaceship accelerating with acceleration a < g (g is the acceleration due to gravity on Earth) in outer space, its submerged volume in water is f2V. Then:
A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes M2 and speed becomes v2. Taking the rain to be falling vertically and the water stationery inside the wagon, the relation between the two speeds v1 and v2 is :
Consider the following statements:
1. Distance between the longitudes becomes zero on North Pole and South Pole.
2. Distance between the longitudes is maximum on the Equator.
3. Number of longitudes is more than number of latitudes.
Which of the statements given above is/are correct?
One block of 2⋅0 kg mass is placed on top of another block of 3⋅0 kg mass. The coefficient of static friction between the two blocks is 0⋅2. The bottom block is pulled with a horizontal force F such that both the blocks move together without slipping. Taking acceleration due to gravity as 10 m/s2, the maximum value of the frictional force is :
