Copyright

Application Layer Protocols: Types & Uses Video

An error occurred trying to load this video.

Try refreshing the page, or contact customer support.

Coming up next: Designing a TCP/IP-Based Network

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
 Replay
Your next lesson will play in 10 seconds
  • 0:04 Application Layer Definition
  • 1:03 Application Layer…
  • 3:20 Lesson Summary
Save Save Save

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Log in or Sign up

Timeline
Autoplay
Autoplay
Speed Speed

Recommended Lessons and Courses for You

Lesson Transcript
Instructor: Meghalee Goswami
This lesson explains the basics of application layer protocols. It also elucidates some of the most commonly used protocols in the OSI Model application layer.

Application Layer Definition

The application layer is the top-most layer in the OSI Model and is used for establishing process-to-process communication and user services in a network. It's the interface between user applications and the underlying network. Whether you open a web page in a browser or read an email, you are interacting with the application layer of the network. In short, it's a layer which involves human interaction with applications and software to connect users together across the globe.

A protocol is a set of rules used to communicate between systems in a network. Although the application layer is the medium through which you are able to communicate with other users, a set of protocols are required to assist with this communication. For example, if you have to open a web page, you need the HTTP or HTTPS protocols. Similarly, you would require POP3 or IMAP and SMTP for sending and receiving emails. Let us take a look at the various types of protocols with their uses.

Application Layer Protocol Types

Application layer protocols can be broadly categorized as is shown in the figure appearing here:

Figure 1: Application Layer Protocols
AL

1. Browsing Protocols

Hypertext Transfer Protocol (HTTP) and Hypertext Transfer Protocol Secure (HTTPS) are used when you attempt to open any web page online. You've probably seen that whenever you open a web page in a browser, http or https is always mentioned in the URL or web site address.

2. File Transfer Protocols

File Transfer Protocol (FTP) and Trivial File Transfer Protocol (TFTP) are used for transferring small and large files across a network. The only difference between the two protocols is that FTP allows authentication and TFTP does not.

3. Email Protocols

Post Office Protocol v3 (POP3) and Internet Message Access Protocol (IMAP) are used for retrieving an email from a server. The difference between them lies with how the original message is treated. POP3 downloads a copy of the email from the server and deletes the original. IMAP downloads a copy from the server but does not remove the email from the server until the user himself deletes it. Simple Mail Transfer Protocol (SMTP) is the protocol used to send emails from one account to another.

4. Remote Administration Protocols

Telnet and Secure Shell (SSH) protocols come handy when you wish to log into a system remotely and access any files on that remote system.

To unlock this lesson you must be a Study.com Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use Study.com

Become a Study.com member and start learning now.
Become a Member  Back
What teachers are saying about Study.com
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account
Support