Q

What OSI Layer 4 protocol does FTP use to guarantee data delivery?

What OSI Layer 4 protocol does FTP use to guarantee data delivery?

What OSI Layer 4 protocol does FTP use to guarantee data delivery?

The OSI model of networking provides users with an abstract way of understanding the relationships between networking protocols. The fourth layer of that model, the transport layer, is responsible for ensuring successful end-to-end communications. The two most common layer four protocols are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP). As with many Internet protocols, the File Transfer Protocol (FTP) uses the Transmission Control Protocol (TCP) to provide guaranteed delivery on top of the Internet Protocol (IP).

If you're planning to use FTP in your environment, I'd advise carefully considering the business case for that implementation to ensure that there is a true need for the protocol.

It's important to remember that FTP is an inherently insecure protocol, as it does not use any type of encryption, even for authentication. The usernames, passwords and data transmitted via FTP are open to eavesdropping as they cross the Internet. Unless you're planning a public access site that allows downloads without having to provide personal credentials, I'd strongly recommend that you consider the use of a secure alternative, such as Secure FTP (SFTP).

Again, I can't stress strongly enough that FTP alone is not secure. It should only be used in two cases: running a public access anonymous download site and running an internal file service that is protected against eavesdropping by other means, such as network segmentation.

More information:

This was first published in December 2008

Dig deeper on Network Protocols and Security

Pro+

Features

Enjoy the benefits of Pro+ membership, learn more and join.

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

-ADS BY GOOGLE

SearchCloudSecurity

SearchNetworking

SearchCIO

SearchConsumerization

SearchEnterpriseDesktop

SearchCloudComputing

ComputerWeekly

Close