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There are many types of protocols that are intended for various purposes. TCP/IP is Transfer Control Protocol/Internet Protocol which governs how data is transmitted over the internet. FTP is File Transfer Protocol which governs how files are transferred from a local machine to a remote machine, and vice-versa. Similar to FTP is SSH. SSH is Secure Shell, a program that is used to “log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another. It provides strong authentication and secure communications over insecure channels. It is a replacement for rlogin, rsh, rcp, and rdist.” - http://www.webopedia.com/TERM/S/SSH.html
SSH not only provides safe movement of files but also protects the network it is on from DNS spoofing, IP spoofing, and IP source routing. This means that if an attacker tries to access a network that is protected by SSH, he would only be able to force SSH to disconnect. Playback of the traffic on the network would be impossible because the connection would be encrypted. All valuable information that is transmitted over the network, like passwords, is encrypted which prevents password harvesting. If you are serious about protecting your data between networks, SSH is the program to use.
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