Which of the following is the MOST secure protocol to transfer files?

A.
FTP

B.
FTPS

C.
SSH

D.
TELNET

Explanation:
FTPS refers to FTP Secure, or FTP SSL. It is a secure variation of File Transfer Protocol (FTP).
Incorrect Answers:
A: FTP traffic is vulnerable to packet sniffing and other forms of eavesdropping. It is, therefore, not
secure.
C: SSH allows a user to run commands on a machine’s command prompt without being near the machine
physically.
D: TELNET, by default, does not encrypt any data sent over the connection, and so it is often practical to
eavesdrop on the communications and use the password later for malicious purposes. It is, therefore, not
secure.

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 42, 46, 49, 51