Which of the following would be used as a secure substitute for Telnet?
Correct Answer: A
Secure Shell (SSH) is a tunneling protocol originally designed for Unix systems. It uses encryption to establish a secure connection between two systems. SSH also provides
alternative, security-equivalent programs for such Unix standards as Telnet, FTP, and many other communications-oriented applications. SSH is available for use on Windows
systems as well. This makes it the preferred method of security for Telnet and other cleartext oriented programs in the Unix environment.
B: SFTP is for File transfers, not for telnet.
The SSH File Transfer Protocol (also Secure File Transfer Protocol, or SFTP) is a network protocol that provides file access, file transfer, and file management functionalities over any
reliable data stream.
C: SSL is used to provide a secure channel, not to establish a telnet connection.
The Secure Socket Layer (SSL) and Transport Layer Security (TLS) is the most widely deployed security protocol used today. It is essentially a protocol that provides a secure channel
between two machines operating over the Internet or an internal network.
D: HTTPS is not used for telnet connections.
HTTPS is a communications protocol for secure communication over a computer network, with especially wide deployment on the Internet.
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, pp. 76, 91, 268-269, 271, 274