CompTIA Security Plus Mock Test Q135

By default, which of the following uses TCP port 22? (Select THREE).

A. FTPS
B. STELNET
C. TLS
D. SCP
E. SSL
F. HTTPS
G. SSH
H. SFTP

Correct Answer: D,G,H
Section: Network Security

Explanation:
G: Secure Shell (SSH) is a cryptographic network protocol for securing data communication. It establishes a secure channel over an insecure network in a client-server architecture, connecting an SSH client application with an SSH server. Common applications include remote command-line login, remote command execution, but any network service can be secured with SSH. SSH uses port 22.
D: SCP stands for Secure Copy. SCP is used to securely copy files over a network. SCP uses SSH to secure the connection and therefore uses port 22.
H: SFTP stands for stands for Secure File Transfer Protocol and is used for transferring files using FTP over a secure network connection. SFTP uses SSH to secure the connection and therefore uses port 22.

Incorrect Answers:
A: FTPS stands for File Transfer Protocol – Secure. FTPS is similar to SFTP in that it is used to securely transfer files. The difference between the two is the encryption protocol used.
FTPS uses the SSL or TLS cryptographic protocols and therefore uses port 443.
B: STelnet stands for secure telnet. STelnet uses SSL by default and therefore uses port 443.
C: TLS (Transport Layer Security) is a successor to SSL and uses port 443.
E: SSL (Secure Sockets Layer) uses port 443.
F: HTTPS (Hypertext transfer protocol – secure) is used by web sites to encrypt and security transmit data. HTTPS uses the SSL or TLS cryptographic protocols and therefore uses
port 443.

References:
http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers