SSH: Cisco Exam 200-125 | Cisco Certified Network Associate Exam

AC

SSH stands for Secure Shell, which is a protocol used for securely accessing remote servers and devices over a network. It provides a secure channel for communication between two untrusted hosts by encrypting all data transmitted over the network.

Regarding the given options:

A. use port 22: This statement is correct. SSH uses TCP port 22 as the default port for communication. However, it can be configured to use other ports as well.

B. unsecured: This statement is incorrect. SSH is a secured protocol that provides confidentiality, integrity, and authenticity of data by using encryption, hash functions, and digital signatures.

C. encrypted: This statement is correct. SSH uses various encryption algorithms such as AES, 3DES, Blowfish, etc., to encrypt all data transmitted over the network.

D. most common remote-access method: This statement is partially correct. While SSH is a widely used remote-access method, it is not the most common one. VPNs, RDP, and Telnet are other commonly used remote-access methods.

E. operate at transport: This statement is incorrect. SSH operates at the application layer of the OSI model, providing a secure shell or terminal access to remote hosts over a network.

In summary, SSH is a secured protocol that uses encryption to provide secure remote access to servers and devices. It uses TCP port 22 by default and operates at the application layer of the OSI model.