Why
Use Secure Shell (SSH)?
Secure Shell (SSH) improves network
security by providing a means of establishing secure connections to networking
devices for management, thereby preventing hackers from gaining access.
Using Digital Certificates, in a Public/Private Key
Cryptography, SSH is able to authenticate clients or servers ensuring that the
device or server you are about to connect to is exactly who they claim to be.
What About Telnet?
Like SSH, Telnet can also be used to connect to your router but, the main disadvantage of using Telnet is that it does not encrypt its connections. This means that if a hacker is able to capture packets from a Telnet session, he or she would be able to view information contained within those packets, such as a client's username and password, therefore gaining access to your router.
Following is a configuration example of SSH configuration:
Topology:
