3com WX3000 User Manual

 

1-1 

 

z 

The term switch used throughout this document refers to a switching device in a generic sense or 

the switching engine of a WX3000 series. 

z 

The sample output information in this manual was created on the WX3024. The output information 

on your device may vary 

 

Secure Shell (SSH) is a protocol that provides secure remote login and other security services in 

insecure network environments. In an SSH connection, data are encrypted before being sent out and 

decrypted after they reach the destination. This prevents attacks such as plain text password 

interception. Besides, SSH also provides powerful user authentication functions that prevent attacks 

such as DNS and IP spoofing. 

SSH adopts the client-server model. The device can be configured as an SSH client or an SSH server. 

In the former case, the device establishes a remote SSH connection to an SSH server. In the latter case, 

the device provides connections to multiple clients. 

Furthermore, SSH can also provide data compression to increase transmission speed, take the place of 

Telnet or provide a secure “channel” for FTP. 

 

z 

Currently, the device that serves as an SSH server supports two SSH versions: SSH2 and SSH1, 

and the device that serves as an SSH client supports only SSH2.  

z 

Unless otherwise noted, SSH refers to SSH2 throughout this document. 

 

Algorithm is a set of transformation rules for encryption and decryption. Information without being 

encrypted is known as plain text, while information that is encrypted is known as cipher text. Encryption 

and decryption are performed using a string of characters called a key, which controls the 

transformation between plain text and cipher text, for example, changing the plain text into cipher text or 

cipher text into plain text.