This is the default if SSH cannot find a key pair for authentication purposes. On the client machine, issue this command:
Obviously, you need to specify your account name as user and the proper domain name as domainname. This implies that you must have an account on the machine first.
If the connection is successfuly, you will be asked to enter your password.
Note that unlike telnet which uses plain text transmission, SSH encrypts all server-client traffic. This encryption is based on a key pair that is generated when the SSH server is installed. Encrypted traffic means it is very difficult (read practically impossible) for a sniffer to decipher the traffic. As a result, the user name and password during the authentication stage are both protected.