There are three different types of Cisco IOS passwords. 1) Cisco IOS type 0 passwords There is a command in Cisco IOS that can be issued to encrypt all passwords in the configuration file. If this command is not entered into the configuration file then all passwords (except for the enable secret password) will appear as plaintext as shown below: username admin privilege 15 password 0 cisco From the above lines in the Cisco IOS configuration file we can see that in this example the user admin has a password of cisco. The above passwords are noted as type 0 (zero) as shown by the zero that precedes the actual password. Type 0 passwords use no encryption. 2) Cisco IOS type 7 passwords The command that is issued to encrypt user passwords is "service password-encryption" and this command should be entered from the Cisco router configuration mode prompt. If the "service password-encryption" command is issued then all type 0 (zero) passwords are become encrypted use
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