Which Cisco Internetwork Operating System (IOS) command is used to encrypt passwords on Cisco routers?

A.
password secure

B.
service encryption-password

C.
service password-encryption

D.
enable password

Explanation:
The service password-encryption command is used to encrypt passwords on Cisco routers. It is used to encrypt
all passwords configured on the router, both current and future. This means all passwords in the plain textconfiguration file will be encrypted. This command is issued in global configuration mode. The syntax of the
command is as follows:
Router(config)# service password-encryption
This command does not have any parameters.
Once executed any password in the configuration file will appear similar to what is shown below when the
running or startup configuration files are viewed:
R1#show run
<output omitted>
line console 0
password 7 09-4f60C0B1C1B
login
<output omitted>
The password secure and service encryption-password commands are incorrect because they are not valid
Cisco IOS commands.
The enable password command is used to set the privileged EXEC mode password, and does not encrypt the
password by default.
Objective:
Infrastructure Security
Sub-Objective:
Configure, verify, and troubleshoot basic device hardening

Cisco > Cisco IOS Security Configuration Guide, Release 12.4 > Part 7: Secure Infrastructure > Configuring
Security with Passwords, Privilege Levels and, Login Usernames for CLI Sessions on Networking Devices