To password protect privileged exec mode on your switch, issue the following command in global configuration mode
enable secret my_password
if you are running an old ios and enable secret is not recognized then issue
enable password my_password
and encrypt the password
service password-encryption
next secure the virtual consoles
line vty 0 15 password_my_password login
and finally the console
line con 0
password my_password
do not forget to issue from privileged exec mode
copy run start
to save your configuration
reload the switch and test
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