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  Configuring passwords on the cisco IOS: Protecting privilege mode: Option I DeviceName(config)#enable password XXXX Option II DeviceName(config)#enable secret XXXX NOTE: Using “Option I” is not recommended as it stores password in clear text that can easily be tracked. Whereas “Option II” saves password in encrypted format. If both passwords are set, IOS uses secret password. Space Bar is counted as a character in password. Protecting user mode: DeviceName(config)# line console 0 DeviceName(config-line)#password XXXX DeviceName(config-line)#login Setting up Telnet: NOTE: This applies after successful IP configuration of the VLAN1 with valid IP address. DeviceName(config)# line vty X Y X = First line number and Y= Last line number. i.e. the number of allowed concurrent telnet sessions. DeviceName(config-line)#password XXXX NOTE: telnet will not work without any password. Keeping an eye on telnet session: DeviceName#termial monitor