Configuring password

Connect to our router with a special CISCO cabel and a windows program HyperTerminal(Start-> Programs-> Accessories->Communications->HyperTerminal). On the desktop we can see a command line.
Then following the commands below we will configure a password for terminal and virtual lines (for console port and for telnet):

Router>enable             
Router#configure terminal     
Router(config)#service password-encryption 
Router(config)#line con 0               
Router(config-line)#password alexs   
Router(config-line)#login     
Router(config-line)#exit   
Router(config)#line vty 0 4              
Router(config-line)#password planet 
Router(config-line)#login    
Router(config-line)#exit
Router(config)#enable secret alexsplanet 

Notifications:
-password "alexs" is for console port
-password "planet" is for telnet connection
-password "alexsplanet" is for priveliage mode