Configure telnet password on Cisco router & switches
R1#conf t
R1(config)#line vty 0 4
R1(config-line)#password cisco
R1(config-line)#login
R1(config-line)#end
R1#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]
R1#
//Remember to set your enable password for full access
R1(config)#enable secret yourPassWord
How to set console password:
R1#conf t
R1(config)#line con 0
R1(config-line)#password cisco
R1(config-line)#login
R1(config-line)#end
R1#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]
R1#
Same step for configuring Auxiliary (AUX) port.
Just replace line con 0 to line aux 0