Cisco routers and switches can be managed via telnet.
To enter the user mode cli via telnet a VTY (telnet) password needs to be set.
This password can be set by issuing the following commands:
Router>
! go to enable mode
Router>enable
Router#
!
! go to global configuration mode
Router#config t
Router(config)#
! go to the configuration of the vty lines
Router(config)#line vty 0 4
! configure the vty (telnet) password
Router(config-line)#password cisco
! exit configuration mode
Router(config-line)#ctrl-Z
! write configuration to NVRAM
Router#wr
The privileged mode (enable mode) can only be entered via telnet if the a enable password is set.
Router#config t
Router(config)#enable password cisco
Router(config)# ctrl-Z
Router#wr
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