How to set a password for user mode.

enable
conf t
line console 0
password eihtech
login

how to set a password for privileged mode.

enable
conf t
enable password eih1234

how to enable secret password

enable
conf t
enable secret password tech12

how to set telnet password

line vty 0 4
password ccnp
login

PASSWORD RECOVERY

* Connect console cable to com1 port of pc and another end of rollover cable to console port of router

* Before switching on router open hyper terminal application , switch on your router press control+break(pause) for going in to ROMMON mode

* Change configuration register number to 2142 by using command

[ rommon1>confreg 2142 ]

Now reset router by
rommon1>reset command or boot router by,
rommon1>boot

Now router will prompt you to enter in to initial configuration mode. Type  “no” there.

* Now load your startup-configuration in to Running

Router# copy startup-config running-config

Now change VTY and enable password, and check whether your interfaces are “up” at layer1 by

#show interface brief

If interfaces are not “up”, then make them “up” at physical layer by “no shutdown” command

Now copy Running-configuration in to startup configuration

#copy running-config startup-config

Change configuration register to “2102”
 
#configure terminal
#config-register 2102

Now you should be able to ACCESS the router via VTY

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