Preconfig

enable
configure terminal
line console 0
no exec-timeout
logging synchronous
no ip domain lookup
hostname

save config

SW1# copy running-config startup-config
SW1# write

erase config

SW1# erase startup-config
SW1# erase nvram:
SW1# write erase

filter strings

SW1# show running-config | include 0/0
SW1# show running-config | section 0/0

telnet mode

SW1# conf t
SW1(config)# line vty 0 4
SW1(config-line)# transport input telnet
SW1(config-line)# password welcome
SW1(config-line)# login