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Switch#copy source destination
Switch#erase nvram
or
Switch#erase startup-config
Switch#delete flash:config.bak1
Switch(config)# Enables service password-encryption
Switch(config-line)#transport input ssh
Switch(config-line)#transport input telnet
Switch(config-line)#transport input all

Switch(config)# ip domain-name ccnaguru.com
Switch(config)#ip ssh version 2
Switch(config)# crypto key generate rsa
Switch(config)#ip ssh timeout 60
Switch(config)# ip ssh authentication-retries 5