Command prompts:

‘>’ - basic mode
‘#’ - ‘exec’ mode
‘(config)#’ - configuration mode
‘(config-if)#’ - interface configuration mode

- enable ‘exec’ mode (Turn on privileged commands):

> enable

- enter global configuration mode:

# configure terminal

- enter interface configuration mode:

(config)# interface eth 0/0

- exit mode:

# exit

or

# end

- enumerate content stored on flash:

# show flash

- specify OS image to boot from:

(config)# boot system flash:/filename

- specify ASDM image to boot from:

(config)# asdm image flash:/filename

- show current boot variables:

(config)# show bootvar

- system details/info:

# show version

- save running configuration to flash:

# copy running-config startup-config

- restore to default configuration (factory defaults):

# write erase

- show running configuration:

# show run

- start interactive configuration wizard:

(config)# setup

- enable traffic between two or more interfaces which are configured with same security levels:

(config)# same-security-traffic permit inter-interface

- enable traffic between two or more hosts connected to the same interface

(config)# same-security-traffic permit intra-interface

- enable jumbo frames on specific interface:

(config-if)# jumbo-frame reservation

- configure VLAN:

(config)# interface eth 0/1
(config-if)# no shutdown
(config-if)# no nameif
(config-if)# interface eth0/1.10
(config-subif)# vlan 10
(config-subif)# nameif eth0/1.10
(config-subif)# security-level 50
(config-subif)# ip addr 192.168.10.1 255.255.255.0

- file system management:

# dir - list files
# more - list the content of a file
# copy - copy files
# delete - delete files