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Cisco IOS Commands - CCNA Level

A good working knowledge of Cisco IOS commands is vital for your success in your Cisco exam. You will be tested on them during the switch and router simulations and also in the multiple choice questions.

Here are what we think are the most important ones you need to know along with how to apply them to live Cisco equipment. If you think we have missed any out please drop us a line to help at howtonetwork.net

Unprivileged Commands

enable	lock	ping
telnet	traceroute	resume
disconnect	ssh	exit

Privileged Commands

configure terminal	debug	setup
copy running-config startup-config	erase startup-config	write
clock set	clear	reload
write terminal	undebug all	copy tftp startup-config
copy running-config tftp	copy tftp running-config	copy startup-config running-config
terminal monitor		copy startup-config tftp

Configure Commands

ip domain-lookup no hostname
config-register clock timezone alias exec

logging console do default interface

interface router username

ip classless ip subnet-zero ip default-gateway

ip dhcp pool enable secret ip domain-name

ip host ip http server ip name-server

ip route access-list (standard) access-list (extended)
ip access-list service password-encryption interface loopback

end logging buffered banner motd

router rip router eigrp <As> router ospf <process id>

ip nat pool ip nat inside source list ip nat inside source static

ip dhcp excluded-address enable password

Interface Commands

ip address	clock rate	encapsulation
bandwidth	description	duplex
no shutdown / shutdown	encapsulation dot1q	keepalive
ip access-group	ip bandwidth-percent (EIGRP)	ip directed-broadcast
ip helper-address (DHCP)	ip mtu	ip ospf #
ip ospf cost	ip ospf priority	ip ospf network broadcast
ip ospf network non-broadcast	ip ospf network point-to-point	ip ospf network point-to-multipoint
ip ospf hello-interval	ip ospf dead-interval	cdp enable
ip rip send	ip rip receive	speed
mac-address	ip split-horizon (RIP)	ip split-horizon eigrp <As>
encapsulation ppp	ppp authentication chap	ppp chap hostname
ppp chap password	ppp pap sent-username	encapsulation frame-relay
frame-relay interface-dlci	frame-relay map ip	frame-relay inverse-arp
ip nat inside	ip nat outside	ip nat enable
ip address dhcp	ppp authentication pap	delay

Line console Commands

logging synchronous	login	history size
exec-timeout	length	lockable
password	privilege

Line VTY Commands

logging synchronous login history size

exec-timeout length lockable

password privilege access-class

Show Commands

show access-lists	show Running-config	show startup-config
show running-config Interface	show Clock	show controllers
show debug	show frame-relay map	show frame-relay pvc
show frame-relay lmi	show hosts	show interfaces
show ip interfaces	show ip interfaces brief	show sessions
show tech-support	show ip access-lists	show ip dhcp binding
show ip dhcp conflicts	show ip dhcp pool	show dhcp server
show ip eigrp interface	show ip eigrp neighbors	show ip eigrp topology
show ip ospf interface	show ip ospf interface brief	show ip ospf neighbor
show ip ospf database	show ip route	show ip route rip
show ip route eigrp	show ip route ospf	show ip route connected
show ip nat translations	show ip nat statistics	show ip protocols
show cdp neighbors	show cdp neighbors detail	show dhcp lease
		Filtering Output *

Router RIP Commands

version 2	no auto-summary	network
passive-interface	validate-update-source	passive-interface default
maximum-paths	distribute-list	offset-list
distance	timers	neighbor

Router EIGRP Commands

no auto-summary	network	distance
distribute-list	eigrp router-id	passive-interface
passive-interface default	variance (EIGRP)	offset-list
distance eigrp	maximum-paths	neighbor

Router OSPF Commands

		network
passive-interface	router-id	passive-interface default
maximum-paths	distribute-list	auto-cost reference-bandwidth
distance	distance ospf	neighbor

Debug Commands

debug ip packet	debug ip packet detail	debug ip routing
debug ip eigrp	debug ip ospf adj	debug ip ospf events
debug ip ospf packet	debug ip rip

Clear Commands

clear ip route *

clear ip ospf process

clear ip eigrp neighbors

Switch Commands

Privilege Commands

vlan database

configure

Vlan Database Commands

vlan	exit	show
vtp domain	vtp pruning	vtp server
vtp client	vtp transparent	vtp password
apply

Configure Commands

vlan	interface vlan	interface range
vtp mode server	vtp mode client	vtp mode transparent
vtp domain	vtp password	spanning-tree backbonefast
vtp pruning	spanning-tree portfast	ip default-gateway
spanning-tree vlan root primary	spanning-tree vlan root secondary	spanning-tree vlan priority
spanning-tree uplinkfast

Interface Commands

switchport mode access	switchport mode trunk	switchport nonegotiate
spanning vlan cost	switchport trunk encapsulation dot1q	switchport trunk encapsulation isl
switchport trunk native vlan	spanning-tree port-priority	switchport trunk allowed vlan
switchport access vlan	switchport port-security	switchport port-security mac-address
spanning-tree vlan port-priority	switchport port-security maximum	switchport port-security violation
spanning-tree cost	spanning-tree guard root
spanning-tree portfast

Show Commands

show vlan	show vlan brief	show interface trunk
show spanning-tree	show spanning-tree vlan	show vtp status
show port-sec	show mac-address-table	show interface

Special Keys Commands

Tab	Return (at the --More-- prompt)	space Bar (at the --More-- prompt)
Ctrl-F	Esc-B	Esc-F
Ctrl-A	Ctrl-E	Ctrl-D
Esc-D	Ctrl-W	Ctrl-K
Ctrl-U or Ctrl-X	Up Arrow or Ctrl-P	Down Arrow or Ctrl-N
Ctrl-Y	Ctrl-Z	Ctrl-shift-6, x