CCNA Commands List Cheat Sheet (DRAFT) by kilox67612

SW1(co­nfig)#banner motd $"­enter welcome messag­e"$

sets message of the day banner when entering an IOS device.

R1(con­fig)#service passwo­rd-­enc­ryption

encrypts the current unencr­ypted passwords and featured inserted passwords with Type 7 encryp­tion.

R1(con­fig)#no ip domain­-lookup

disables DNS lookup from host and prevents miss-typed commands from being "­tra­nsl­ate­d". (CTRL+S­HIFT+6)

Router­(co­nfig)#line vty 0 15

select ports 0-15 for SSH/Telnet virtual line.

R1(con­fig)#login

activates a configured password that has been set for a remote connection such as Telnet or SSH.

R1(con­fig)#line console 0

STEP 2# sets up a username and password.

R1(con­fig)#end

STEP 4# sets up a username and password.

SW1(co­nfi­g-if)#default interface g0/1

restores the default settings of the interface selected.

SW1(co­nfig)#clear mac addres­s-table dynamic

manually removes the MAC address from the table.

SW1(co­nfig)#clear mac addres­s-table dynamic interface interface

deletes all mac address on an interface.

R1(con­fig­-if)#ip address 192.16­8.1.1 255.25­5.255.0

sets the chosen interface with an IP address and Subnet Mask

R1(con­fig)#hostname R1

sets a hostname to a chosen network device.

SW1(co­nfi­g-if)#speed 10,100­,1000 or auto

sets the chosen interface speed settings.

R1(con­fig)#ip route | destin­ation of the network's ip address | destin­ation of the network's Subnet Mask | next hop router

sets a static configured route of the next hop address with destin­ation and subnet­mask.

SW1(co­nfi­g-if)#vlan vlan number

creates the VLAN.

SW1(co­nfi­g-if)#switchport mode access

enables the VLAN on the selected interface.

SW1(co­nfi­g-if)#switchport mode trunk

sets the switchport to trunking mode.

SW1(co­nfi­g-if)#switchport trunk allowed vlan vlan number

adds VLANs to the config­ure­d/s­elected trunk

SW1#show interfaces trunk

displays the native VLAN number and the allowed VLAN on a trunk

R1(con­fig­-if)#interface g0/1

STEP #1- select a sub-in­ter­face.

R1(con­fig­-su­bif)#ip address 192.16­8.1.62 255.25­5.2­55.192

STEP #3 - configure the sub-in­terface with an IP address and subnet­mask.

R1#show ip route

we can view those sub-in­ter­faces with these commands

MLSW1(­con­fig)#ip routing

enables Layer 3 routing on the MLSW.

SW1(co­nfi­g-if)#interface vlan vlan number*

STEP 1# select a VLAN to configure an SVI on.

SW1(co­nfi­g-if)#no shutdown

STEP 3# enable the SVI interface.

SW2(co­nfi­g-if)#switchport mode dynamic auto/d­esi­rable

this is DTP. automa­tically determ­ining if the switchport needs to be access­-access or trunk-­trunk.

SW2#show interfaces g0/1 switchport

displays the following; interface name, admini­str­ative mode (desir­abl­e/a­uto), operat­ional mode (trunk­/ac­cess).

SW1(co­nfig)#vtp domain domain name

changes domain name from "­NUL­L" to a configured domain name. *note: can't delete vtp domain name. only change to a diffreenet VTP domain name or delete the .dat file on the Switch.

SW1(co­nfig)#vtp version version number 1,2,3

selects the version number. *note: for a server switch to share VTP advert­ise­ments and copy it's VLANs and revision number and domain name to other client switches. they both need to be set to the same version number.

MLSW(c­onfig)#interface po1

#STEP 1 - creates port channel interface

MLSW(c­onf­ig-if)#switchport mode trunk

#STEP 3 - sets the port channel to trunk mode

SW(con­fig)#interface po1

#STEP 1 - creates port channel interface

SW(con­fig­-if)#switchport mode trunk

#STEP 3 - sets the port channel to trunk mode

MLSW(c­onfig)#interface range g0/1-5

STEP #1 - select interfaces

MLSW(c­onfig)#channe­l-group 1,2,3 mode active / desirable / on*

STEP #3 - *creates the po1 interface and sets the channel group and EtherC­hannel Protocol.

SW1#show etherc­hannel summary

displays the flags | (SU) (SD) (RU) etc...

SW1#show etherc­hannel port-c­hannel

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