routers are configured shutdown in default
switches are configured no shutdown in default which is they are up and running
full duplex if the device is capable of receiving data and sending data at the same time
or half duplex which is not
a means auto
show interface status
con f
speed ?
speed 100
duplex ?
duplex full
desc
interface range f0/5 - 12
desc ## not in use ##
shutdown
interface range f0/5 - 6, f0/9 - 12
no shutdown / no shut
This is autonegatiation enabled
This is autonegatiation disabled
en
conf t
int g0/0
ip add 172.16.255.254 255.255.0.0
# 1000 since its a gigabit
speed 1000
duplex full
no shut
int range g0/1 - 2
desc ## not in use ##
copy running-config startup-config
en
conf t
hostname SW1
This just works in switches not in routers
do show interface status
SW1 - interface g0/1
int g0/1
speed 1000
duplex 1000
desc ## to R1 ##
SW1 - interface g0/2
int g0/2
speed 1000
duplex full
desc ## to SW2 ##
SW1 - interface f0/3 - 24
int range f0/3 - 24
desc ## not in use ##
do show interface status
Just shutdown the interfaces that is not in use
int range f0/3 - 24
shutdown
do show interface status
Add description to interface f0/1 - 2
int range f0/1 - 2
desc ## to end hosts ##
do show interface status
SAVE THE CHANGES
copy running-config startup-config
SWITCH 22222222222222222222222
SW 2 - interface g0/1
int g0/1
speed 1000
duplex full
desc ## to SW1 ##
checking the status
do show interface status
SW 2 - interface g0/2
THE G0/2 interface is connected to nothing
int g0/2
speed 1000
duplex full
desc ## to nothing ##
int range f0/1 - 2
desc ## to end host ##
do show interface status
Shut down the other interfaces
int range f0/3 - 24
shutdown
See the changes
do show interface status
Save the changes
copy running-config startup-config
