en
conf t

do show vlan bri

vlan 10
 name admin
exit

!! create vlan 20 (HR) & vlan 30(sales)

int range fa 0/1 - 2
 switchport access vlan 10
exit

!! configure 0/3 - 4 in vlan 20
!! configure 0/5 - 6 in vlan 30

do show vlan bri

!! now add 1.4 pc to fa0/7 port
!! ping 1.2 -> 1.4 
!! change fa0/7 to vlan 10 and ping 1.2 -> 1.4