• R1

configure terminal
!
interface FastEthernet 0/0
 ip address 192.168.0.1 255.255.255.0
 no shutdown
exit
!
end

• R2

configure terminal
!
interface FastEthernet 0/0
 ip address 192.168.0.2 255.255.255.0
 no shutdown
exit
!
end

• SW3

configure terminal
!
interface Vlan 1
 ip address 192.168.0.103 255.255.255.0
 no shutdown
exit
!
end

• SW4

configure terminal
!
interface range FastEthernet 1/0/1 - 2
 switchport protected
 switchport block multicast
 switchport block unicast
exit
!
end

• SW4

SW4#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
SW4(config)#inter
SW4(config)#int range f1/0/1 -2
SW4(config-if-range)#swi
SW4(config-if-range)#switchport pro
SW4(config-if-range)#switchport protected 
SW4(config-if-range)#no swi               
SW4(config-if-range)#no switchport pr
SW4(config-if-range)#no switchport pro
SW4(config-if-range)#no switchport protected 
SW4(config-if-range)#no switchport protected 
SW4(config-if-range)#swi                     
SW4(config-if-range)#switchport pro
SW4(config-if-range)#switchport protected 
SW4(config-if-range)#exit
SW4(config)#int f1/0/1
SW4(config-if)#swi
SW4(config-if)#switchport bl
SW4(config-if)#switchport block mu
SW4(config-if)#switchport block multicast 
SW4(config-if)#swi
SW4(config-if)#switchport blo
SW4(config-if)#switchport block u
SW4(config-if)#switchport block unicast 
SW4(config-if)#do sh run int f1/0/1
Building configuration...

Current configuration : 111 bytes
!
interface FastEthernet1/0/1
 switchport protected
 switchport block multicast
 switchport block unicast
end

SW4(config-if)#do sh run int f1/0/2
Building configuration...

Current configuration : 57 bytes
!
interface FastEthernet1/0/2
 switchport protected
end

SW4(config-if)#