R:
hostname R
interface FastEthernet0/0
 ip address 192.168.11.1 255.255.255.0
no shut

interface FastEthernet0/1
 ip address 192.168.22.1 255.255.255.0
no shut

ip route 192.168.2.0 255.255.255.0 192.168.11.2 
ip route 192.168.3.0 255.255.255.0 192.168.11.2 
ip route 192.168.4.0 255.255.255.0 192.168.22.2 
ip route 192.168.5.0 255.255.255.0 192.168.22.2 
S1:
hostname S1
ip routing
interface FastEthernet0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
no shut
interface FastEthernet0/2
 switchport trunk encapsulation dot1q
 switchport mode trunk
no shut
interface FastEthernet0/3
 no switchport
 ip address 192.168.11.2 255.255.255.0
no shut
ip route 0.0.0.0 0.0.0.0 192.168.11.1
vlan 2
vlan 3
int vlan 2
ip ad 192.168.2.1 255.255.255.0
int valn 3
ip ad 192.168.3.1 255.255.255.0


S2:
hostname S2
ip routing
interface FastEthernet0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
no shut
interface FastEthernet0/2
 switchport trunk encapsulation dot1q
 switchport mode trunk
no shut
interface FastEthernet0/3
 no switchport
 ip address 192.168.22.2 255.255.255.0
no shut
ip route 0.0.0.0 0.0.0.0 192.168.22.1
vlan 4
valn 5
int vlan 4
ip ad 192.168.4.1 255.255.255.0
int vlan 5
ip ad 192.168.5.1 255.255.255.0

S11:
hostname S11
vlan 2
vlan 3
interface FastEthernet0/1
 switchport access vlan 2
!
interface FastEthernet0/2
 switchport access vlan 3
!
interface FastEthernet0/3
 switchport mode trunk

S12：
hostname S12
vlan 2
vlan 3
interface FastEthernet0/1
 switchport access vlan 2
!
interface FastEthernet0/2
 switchport access vlan 3
!
interface FastEthernet0/3
 switchport mode trunk

S21:
hostname S21
vlan  4
interface FastEthernet0/1
switchport access vlan 4
!
S22:
hostname S22
vlan  5
interface FastEthernet0/1
switchport access vlan 5

课后习题