答案:```
ip address 192.168.100.201 255.255.255.0
no shutdown
!
ip address 192.168.100.254 255.255.255.0
no shutdown
!
ip access-list extended BLOCK
deny ip 192.168.100.201 0.0.0.254 any
permit ip any any
!
interface GigabitEthernet0/0
ip access-group BLOCK in
!
```