When I review the lab today，I experienced the odd number and even of subnet。I think everybody maybe use it in fact，So I introduce it now for everyone：

        It is actually simple ，use "254"mask（0.254.255.255；0.0.254.255；0.0.0.254 of course ,you should know witch class of network address do you want to match）and 1 or 0.both of them be used to complete the worke.

        For instance ：192.168.0.0/24；192.168.1.0/24；192.168.2.0/24；192.168.3.0/24；192.168.4.0/24；192.168.5.0/24……

        Now We  only allow the even subnet to be match ，So We need to do this：

        Access-list 1 permit 192.168.0.0 0.0.254.255 or access-list 1 deny 192.168.1.0 0.0.254.255

 

       The second instance：10.0.1.0/16；10.1.1.0/16；10.2.1.0/16；10.3.1.0/16；10.4.1.0/16；10.5.1.0/16；……Now We only allow odd number of subnet  to be match，So We should to do like this：

       access-list 1 permit 10.1.1.0 0.254.255.255 or access-list 1 deny 10.0.1.0 0.254.255.255

      Another ones look like as above，Everyone need to do it by yourself。