A.1

B.2

C.4

D.3

A.2

B.6

C.1

D.17

A.150.25.1.255

B.150.25.0.0

C.150.15.3.30

D.150.25.2.24

A.Heavy workload and difficult to manage

B.When the configuration information changes (such as DNS), only the administrator needs to modify it on the DHCP server to facilitate unified management

C.Reuse of IP address can be realized

D.Avoid IP address conflicts

A.When calling ACL under the interface, it can only be applied to the outbound direction

B.ACL can match the TCP/UDP port number of the message, and can specify the range of port numbers

C.When ACL defines rules, it can only proceed in the order of 10, 20, and 30

D.The same ACL can be called under multiple interfaces

E.ACL cannot be used to filter OSPF traffic, because OSPF traffic does not use UDP protocol encapsulation