网络管理员在交换机1上创建一个新VLAN并且将主机C和主机D加入到此VLAN中。管理员配置交换机接口FastEthernet0/13到FastEthernet0/24成为新VLAN成员.但是网络管理员完成配置以后，主机A可以和主机B通信，但是主机A不能和主机C或者主机D通信。哪个命令可以用来解决这个问题？（）

A.Only passwords configured after the command has been entered will beencrypted.
B.Only the enable password will be encrypted.
C.Only the enable secret password will beencrypted
D.It will encrypt the secret password and remove the enable secret password from the configuration.
E.It will encrypt all current and future passwords.

A.Security increases because only the network administrator may change the routing tables.
B.Configuration complexity decreases as network size increases.
C.Routing updates are automatically sent to neighbors.
D.Route summarization is compued automatically by the router.
E.Routing traffic load is reduced when used in stub network links.
F.An efficient algorithm is used to build routing tables，using automatic updates.
G.Routing tables adapt automatically to topology changes.

A.ping
B.Telnet
C.FTP
D.TCP
E.IP