單項選擇題You are working in a data center environment and are assigned the address range 10.188.31.0/23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?（）

A.10.188.31.0/27
B.10.188.31.0/26
C.10.188.31.0/29
D.10.188.31.0/28
E.10.188.31.0/25


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3.單項選擇題You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the max number of subnets.Which network address and subnet mask meet this requirement?（）

A.192.168.252.8 255.255.255.248
B.192.168.252.8 255.255.255.252
C.192.168.252.16 255.255.255.240
D.192.168.252.0 255.255.255.252
E.192.168.252.16 255.255.255.252

4.單項選擇題Which command encrypts all plaintext passwords?（）

A.Router(config)#password-encryption
B.Router(config)#service password-encryption
C.Router#service password-encryption
D.Router# password-encryption

5.單項選擇題Which command enables IPv6 forwarding on a cisco router?（）

A.ipv6 host
B.ipv6 unicast-routing
C.ipv6 local
D.ipv6 neighbor