Which IPv6 address is valid?（）……

单项选择题which address range efficiently summarizes the routing table of the addresses for router main?（）

A.172.16.0.0/18
B.172.16.0.0/16
C.172.16.0.0/20
D.172.16.0.0/21

多项选择题A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme?（）

A.255.255.255.0
B.255.255.255.128
C.255.255.252.0
D.255.255.255.224
E.255.255.255.192
F.255.255.248.0

多项选择题Which three are characteristics of an IPV6 anycast address?（）

A.any-to-many communication model
B.delivery of packets to the group interface that is closest to the sending device
C.one-to-many communication model
D.the same address for multiple devices in the group
E.one-to-nearest communication model
F.a unique IPV6 address for each device in the group

单项选择题Which option is a valid IPv6 address?（）

A.2001：0000：130F：：099a：：12a
B.2002：7654：A1AD：61：81AF：CCC1
C.FEC0：ABCD：WXYZ：0067：：2A4
D.2004：1：25A4：886F：：1

单项选择题Refer to the exhibit. In this VLSM addressing scheme, what summary address would be sent from routerA?（）

A.172.16.0.0/16
B.172.16.0.0/20
C.172.16.0.0/24
D.172.32.0.0/16
E.172.32.0.0/17
F.172.64.0.0/16