單項選擇題If an ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet（）。

A.1024
B.2046
C.4094
D.4096
E.8190


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1.多項選擇題Which two are features of IPv6?（）

A.multicast
B.broadcast
C.allcast
D.podcast
E.anycast

2.多項選擇題Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true? （）

A.Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.
B.Router C will use ICMP to inform Router B that Host 2 cannot be reached.
C.Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.
D.Router C will send a Destination Unreachable message type.
E.Router C will send a Router Selection message type.
F.Router C will send a Source Quench message type.

3.單項選擇題Which command enables RSTP on aswitch?（）

A.spanning-tree mode rapid-pvst
B.spanning-tree uplinkfast
C.spanning-tree backbonefast
D.spanning-tree mode mst

4.多項選擇題Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0？（）

A.113.10.4.0
B.186.54.3.0
C.175.33.3.255
D.26.35.2.255
E.17.35.36.0

5.單項選擇題When two hosts are trying to communicate across a network, how does the host originating thecommunication determine the hardware address of the host that it wants to "talk" to?（）

A.RARP request
B.Show Network Address request
C.Proxy ARP request
D.ARP request
E.Show Hardware Address request