多项选择题

WhichofthefollowingstatementsconcerningIGMParecorrect？（……

Which of the following statements concerning IGMP are correct？（Choose all that apply.）（）

A.With IGMPvl， queries are sent to a specific group
B.Hosts issuing IGMPvl requests will be correctly interpreted by IGMPv2 hosts due to backwardcompatibility
C.An IGMPv2 router will ignore IGMPv2 leave messages when IGMFVl hosts are present
D.With IGMFV2， a leave message is supported
E.An IGMPv2 host will send an IGMFVl report on an IGMFVl router
F.An IGMPv2 router can only allow IGMPv2 hosts to execute a join request

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多项选择题Whichofthefollowingpiecesofinformationwillthecommandshowinterfaceprovide？（Chooseallthatapply.）（）

A.Layer 1 status
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D.Cable type connected to interface
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A.show crypto map ipsec sa
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C.show crypto engine connections active
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A.configure archive running-config
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单项选择题Inwhatsituationwouldthecommandiphelper-addressberequired？（Choosethebestanswer.）（）

A.Only when there is a duplicate IP address caused by a combination of static and dynamic IPaddress allocations
B.On each router that exists between the client and the server
C.Only when a router separates the client from the server
D.Only if the DHCP sever issues a DHCPNAK to the initial request
E.Only when the client is on the same subnet as the server
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