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what device sends IGMP Query messages？
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单选题A networking device that sends packets to all connections is a:（）A
gateway.B
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switch.D
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单选题Which enhancement w as added to IGMP version 3?（）A
membership query messageB
membership report messageC
leave group messageD
source filteringE
destination filtering
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单选题You have an Exchange Server 2010 organization. Your companys legal department sends compliance e-mail messages by adding recipients to the blindcarbon copy （Bcc） field. The companys compliance policy includes the following requirements： .All e-mail messages sent to external recipients must be archived in a central repository .Compliance officers must be able to identify all the recipients of archived e-mail messages You need recommend a solution to meet the compliance policy requirements. What should you recommend？（）A
journal rulesB
message trackingC
Personal ArchivesD
transport rules
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单选题Which process occurs first during the Ethernet Discovery Stage process for a PPPoE service offering?（）A
The ERX router sends an Active Discovery Off ermessage.B
The ERX router sendsan Active Discovery Initiation message.C
The customer device sends an Active Discovery Offer message.D
The customer device sends an Active Discovery Initiation message.
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单选题Which process occurs first during the Ethernet Discovery Stage process for a PPPoE service offering?（）A
The ERX router sends an Active Discovery Offer message.B
The ERX router sends an Active Discovery Initiation message.C
The customer device sends an Active Discovery Offer message.D
The customer device sends an Active Discovery Initiation message
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