单项选择题
Which statement is true of a source that wants to transmit multicast traffic to group 239.1.1.1？（）
A.Before sending traffic, it must first join multicast group 239.1.1.1 by sending an IGMPv2 membership report to the default router on the local subnet.
B.It must send an IGMPv2 Request to Send packet and then wait for an IGMPv2 Clear to Send packet from the IGMPv2 querier router on the local subnet
C.It may begin transmitting multicast traffic to the group only when there is no other host transmitting to the group on the local subnet.
D.It may transmit multicast traffic to the group at any time.
相关考题
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单项选择题
WhenaBGProuterisnotcapableofunderstanding4-byteASnumbers，itwillsee4-byteASnumbersasaspecial，reserved，2-byteASnumberintheASpath.Which2-byteASnumberisthisreservedone？（）
A.00000
B.12345
C.23456
D.65000
E.99999 -
单项选择题
WhatistheSTProotguardfeaturedesignedtoprevent？（）
A.a root port being transitioned to the blocking state
B.a port being assigned as a root port
C.a port being assigned as an alternate port
D.a root port being transitioned to the forwarding state -
单项选择题
IEEE802.1wisaRapidSpanningTreeProtocol（RSTP）thatcanbeseenasanevolutionofthe802.1standard.Whataretheportrolesdescribedby802.1w？（）
A.root port，designated port，alternate port，backup port，and disabled
B.standby port，alternate port，root port，and disabled
C.standby port，designated port，backup port，and disabled
D.root port，designated port，alternate port，and standby port
