单选题To which of these does IP multicast send packets?（）Aa single hostBa subset of hostsCall hosts sequentiallyDall hosts simultaneously
单选题
To which of these does IP multicast send packets?（）
A
a single host
B
a subset of hosts
C
all hosts sequentially
D
all hosts simultaneously
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问答题In a run sparse-dense-mode multicast network， when rendezvous point down ， will the recipient receive the packets send by the source？why？