简述组播的sparse和dense的区别。

【参考答案】

dense mode ：
implicit joins，use flo......

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相关考题

单项选择题

Which standard supports multiple instances of spanning tree？（）

A.802.1D
B.802.1s
C.802.1w
D.802.1z

多项选择题

Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）

A.Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.
B.UDLD protects against STP failures caused by cabling problems that create one-way links.
C.Loop guard detects and protects against duplicate packets being received and transmitted on different ports.
D.UDLD protects against unidirectional cabling problems on copper and fiber media.
E.Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

问答题

what’s IOS command ， you can see the output as below