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A multicast router may receive thousands

考试题库2022-08-02  111
问题 A multicast router may receive thousands of multicast（）every day for different groups. If a router has no knowledge about the membership status of the（）， it must broadcast all of these packets. This creates a lot of traffic and consumes（）. A better solution is to keep a list of groups in the network for which there is at least one loyal member.（）helps the multicast router create and update this list. For each group， there is one router that has the duty of distributing the（）packets destined for that group. This means that if there are three multicast routers connected to a network， their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.A.routersB.networkC.packetsD.hosts
选项 A.routers
B.network
C.packets
D.hosts
答案 D
解析 一个多播路由器每天可能会收到来自不同的工作组发送过来的大量多播数据包，如果路由器没有关于主机中的成员状态的知识，它就需要广播所有这些数据包，这样，就会产生拥塞，消耗带宽。最好的解决方法是保持一个网络中组用户列表，其中至少有一个核心成员。IGMP帮助多播路由器创建并更新这个列表。对于每一个组，都有一个路由器负责分配多播数据包流向该组。这就意味着如果有三个多播路由器连接成一个网络，它们的组列表是专有的，一台主机或多播路由器能在组中拥有会员资格。
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软件水平考试初中高级

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