2. 计算机
  3. A　multicast　router　may　receive　thousands　of　multicast(71)every　day　for　different　groups.　If　a　router　has　no　knowledge　about　the　

A　multicast　router　may　receive　thousands　of　multicast(71)every　day　for　different　groups.　If　a　router　has　no　knowledge　about　the　

admin2009-05-15  26
问题 A　multicast　router　may　receive　thousands　of　multicast(71)every　day　for　different　groups.　If　a　router　has　no　knowledge　about　the　membership　status　of　the(72),　it　must　broadcast　all　of　these　packets.　This　creates　a　lot　of　traffic　and　consumes(73).　A　better　solution　is　to　keep　a　list　of　groups　in　the　network　for　which　there　is　at　least　one　loyal　member.(74)helps　the　multicast　router　create　and　update　this　list.　For　each　group,　there　is　one　router　that　has　the　duty　of　distributing　the(75)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.
选项 A、anycast
B、multicast
C、unicast
D、broadcast
答案B
解析
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