According to paragraph 7, why will people move away from the coastlines in the future?
A.It will be too warm for them to live there.
B.The coastlines will have too much vegetation.
C.Flooding will destroy the coastal areas.
D.No agricultural crops will be grown on the coasts.
第1题
A.[Quidway-interface-vlan1]igmp enable用于使能IGMP协议;
B.[Quidway-vlan1]igmp enable用于使能IGMP协议;
C.[Quidway-interface-vlan1]igmp-snooping enable用于使能IGMP snooping;
D.[Quidway]igmp-snooping enable用于使能IGMP snooping。
第2题
A.IGMP Snooping解决组播报文在三层广播的问题
B.IGMP Snooping运行在链路层,是二层以太网交换机上的组播约束机制,用于管理和控制组播组
C.IGMP Snooping通过在监听主机发出的IGMP报文,建立MAC组播地址表
D.IGMP Snooping不会消耗交换机的CPU
第3题
A、IGMP Snooping(Internet Group Management Protocol Snooping)是运行在二层以太网交换机上的组播约束机制,用于管理和控制组播组
B、IGMP Snooping运行在链路层
C、没有运行IGMP Snooping时,组播报文将在二层广播
D、以上说法全部错误
第4题
B、IGMP Snooping运行在链路层
C、没有运行IGMP Snooping时,组播报文将在二层播送
D、以上说法全部错误
第5题
A.如果主机发出IGMP离开报文时,交换机将改主机加入到相应的组播表中
B.如果主机发出的IGMP主机报告报文时,交换机将删除与该主机对应的组播表项
C.二层交换机通过不断监听IGMP报文,交换机在二层建立和维护MAC广播地址表
D.没有运行IGMP Snooping时,组播报文将在二层广播,运行IGMP Snooping后,报文将不再二层广播,而是进行二层组播
第6题
A. IGMP snooping and Cisco Group Membership Protocol (CGMP) can be used simultaneously on a switch.
B. IGMP snooping a nd Cisco Group Membership Protocol (CGMP) were developed to help Layer 3 switches make intelligent forwarding decisions on their own.
C. IGMP snooping examines IGMP join/leave messages so that multicast traffic is forwarded only to hosts that sent an IG MP message toward the router.
D. IGMP snooping is an IP multicast constraining mechanism for Layer 2 switches.
E. IGMP snooping is enabled with the ip multicast - routing global configuration command.
第7题
A.组播不通
B.组播正常,但IGMP Snooping无法正确记录成员端口信息
C.组播正常,IGMP Snooping也可以正确记录组播成员端口信息
D.如果同时启用IGMP Spoofing,可以使IGMP Snooping正常工作
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