S8505支持的igmp snooping与igmp proxy有什么区别？

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第1题：

Which two statements are true about Internet Group Management Protocol (IGMP) snooping?()

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.

参考答案：C, D

第2题：

关于IGMP snooping描述正确的是()

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

参考答案：B, C

第3题：

在一个只有二层交换机构成的局域网中,如果在交换机上只启用IGMP Snooping,那么()。

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

答案A

第4题：

Which three statements are true about the Internet Group Management Protocol (IGMP)? （）

A、There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode
B、IGMP is used to register individual hosts with a multicast group
C、IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from
D、IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1
E、IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP
F、IGMP snooping ru ns on Layer 3 routers

正确答案:B,C,D

第5题：

请简述7360组播代理(IGMP Proxy)的工作原理

正确答案:答题要点：1.7360 OLT支持IGMP Proxy 2.OLT负责组播源的管理和复制 3.OLT负责组播用户的管理和维护 4.OLT采用跨VLAN的组播模式

第6题：

Which three statements are true about the Internet Group Management Protocol (IGMP)? ()

A. There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode

B. IGMP is used to register individual hosts with a multicast group

C. IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from

D. IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1

E. IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP

F. IGMP snooping ru ns on Layer 3 routers

参考答案：B, C, D

第7题：

在分布式IGMP组播模式下，ONU的工作模式为？

A、IGMP Proxy；
B、IGMP Snooping；
C、透传；
D、丢弃。

正确答案:B

第8题：

对于既支持IGMP同时也支持IGMP snooping的Quidway交换机,下列关于二者配置描述正确的有()。

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。

答案：AD

第9题：

7302上可以做组播，此时LT板所起的作用是

A、multicast source
B、IGMP client
C、IGMP snooping
D、IGMP Proxy

正确答案:D

第10题：

Nexus# sh ip igmp snooping vlan 120 IGMP Snooping information for vlan 120 IGMP snooping disabled Optimised Multicast Flood （OMF） disabled IGMP querier none Switch-querier enabled， address 1.1.1.1， currently not running IGMPv3 Explicit tracking enabled IGMPv2 Fast leave disabled IGMPv1/v2 Report suppression enabled IGMPv3 Report suppression disabled Link Local Groups suppression enabled Router port detection using PIM Hellos， IGMP Queries Number of router-ports： 0 Number of groups： 0 Active ports： Po100 Po111 Which statement best describes what is depicted in the show command output？（）

A、 IGMP snooping is not active for VLAN 120 because the IGMP feature has not been enabled on the switch with the feature igmp command.
B、 The IGMP snooping querier for VLAN 120 is not in a running state because the Loopback interface configured with 1.1.1.1/32 is currently in a down state.
C、 IGMP snooping has been disabled on the VLAN 120 SVI.
D、 IGMP snooping has been disabled for VLAN 120 in VLAN configuration mode.
E、 IGMP snooping is not active for VLAN 120 because VLAN 120 does not exist in the VLAN database.

正确答案:D

S8505支持的igmp snooping与igmp proxy

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