Refer to the exhibit.
A new Nexus device, Router-B, was recently added to the network. The engineer wants to make
Router-B the designated IGMP querier for this network. Which two configurations should be
applied to the devices on the network to accomplish this goal? (Choose two.)
A.
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip address 10.1.1.251 255.255.255.0
B.
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip address 10.1.1.249 255.255.255.0
Router-B(config)# feature igmp
C.
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip igmp version 2
Router-B(config)# feature igmp
D.
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip igmp querier
Router-B(config)# feature pim
E.
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip pim sparse-mode
Options are not aligned correctly. I think it should be like this:
A.
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip address 10.1.1.251 255.255.255.0
B.
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip address 10.1.1.249 255.255.255.0
C.
Router-B(config)# feature igmp
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip igmp version 2
D.
Router-B(config)# feature igmp
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip igmp querier
E.
Router-B(config)# feature pim
Router-B(config)# interface Ethernet1/1
Router-B(config-if)# ip pim sparse-mode
And I would answer A, E. Designated forwarder is the highest IP on the subnet (in case of priority equality) so you need to address new router .251 and not .249.
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A correction to my thoughts. Designated forwarder is not IGMP querier. By default, the lowest IP address router (per RFC 2236) will be the IGMP querier. On the other hand, the highest IP address router (per RFC 2362) will be the PIM DR. Therefore B, E is the right answer.
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